[lhc/web/wiklou.git] / resources / lib / qunitjs / qunit.js

/*!
 * QUnit 2.6.0
 * https://qunitjs.com/
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license
 * https://jquery.org/license
 *
 * Date: 2018-03-27T02:18Z
 */
(function (global$1) {
  'use strict';

  global$1 = global$1 && global$1.hasOwnProperty('default') ? global$1['default'] : global$1;

  var window = global$1.window;
  var self$1 = global$1.self;
  var console = global$1.console;
  var setTimeout = global$1.setTimeout;
  var clearTimeout = global$1.clearTimeout;

  var document = window && window.document;
  var navigator = window && window.navigator;

  var localSessionStorage = function () {
        var x = "qunit-test-string";
        try {
                global$1.sessionStorage.setItem(x, x);
                global$1.sessionStorage.removeItem(x);
                return global$1.sessionStorage;
        } catch (e) {
                return undefined;
        }
  }();

  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
    return typeof obj;
  } : function (obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
  };











  var classCallCheck = function (instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  };

  var createClass = function () {
    function defineProperties(target, props) {
      for (var i = 0; i < props.length; i++) {
        var descriptor = props[i];
        descriptor.enumerable = descriptor.enumerable || false;
        descriptor.configurable = true;
        if ("value" in descriptor) descriptor.writable = true;
        Object.defineProperty(target, descriptor.key, descriptor);
      }
    }

    return function (Constructor, protoProps, staticProps) {
      if (protoProps) defineProperties(Constructor.prototype, protoProps);
      if (staticProps) defineProperties(Constructor, staticProps);
      return Constructor;
    };
  }();









































  var toConsumableArray = function (arr) {
    if (Array.isArray(arr)) {
      for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];

      return arr2;
    } else {
      return Array.from(arr);
    }
  };

  var toString = Object.prototype.toString;
  var hasOwn = Object.prototype.hasOwnProperty;
  var now = Date.now || function () {
        return new Date().getTime();
  };

  var defined = {
        document: window && window.document !== undefined,
        setTimeout: setTimeout !== undefined
  };

  // Returns a new Array with the elements that are in a but not in b
  function diff(a, b) {
        var i,
            j,
            result = a.slice();

        for (i = 0; i < result.length; i++) {
                for (j = 0; j < b.length; j++) {
                        if (result[i] === b[j]) {
                                result.splice(i, 1);
                                i--;
                                break;
                        }
                }
        }
        return result;
  }

  /**
   * Determines whether an element exists in a given array or not.
   *
   * @method inArray
   * @param {Any} elem
   * @param {Array} array
   * @return {Boolean}
   */
  function inArray(elem, array) {
        return array.indexOf(elem) !== -1;
  }

  /**
   * Makes a clone of an object using only Array or Object as base,
   * and copies over the own enumerable properties.
   *
   * @param {Object} obj
   * @return {Object} New object with only the own properties (recursively).
   */
  function objectValues(obj) {
        var key,
            val,
            vals = is("array", obj) ? [] : {};
        for (key in obj) {
                if (hasOwn.call(obj, key)) {
                        val = obj[key];
                        vals[key] = val === Object(val) ? objectValues(val) : val;
                }
        }
        return vals;
  }

  function extend(a, b, undefOnly) {
        for (var prop in b) {
                if (hasOwn.call(b, prop)) {
                        if (b[prop] === undefined) {
                                delete a[prop];
                        } else if (!(undefOnly && typeof a[prop] !== "undefined")) {
                                a[prop] = b[prop];
                        }
                }
        }

        return a;
  }

  function objectType(obj) {
        if (typeof obj === "undefined") {
                return "undefined";
        }

        // Consider: typeof null === object
        if (obj === null) {
                return "null";
        }

        var match = toString.call(obj).match(/^\[object\s(.*)\]$/),
            type = match && match[1];

        switch (type) {
                case "Number":
                        if (isNaN(obj)) {
                                return "nan";
                        }
                        return "number";
                case "String":
                case "Boolean":
                case "Array":
                case "Set":
                case "Map":
                case "Date":
                case "RegExp":
                case "Function":
                case "Symbol":
                        return type.toLowerCase();
                default:
                        return typeof obj === "undefined" ? "undefined" : _typeof(obj);
        }
  }

  // Safe object type checking
  function is(type, obj) {
        return objectType(obj) === type;
  }

  // Based on Java's String.hashCode, a simple but not
  // rigorously collision resistant hashing function
  function generateHash(module, testName) {
        var str = module + "\x1C" + testName;
        var hash = 0;

        for (var i = 0; i < str.length; i++) {
                hash = (hash << 5) - hash + str.charCodeAt(i);
                hash |= 0;
        }

        // Convert the possibly negative integer hash code into an 8 character hex string, which isn't
        // strictly necessary but increases user understanding that the id is a SHA-like hash
        var hex = (0x100000000 + hash).toString(16);
        if (hex.length < 8) {
                hex = "0000000" + hex;
        }

        return hex.slice(-8);
  }

  // Test for equality any JavaScript type.
  // Authors: Philippe Rathé <prathe@gmail.com>, David Chan <david@troi.org>
  var equiv = (function () {

        // Value pairs queued for comparison. Used for breadth-first processing order, recursion
        // detection and avoiding repeated comparison (see below for details).
        // Elements are { a: val, b: val }.
        var pairs = [];

        var getProto = Object.getPrototypeOf || function (obj) {
                return obj.__proto__;
        };

        function useStrictEquality(a, b) {

                // This only gets called if a and b are not strict equal, and is used to compare on
                // the primitive values inside object wrappers. For example:
                // `var i = 1;`
                // `var j = new Number(1);`
                // Neither a nor b can be null, as a !== b and they have the same type.
                if ((typeof a === "undefined" ? "undefined" : _typeof(a)) === "object") {
                        a = a.valueOf();
                }
                if ((typeof b === "undefined" ? "undefined" : _typeof(b)) === "object") {
                        b = b.valueOf();
                }

                return a === b;
        }

        function compareConstructors(a, b) {
                var protoA = getProto(a);
                var protoB = getProto(b);

                // Comparing constructors is more strict than using `instanceof`
                if (a.constructor === b.constructor) {
                        return true;
                }

                // Ref #851
                // If the obj prototype descends from a null constructor, treat it
                // as a null prototype.
                if (protoA && protoA.constructor === null) {
                        protoA = null;
                }
                if (protoB && protoB.constructor === null) {
                        protoB = null;
                }

                // Allow objects with no prototype to be equivalent to
                // objects with Object as their constructor.
                if (protoA === null && protoB === Object.prototype || protoB === null && protoA === Object.prototype) {
                        return true;
                }

                return false;
        }

        function getRegExpFlags(regexp) {
                return "flags" in regexp ? regexp.flags : regexp.toString().match(/[gimuy]*$/)[0];
        }

        function isContainer(val) {
                return ["object", "array", "map", "set"].indexOf(objectType(val)) !== -1;
        }

        function breadthFirstCompareChild(a, b) {

                // If a is a container not reference-equal to b, postpone the comparison to the
                // end of the pairs queue -- unless (a, b) has been seen before, in which case skip
                // over the pair.
                if (a === b) {
                        return true;
                }
                if (!isContainer(a)) {
                        return typeEquiv(a, b);
                }
                if (pairs.every(function (pair) {
                        return pair.a !== a || pair.b !== b;
                })) {

                        // Not yet started comparing this pair
                        pairs.push({ a: a, b: b });
                }
                return true;
        }

        var callbacks = {
                "string": useStrictEquality,
                "boolean": useStrictEquality,
                "number": useStrictEquality,
                "null": useStrictEquality,
                "undefined": useStrictEquality,
                "symbol": useStrictEquality,
                "date": useStrictEquality,

                "nan": function nan() {
                        return true;
                },

                "regexp": function regexp(a, b) {
                        return a.source === b.source &&

                        // Include flags in the comparison
                        getRegExpFlags(a) === getRegExpFlags(b);
                },

                // abort (identical references / instance methods were skipped earlier)
                "function": function _function() {
                        return false;
                },

                "array": function array(a, b) {
                        var i, len;

                        len = a.length;
                        if (len !== b.length) {

                                // Safe and faster
                                return false;
                        }

                        for (i = 0; i < len; i++) {

                                // Compare non-containers; queue non-reference-equal containers
                                if (!breadthFirstCompareChild(a[i], b[i])) {
                                        return false;
                                }
                        }
                        return true;
                },

                // Define sets a and b to be equivalent if for each element aVal in a, there
                // is some element bVal in b such that aVal and bVal are equivalent. Element
                // repetitions are not counted, so these are equivalent:
                // a = new Set( [ {}, [], [] ] );
                // b = new Set( [ {}, {}, [] ] );
                "set": function set$$1(a, b) {
                        var innerEq,
                            outerEq = true;

                        if (a.size !== b.size) {

                                // This optimization has certain quirks because of the lack of
                                // repetition counting. For instance, adding the same
                                // (reference-identical) element to two equivalent sets can
                                // make them non-equivalent.
                                return false;
                        }

                        a.forEach(function (aVal) {

                                // Short-circuit if the result is already known. (Using for...of
                                // with a break clause would be cleaner here, but it would cause
                                // a syntax error on older Javascript implementations even if
                                // Set is unused)
                                if (!outerEq) {
                                        return;
                                }

                                innerEq = false;

                                b.forEach(function (bVal) {
                                        var parentPairs;

                                        // Likewise, short-circuit if the result is already known
                                        if (innerEq) {
                                                return;
                                        }

                                        // Swap out the global pairs list, as the nested call to
                                        // innerEquiv will clobber its contents
                                        parentPairs = pairs;
                                        if (innerEquiv(bVal, aVal)) {
                                                innerEq = true;
                                        }

                                        // Replace the global pairs list
                                        pairs = parentPairs;
                                });

                                if (!innerEq) {
                                        outerEq = false;
                                }
                        });

                        return outerEq;
                },

                // Define maps a and b to be equivalent if for each key-value pair (aKey, aVal)
                // in a, there is some key-value pair (bKey, bVal) in b such that
                // [ aKey, aVal ] and [ bKey, bVal ] are equivalent. Key repetitions are not
                // counted, so these are equivalent:
                // a = new Map( [ [ {}, 1 ], [ {}, 1 ], [ [], 1 ] ] );
                // b = new Map( [ [ {}, 1 ], [ [], 1 ], [ [], 1 ] ] );
                "map": function map(a, b) {
                        var innerEq,
                            outerEq = true;

                        if (a.size !== b.size) {

                                // This optimization has certain quirks because of the lack of
                                // repetition counting. For instance, adding the same
                                // (reference-identical) key-value pair to two equivalent maps
                                // can make them non-equivalent.
                                return false;
                        }

                        a.forEach(function (aVal, aKey) {

                                // Short-circuit if the result is already known. (Using for...of
                                // with a break clause would be cleaner here, but it would cause
                                // a syntax error on older Javascript implementations even if
                                // Map is unused)
                                if (!outerEq) {
                                        return;
                                }

                                innerEq = false;

                                b.forEach(function (bVal, bKey) {
                                        var parentPairs;

                                        // Likewise, short-circuit if the result is already known
                                        if (innerEq) {
                                                return;
                                        }

                                        // Swap out the global pairs list, as the nested call to
                                        // innerEquiv will clobber its contents
                                        parentPairs = pairs;
                                        if (innerEquiv([bVal, bKey], [aVal, aKey])) {
                                                innerEq = true;
                                        }

                                        // Replace the global pairs list
                                        pairs = parentPairs;
                                });

                                if (!innerEq) {
                                        outerEq = false;
                                }
                        });

                        return outerEq;
                },

                "object": function object(a, b) {
                        var i,
                            aProperties = [],
                            bProperties = [];

                        if (compareConstructors(a, b) === false) {
                                return false;
                        }

                        // Be strict: don't ensure hasOwnProperty and go deep
                        for (i in a) {

                                // Collect a's properties
                                aProperties.push(i);

                                // Skip OOP methods that look the same
                                if (a.constructor !== Object && typeof a.constructor !== "undefined" && typeof a[i] === "function" && typeof b[i] === "function" && a[i].toString() === b[i].toString()) {
                                        continue;
                                }

                                // Compare non-containers; queue non-reference-equal containers
                                if (!breadthFirstCompareChild(a[i], b[i])) {
                                        return false;
                                }
                        }

                        for (i in b) {

                                // Collect b's properties
                                bProperties.push(i);
                        }

                        // Ensures identical properties name
                        return typeEquiv(aProperties.sort(), bProperties.sort());
                }
        };

        function typeEquiv(a, b) {
                var type = objectType(a);

                // Callbacks for containers will append to the pairs queue to achieve breadth-first
                // search order. The pairs queue is also used to avoid reprocessing any pair of
                // containers that are reference-equal to a previously visited pair (a special case
                // this being recursion detection).
                //
                // Because of this approach, once typeEquiv returns a false value, it should not be
                // called again without clearing the pair queue else it may wrongly report a visited
                // pair as being equivalent.
                return objectType(b) === type && callbacks[type](a, b);
        }

        function innerEquiv(a, b) {
                var i, pair;

                // We're done when there's nothing more to compare
                if (arguments.length < 2) {
                        return true;
                }

                // Clear the global pair queue and add the top-level values being compared
                pairs = [{ a: a, b: b }];

                for (i = 0; i < pairs.length; i++) {
                        pair = pairs[i];

                        // Perform type-specific comparison on any pairs that are not strictly
                        // equal. For container types, that comparison will postpone comparison
                        // of any sub-container pair to the end of the pair queue. This gives
                        // breadth-first search order. It also avoids the reprocessing of
                        // reference-equal siblings, cousins etc, which can have a significant speed
                        // impact when comparing a container of small objects each of which has a
                        // reference to the same (singleton) large object.
                        if (pair.a !== pair.b && !typeEquiv(pair.a, pair.b)) {
                                return false;
                        }
                }

                // ...across all consecutive argument pairs
                return arguments.length === 2 || innerEquiv.apply(this, [].slice.call(arguments, 1));
        }

        return function () {
                var result = innerEquiv.apply(undefined, arguments);

                // Release any retained objects
                pairs.length = 0;
                return result;
        };
  })();

  /**
   * Config object: Maintain internal state
   * Later exposed as QUnit.config
   * `config` initialized at top of scope
   */
  var config = {

        // The queue of tests to run
        queue: [],

        // Block until document ready
        blocking: true,

        // By default, run previously failed tests first
        // very useful in combination with "Hide passed tests" checked
        reorder: true,

        // By default, modify document.title when suite is done
        altertitle: true,

        // HTML Reporter: collapse every test except the first failing test
        // If false, all failing tests will be expanded
        collapse: true,

        // By default, scroll to top of the page when suite is done
        scrolltop: true,

        // Depth up-to which object will be dumped
        maxDepth: 5,

        // When enabled, all tests must call expect()
        requireExpects: false,

        // Placeholder for user-configurable form-exposed URL parameters
        urlConfig: [],

        // Set of all modules.
        modules: [],

        // The first unnamed module
        currentModule: {
                name: "",
                tests: [],
                childModules: [],
                testsRun: 0,
                unskippedTestsRun: 0,
                hooks: {
                        before: [],
                        beforeEach: [],
                        afterEach: [],
                        after: []
                }
        },

        callbacks: {},

        // The storage module to use for reordering tests
        storage: localSessionStorage
  };

  // take a predefined QUnit.config and extend the defaults
  var globalConfig = window && window.QUnit && window.QUnit.config;

  // only extend the global config if there is no QUnit overload
  if (window && window.QUnit && !window.QUnit.version) {
        extend(config, globalConfig);
  }

  // Push a loose unnamed module to the modules collection
  config.modules.push(config.currentModule);

  // Based on jsDump by Ariel Flesler
  // http://flesler.blogspot.com/2008/05/jsdump-pretty-dump-of-any-javascript.html
  var dump = (function () {
        function quote(str) {
                return "\"" + str.toString().replace(/\\/g, "\\\\").replace(/"/g, "\\\"") + "\"";
        }
        function literal(o) {
                return o + "";
        }
        function join(pre, arr, post) {
                var s = dump.separator(),
                    base = dump.indent(),
                    inner = dump.indent(1);
                if (arr.join) {
                        arr = arr.join("," + s + inner);
                }
                if (!arr) {
                        return pre + post;
                }
                return [pre, inner + arr, base + post].join(s);
        }
        function array(arr, stack) {
                var i = arr.length,
                    ret = new Array(i);

                if (dump.maxDepth && dump.depth > dump.maxDepth) {
                        return "[object Array]";
                }

                this.up();
                while (i--) {
                        ret[i] = this.parse(arr[i], undefined, stack);
                }
                this.down();
                return join("[", ret, "]");
        }

        function isArray(obj) {
                return (

                        //Native Arrays
                        toString.call(obj) === "[object Array]" ||

                        // NodeList objects
                        typeof obj.length === "number" && obj.item !== undefined && (obj.length ? obj.item(0) === obj[0] : obj.item(0) === null && obj[0] === undefined)
                );
        }

        var reName = /^function (\w+)/,
            dump = {

                // The objType is used mostly internally, you can fix a (custom) type in advance
                parse: function parse(obj, objType, stack) {
                        stack = stack || [];
                        var res,
                            parser,
                            parserType,
                            objIndex = stack.indexOf(obj);

                        if (objIndex !== -1) {
                                return "recursion(" + (objIndex - stack.length) + ")";
                        }

                        objType = objType || this.typeOf(obj);
                        parser = this.parsers[objType];
                        parserType = typeof parser === "undefined" ? "undefined" : _typeof(parser);

                        if (parserType === "function") {
                                stack.push(obj);
                                res = parser.call(this, obj, stack);
                                stack.pop();
                                return res;
                        }
                        return parserType === "string" ? parser : this.parsers.error;
                },
                typeOf: function typeOf(obj) {
                        var type;

                        if (obj === null) {
                                type = "null";
                        } else if (typeof obj === "undefined") {
                                type = "undefined";
                        } else if (is("regexp", obj)) {
                                type = "regexp";
                        } else if (is("date", obj)) {
                                type = "date";
                        } else if (is("function", obj)) {
                                type = "function";
                        } else if (obj.setInterval !== undefined && obj.document !== undefined && obj.nodeType === undefined) {
                                type = "window";
                        } else if (obj.nodeType === 9) {
                                type = "document";
                        } else if (obj.nodeType) {
                                type = "node";
                        } else if (isArray(obj)) {
                                type = "array";
                        } else if (obj.constructor === Error.prototype.constructor) {
                                type = "error";
                        } else {
                                type = typeof obj === "undefined" ? "undefined" : _typeof(obj);
                        }
                        return type;
                },

                separator: function separator() {
                        if (this.multiline) {
                                return this.HTML ? "<br />" : "\n";
                        } else {
                                return this.HTML ? "&#160;" : " ";
                        }
                },

                // Extra can be a number, shortcut for increasing-calling-decreasing
                indent: function indent(extra) {
                        if (!this.multiline) {
                                return "";
                        }
                        var chr = this.indentChar;
                        if (this.HTML) {
                                chr = chr.replace(/\t/g, "   ").replace(/ /g, "&#160;");
                        }
                        return new Array(this.depth + (extra || 0)).join(chr);
                },
                up: function up(a) {
                        this.depth += a || 1;
                },
                down: function down(a) {
                        this.depth -= a || 1;
                },
                setParser: function setParser(name, parser) {
                        this.parsers[name] = parser;
                },

                // The next 3 are exposed so you can use them
                quote: quote,
                literal: literal,
                join: join,
                depth: 1,
                maxDepth: config.maxDepth,

                // This is the list of parsers, to modify them, use dump.setParser
                parsers: {
                        window: "[Window]",
                        document: "[Document]",
                        error: function error(_error) {
                                return "Error(\"" + _error.message + "\")";
                        },
                        unknown: "[Unknown]",
                        "null": "null",
                        "undefined": "undefined",
                        "function": function _function(fn) {
                                var ret = "function",


                                // Functions never have name in IE
                                name = "name" in fn ? fn.name : (reName.exec(fn) || [])[1];

                                if (name) {
                                        ret += " " + name;
                                }
                                ret += "(";

                                ret = [ret, dump.parse(fn, "functionArgs"), "){"].join("");
                                return join(ret, dump.parse(fn, "functionCode"), "}");
                        },
                        array: array,
                        nodelist: array,
                        "arguments": array,
                        object: function object(map, stack) {
                                var keys,
                                    key,
                                    val,
                                    i,
                                    nonEnumerableProperties,
                                    ret = [];

                                if (dump.maxDepth && dump.depth > dump.maxDepth) {
                                        return "[object Object]";
                                }

                                dump.up();
                                keys = [];
                                for (key in map) {
                                        keys.push(key);
                                }

                                // Some properties are not always enumerable on Error objects.
                                nonEnumerableProperties = ["message", "name"];
                                for (i in nonEnumerableProperties) {
                                        key = nonEnumerableProperties[i];
                                        if (key in map && !inArray(key, keys)) {
                                                keys.push(key);
                                        }
                                }
                                keys.sort();
                                for (i = 0; i < keys.length; i++) {
                                        key = keys[i];
                                        val = map[key];
                                        ret.push(dump.parse(key, "key") + ": " + dump.parse(val, undefined, stack));
                                }
                                dump.down();
                                return join("{", ret, "}");
                        },
                        node: function node(_node) {
                                var len,
                                    i,
                                    val,
                                    open = dump.HTML ? "&lt;" : "<",
                                    close = dump.HTML ? "&gt;" : ">",
                                    tag = _node.nodeName.toLowerCase(),
                                    ret = open + tag,
                                    attrs = _node.attributes;

                                if (attrs) {
                                        for (i = 0, len = attrs.length; i < len; i++) {
                                                val = attrs[i].nodeValue;

                                                // IE6 includes all attributes in .attributes, even ones not explicitly
                                                // set. Those have values like undefined, null, 0, false, "" or
                                                // "inherit".
                                                if (val && val !== "inherit") {
                                                        ret += " " + attrs[i].nodeName + "=" + dump.parse(val, "attribute");
                                                }
                                        }
                                }
                                ret += close;

                                // Show content of TextNode or CDATASection
                                if (_node.nodeType === 3 || _node.nodeType === 4) {
                                        ret += _node.nodeValue;
                                }

                                return ret + open + "/" + tag + close;
                        },

                        // Function calls it internally, it's the arguments part of the function
                        functionArgs: function functionArgs(fn) {
                                var args,
                                    l = fn.length;

                                if (!l) {
                                        return "";
                                }

                                args = new Array(l);
                                while (l--) {

                                        // 97 is 'a'
                                        args[l] = String.fromCharCode(97 + l);
                                }
                                return " " + args.join(", ") + " ";
                        },

                        // Object calls it internally, the key part of an item in a map
                        key: quote,

                        // Function calls it internally, it's the content of the function
                        functionCode: "[code]",

                        // Node calls it internally, it's a html attribute value
                        attribute: quote,
                        string: quote,
                        date: quote,
                        regexp: literal,
                        number: literal,
                        "boolean": literal,
                        symbol: function symbol(sym) {
                                return sym.toString();
                        }
                },

                // If true, entities are escaped ( <, >, \t, space and \n )
                HTML: false,

                // Indentation unit
                indentChar: "  ",

                // If true, items in a collection, are separated by a \n, else just a space.
                multiline: true
        };

        return dump;
  })();

  var LISTENERS = Object.create(null);
  var SUPPORTED_EVENTS = ["runStart", "suiteStart", "testStart", "assertion", "testEnd", "suiteEnd", "runEnd"];

  /**
   * Emits an event with the specified data to all currently registered listeners.
   * Callbacks will fire in the order in which they are registered (FIFO). This
   * function is not exposed publicly; it is used by QUnit internals to emit
   * logging events.
   *
   * @private
   * @method emit
   * @param {String} eventName
   * @param {Object} data
   * @return {Void}
   */
  function emit(eventName, data) {
        if (objectType(eventName) !== "string") {
                throw new TypeError("eventName must be a string when emitting an event");
        }

        // Clone the callbacks in case one of them registers a new callback
        var originalCallbacks = LISTENERS[eventName];
        var callbacks = originalCallbacks ? [].concat(toConsumableArray(originalCallbacks)) : [];

        for (var i = 0; i < callbacks.length; i++) {
                callbacks[i](data);
        }
  }

  /**
   * Registers a callback as a listener to the specified event.
   *
   * @public
   * @method on
   * @param {String} eventName
   * @param {Function} callback
   * @return {Void}
   */
  function on(eventName, callback) {
        if (objectType(eventName) !== "string") {
                throw new TypeError("eventName must be a string when registering a listener");
        } else if (!inArray(eventName, SUPPORTED_EVENTS)) {
                var events = SUPPORTED_EVENTS.join(", ");
                throw new Error("\"" + eventName + "\" is not a valid event; must be one of: " + events + ".");
        } else if (objectType(callback) !== "function") {
                throw new TypeError("callback must be a function when registering a listener");
        }

        if (!LISTENERS[eventName]) {
                LISTENERS[eventName] = [];
        }

        // Don't register the same callback more than once
        if (!inArray(callback, LISTENERS[eventName])) {
                LISTENERS[eventName].push(callback);
        }
  }

  // Register logging callbacks
  function registerLoggingCallbacks(obj) {
        var i,
            l,
            key,
            callbackNames = ["begin", "done", "log", "testStart", "testDone", "moduleStart", "moduleDone"];

        function registerLoggingCallback(key) {
                var loggingCallback = function loggingCallback(callback) {
                        if (objectType(callback) !== "function") {
                                throw new Error("QUnit logging methods require a callback function as their first parameters.");
                        }

                        config.callbacks[key].push(callback);
                };

                return loggingCallback;
        }

        for (i = 0, l = callbackNames.length; i < l; i++) {
                key = callbackNames[i];

                // Initialize key collection of logging callback
                if (objectType(config.callbacks[key]) === "undefined") {
                        config.callbacks[key] = [];
                }

                obj[key] = registerLoggingCallback(key);
        }
  }

  function runLoggingCallbacks(key, args) {
        var i, l, callbacks;

        callbacks = config.callbacks[key];
        for (i = 0, l = callbacks.length; i < l; i++) {
                callbacks[i](args);
        }
  }

  // Doesn't support IE9, it will return undefined on these browsers
  // See also https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error/Stack
  var fileName = (sourceFromStacktrace(0) || "").replace(/(:\d+)+\)?/, "").replace(/.+\//, "");

  function extractStacktrace(e, offset) {
        offset = offset === undefined ? 4 : offset;

        var stack, include, i;

        if (e && e.stack) {
                stack = e.stack.split("\n");
                if (/^error$/i.test(stack[0])) {
                        stack.shift();
                }
                if (fileName) {
                        include = [];
                        for (i = offset; i < stack.length; i++) {
                                if (stack[i].indexOf(fileName) !== -1) {
                                        break;
                                }
                                include.push(stack[i]);
                        }
                        if (include.length) {
                                return include.join("\n");
                        }
                }
                return stack[offset];
        }
  }

  function sourceFromStacktrace(offset) {
        var error = new Error();

        // Support: Safari <=7 only, IE <=10 - 11 only
        // Not all browsers generate the `stack` property for `new Error()`, see also #636
        if (!error.stack) {
                try {
                        throw error;
                } catch (err) {
                        error = err;
                }
        }

        return extractStacktrace(error, offset);
  }

  var priorityCount = 0;
  var unitSampler = void 0;

  // This is a queue of functions that are tasks within a single test.
  // After tests are dequeued from config.queue they are expanded into
  // a set of tasks in this queue.
  var taskQueue = [];

  /**
   * Advances the taskQueue to the next task. If the taskQueue is empty,
   * process the testQueue
   */
  function advance() {
        advanceTaskQueue();

        if (!taskQueue.length) {
                advanceTestQueue();
        }
  }

  /**
   * Advances the taskQueue to the next task if it is ready and not empty.
   */
  function advanceTaskQueue() {
        var start = now();
        config.depth = (config.depth || 0) + 1;

        while (taskQueue.length && !config.blocking) {
                var elapsedTime = now() - start;

                if (!defined.setTimeout || config.updateRate <= 0 || elapsedTime < config.updateRate) {
                        var task = taskQueue.shift();
                        task();
                } else {
                        setTimeout(advance);
                        break;
                }
        }

        config.depth--;
  }

  /**
   * Advance the testQueue to the next test to process. Call done() if testQueue completes.
   */
  function advanceTestQueue() {
        if (!config.blocking && !config.queue.length && config.depth === 0) {
                done();
                return;
        }

        var testTasks = config.queue.shift();
        addToTaskQueue(testTasks());

        if (priorityCount > 0) {
                priorityCount--;
        }

        advance();
  }

  /**
   * Enqueue the tasks for a test into the task queue.
   * @param {Array} tasksArray
   */
  function addToTaskQueue(tasksArray) {
        taskQueue.push.apply(taskQueue, toConsumableArray(tasksArray));
  }

  /**
   * Return the number of tasks remaining in the task queue to be processed.
   * @return {Number}
   */
  function taskQueueLength() {
        return taskQueue.length;
  }

  /**
   * Adds a test to the TestQueue for execution.
   * @param {Function} testTasksFunc
   * @param {Boolean} prioritize
   * @param {String} seed
   */
  function addToTestQueue(testTasksFunc, prioritize, seed) {
        if (prioritize) {
                config.queue.splice(priorityCount++, 0, testTasksFunc);
        } else if (seed) {
                if (!unitSampler) {
                        unitSampler = unitSamplerGenerator(seed);
                }

                // Insert into a random position after all prioritized items
                var index = Math.floor(unitSampler() * (config.queue.length - priorityCount + 1));
                config.queue.splice(priorityCount + index, 0, testTasksFunc);
        } else {
                config.queue.push(testTasksFunc);
        }
  }

  /**
   * Creates a seeded "sample" generator which is used for randomizing tests.
   */
  function unitSamplerGenerator(seed) {

        // 32-bit xorshift, requires only a nonzero seed
        // http://excamera.com/sphinx/article-xorshift.html
        var sample = parseInt(generateHash(seed), 16) || -1;
        return function () {
                sample ^= sample << 13;
                sample ^= sample >>> 17;
                sample ^= sample << 5;

                // ECMAScript has no unsigned number type
                if (sample < 0) {
                        sample += 0x100000000;
                }

                return sample / 0x100000000;
        };
  }

  /**
   * This function is called when the ProcessingQueue is done processing all
   * items. It handles emitting the final run events.
   */
  function done() {
        var storage = config.storage;

        ProcessingQueue.finished = true;

        var runtime = now() - config.started;
        var passed = config.stats.all - config.stats.bad;

        if (config.stats.all === 0) {

                if (config.filter && config.filter.length) {
                        throw new Error("No tests matched the filter \"" + config.filter + "\".");
                }

                if (config.module && config.module.length) {
                        throw new Error("No tests matched the module \"" + config.module + "\".");
                }

                if (config.moduleId && config.moduleId.length) {
                        throw new Error("No tests matched the moduleId \"" + config.moduleId + "\".");
                }

                if (config.testId && config.testId.length) {
                        throw new Error("No tests matched the testId \"" + config.testId + "\".");
                }

                throw new Error("No tests were run.");
        }

        emit("runEnd", globalSuite.end(true));
        runLoggingCallbacks("done", {
                passed: passed,
                failed: config.stats.bad,
                total: config.stats.all,
                runtime: runtime
        });

        // Clear own storage items if all tests passed
        if (storage && config.stats.bad === 0) {
                for (var i = storage.length - 1; i >= 0; i--) {
                        var key = storage.key(i);

                        if (key.indexOf("qunit-test-") === 0) {
                                storage.removeItem(key);
                        }
                }
        }
  }

  var ProcessingQueue = {
        finished: false,
        add: addToTestQueue,
        advance: advance,
        taskCount: taskQueueLength
  };

  var TestReport = function () {
        function TestReport(name, suite, options) {
                classCallCheck(this, TestReport);

                this.name = name;
                this.suiteName = suite.name;
                this.fullName = suite.fullName.concat(name);
                this.runtime = 0;
                this.assertions = [];

                this.skipped = !!options.skip;
                this.todo = !!options.todo;

                this.valid = options.valid;

                this._startTime = 0;
                this._endTime = 0;

                suite.pushTest(this);
        }

        createClass(TestReport, [{
                key: "start",
                value: function start(recordTime) {
                        if (recordTime) {
                                this._startTime = Date.now();
                        }

                        return {
                                name: this.name,
                                suiteName: this.suiteName,
                                fullName: this.fullName.slice()
                        };
                }
        }, {
                key: "end",
                value: function end(recordTime) {
                        if (recordTime) {
                                this._endTime = Date.now();
                        }

                        return extend(this.start(), {
                                runtime: this.getRuntime(),
                                status: this.getStatus(),
                                errors: this.getFailedAssertions(),
                                assertions: this.getAssertions()
                        });
                }
        }, {
                key: "pushAssertion",
                value: function pushAssertion(assertion) {
                        this.assertions.push(assertion);
                }
        }, {
                key: "getRuntime",
                value: function getRuntime() {
                        return this._endTime - this._startTime;
                }
        }, {
                key: "getStatus",
                value: function getStatus() {
                        if (this.skipped) {
                                return "skipped";
                        }

                        var testPassed = this.getFailedAssertions().length > 0 ? this.todo : !this.todo;

                        if (!testPassed) {
                                return "failed";
                        } else if (this.todo) {
                                return "todo";
                        } else {
                                return "passed";
                        }
                }
        }, {
                key: "getFailedAssertions",
                value: function getFailedAssertions() {
                        return this.assertions.filter(function (assertion) {
                                return !assertion.passed;
                        });
                }
        }, {
                key: "getAssertions",
                value: function getAssertions() {
                        return this.assertions.slice();
                }

                // Remove actual and expected values from assertions. This is to prevent
                // leaking memory throughout a test suite.

        }, {
                key: "slimAssertions",
                value: function slimAssertions() {
                        this.assertions = this.assertions.map(function (assertion) {
                                delete assertion.actual;
                                delete assertion.expected;
                                return assertion;
                        });
                }
        }]);
        return TestReport;
  }();

  var focused$1 = false;

  function Test(settings) {
        var i, l;

        ++Test.count;

        this.expected = null;
        this.assertions = [];
        this.semaphore = 0;
        this.module = config.currentModule;
        this.stack = sourceFromStacktrace(3);
        this.steps = [];
        this.timeout = undefined;

        // If a module is skipped, all its tests and the tests of the child suites
        // should be treated as skipped even if they are defined as `only` or `todo`.
        // As for `todo` module, all its tests will be treated as `todo` except for
        // tests defined as `skip` which will be left intact.
        //
        // So, if a test is defined as `todo` and is inside a skipped module, we should
        // then treat that test as if was defined as `skip`.
        if (this.module.skip) {
                settings.skip = true;
                settings.todo = false;

                // Skipped tests should be left intact
        } else if (this.module.todo && !settings.skip) {
                settings.todo = true;
        }

        extend(this, settings);

        this.testReport = new TestReport(settings.testName, this.module.suiteReport, {
                todo: settings.todo,
                skip: settings.skip,
                valid: this.valid()
        });

        // Register unique strings
        for (i = 0, l = this.module.tests; i < l.length; i++) {
                if (this.module.tests[i].name === this.testName) {
                        this.testName += " ";
                }
        }

        this.testId = generateHash(this.module.name, this.testName);

        this.module.tests.push({
                name: this.testName,
                testId: this.testId,
                skip: !!settings.skip
        });

        if (settings.skip) {

                // Skipped tests will fully ignore any sent callback
                this.callback = function () {};
                this.async = false;
                this.expected = 0;
        } else {
                if (typeof this.callback !== "function") {
                        var method = this.todo ? "todo" : "test";

                        // eslint-disable-next-line max-len
                        throw new TypeError("You must provide a function as a test callback to QUnit." + method + "(\"" + settings.testName + "\")");
                }

                this.assert = new Assert(this);
        }
  }

  Test.count = 0;

  function getNotStartedModules(startModule) {
        var module = startModule,
            modules = [];

        while (module && module.testsRun === 0) {
                modules.push(module);
                module = module.parentModule;
        }

        return modules;
  }

  Test.prototype = {
        before: function before() {
                var i,
                    startModule,
                    module = this.module,
                    notStartedModules = getNotStartedModules(module);

                for (i = notStartedModules.length - 1; i >= 0; i--) {
                        startModule = notStartedModules[i];
                        startModule.stats = { all: 0, bad: 0, started: now() };
                        emit("suiteStart", startModule.suiteReport.start(true));
                        runLoggingCallbacks("moduleStart", {
                                name: startModule.name,
                                tests: startModule.tests
                        });
                }

                config.current = this;

                this.testEnvironment = extend({}, module.testEnvironment);

                this.started = now();
                emit("testStart", this.testReport.start(true));
                runLoggingCallbacks("testStart", {
                        name: this.testName,
                        module: module.name,
                        testId: this.testId,
                        previousFailure: this.previousFailure
                });

                if (!config.pollution) {
                        saveGlobal();
                }
        },

        run: function run() {
                var promise;

                config.current = this;

                this.callbackStarted = now();

                if (config.notrycatch) {
                        runTest(this);
                        return;
                }

                try {
                        runTest(this);
                } catch (e) {
                        this.pushFailure("Died on test #" + (this.assertions.length + 1) + " " + this.stack + ": " + (e.message || e), extractStacktrace(e, 0));

                        // Else next test will carry the responsibility
                        saveGlobal();

                        // Restart the tests if they're blocking
                        if (config.blocking) {
                                internalRecover(this);
                        }
                }

                function runTest(test) {
                        promise = test.callback.call(test.testEnvironment, test.assert);
                        test.resolvePromise(promise);

                        // If the test has a "lock" on it, but the timeout is 0, then we push a
                        // failure as the test should be synchronous.
                        if (test.timeout === 0 && test.semaphore !== 0) {
                                pushFailure("Test did not finish synchronously even though assert.timeout( 0 ) was used.", sourceFromStacktrace(2));
                        }
                }
        },

        after: function after() {
                checkPollution();
        },

        queueHook: function queueHook(hook, hookName, hookOwner) {
                var _this = this;

                var callHook = function callHook() {
                        var promise = hook.call(_this.testEnvironment, _this.assert);
                        _this.resolvePromise(promise, hookName);
                };

                var runHook = function runHook() {
                        if (hookName === "before") {
                                if (hookOwner.unskippedTestsRun !== 0) {
                                        return;
                                }

                                _this.preserveEnvironment = true;
                        }

                        // The 'after' hook should only execute when there are not tests left and
                        // when the 'after' and 'finish' tasks are the only tasks left to process
                        if (hookName === "after" && hookOwner.unskippedTestsRun !== numberOfUnskippedTests(hookOwner) - 1 && (config.queue.length > 0 || ProcessingQueue.taskCount() > 2)) {
                                return;
                        }

                        config.current = _this;
                        if (config.notrycatch) {
                                callHook();
                                return;
                        }
                        try {
                                callHook();
                        } catch (error) {
                                _this.pushFailure(hookName + " failed on " + _this.testName + ": " + (error.message || error), extractStacktrace(error, 0));
                        }
                };

                return runHook;
        },


        // Currently only used for module level hooks, can be used to add global level ones
        hooks: function hooks(handler) {
                var hooks = [];

                function processHooks(test, module) {
                        if (module.parentModule) {
                                processHooks(test, module.parentModule);
                        }

                        if (module.hooks[handler].length) {
                                for (var i = 0; i < module.hooks[handler].length; i++) {
                                        hooks.push(test.queueHook(module.hooks[handler][i], handler, module));
                                }
                        }
                }

                // Hooks are ignored on skipped tests
                if (!this.skip) {
                        processHooks(this, this.module);
                }

                return hooks;
        },


        finish: function finish() {
                config.current = this;

                if (this.steps.length) {
                        var stepsList = this.steps.join(", ");
                        this.pushFailure("Expected assert.verifySteps() to be called before end of test " + ("after using assert.step(). Unverified steps: " + stepsList), this.stack);
                }

                if (config.requireExpects && this.expected === null) {
                        this.pushFailure("Expected number of assertions to be defined, but expect() was " + "not called.", this.stack);
                } else if (this.expected !== null && this.expected !== this.assertions.length) {
                        this.pushFailure("Expected " + this.expected + " assertions, but " + this.assertions.length + " were run", this.stack);
                } else if (this.expected === null && !this.assertions.length) {
                        this.pushFailure("Expected at least one assertion, but none were run - call " + "expect(0) to accept zero assertions.", this.stack);
                }

                var i,
                    module = this.module,
                    moduleName = module.name,
                    testName = this.testName,
                    skipped = !!this.skip,
                    todo = !!this.todo,
                    bad = 0,
                    storage = config.storage;

                this.runtime = now() - this.started;

                config.stats.all += this.assertions.length;
                module.stats.all += this.assertions.length;

                for (i = 0; i < this.assertions.length; i++) {
                        if (!this.assertions[i].result) {
                                bad++;
                                config.stats.bad++;
                                module.stats.bad++;
                        }
                }

                notifyTestsRan(module, skipped);

                // Store result when possible
                if (storage) {
                        if (bad) {
                                storage.setItem("qunit-test-" + moduleName + "-" + testName, bad);
                        } else {
                                storage.removeItem("qunit-test-" + moduleName + "-" + testName);
                        }
                }

                // After emitting the js-reporters event we cleanup the assertion data to
                // avoid leaking it. It is not used by the legacy testDone callbacks.
                emit("testEnd", this.testReport.end(true));
                this.testReport.slimAssertions();

                runLoggingCallbacks("testDone", {
                        name: testName,
                        module: moduleName,
                        skipped: skipped,
                        todo: todo,
                        failed: bad,
                        passed: this.assertions.length - bad,
                        total: this.assertions.length,
                        runtime: skipped ? 0 : this.runtime,

                        // HTML Reporter use
                        assertions: this.assertions,
                        testId: this.testId,

                        // Source of Test
                        source: this.stack
                });

                if (module.testsRun === numberOfTests(module)) {
                        logSuiteEnd(module);

                        // Check if the parent modules, iteratively, are done. If that the case,
                        // we emit the `suiteEnd` event and trigger `moduleDone` callback.
                        var parent = module.parentModule;
                        while (parent && parent.testsRun === numberOfTests(parent)) {
                                logSuiteEnd(parent);
                                parent = parent.parentModule;
                        }
                }

                config.current = undefined;

                function logSuiteEnd(module) {
                        emit("suiteEnd", module.suiteReport.end(true));
                        runLoggingCallbacks("moduleDone", {
                                name: module.name,
                                tests: module.tests,
                                failed: module.stats.bad,
                                passed: module.stats.all - module.stats.bad,
                                total: module.stats.all,
                                runtime: now() - module.stats.started
                        });
                }
        },

        preserveTestEnvironment: function preserveTestEnvironment() {
                if (this.preserveEnvironment) {
                        this.module.testEnvironment = this.testEnvironment;
                        this.testEnvironment = extend({}, this.module.testEnvironment);
                }
        },

        queue: function queue() {
                var test = this;

                if (!this.valid()) {
                        return;
                }

                function runTest() {
                        return [function () {
                                test.before();
                        }].concat(toConsumableArray(test.hooks("before")), [function () {
                                test.preserveTestEnvironment();
                        }], toConsumableArray(test.hooks("beforeEach")), [function () {
                                test.run();
                        }], toConsumableArray(test.hooks("afterEach").reverse()), toConsumableArray(test.hooks("after").reverse()), [function () {
                                test.after();
                        }, function () {
                                test.finish();
                        }]);
                }

                var previousFailCount = config.storage && +config.storage.getItem("qunit-test-" + this.module.name + "-" + this.testName);

                // Prioritize previously failed tests, detected from storage
                var prioritize = config.reorder && !!previousFailCount;

                this.previousFailure = !!previousFailCount;

                ProcessingQueue.add(runTest, prioritize, config.seed);

                // If the queue has already finished, we manually process the new test
                if (ProcessingQueue.finished) {
                        ProcessingQueue.advance();
                }
        },


        pushResult: function pushResult(resultInfo) {
                if (this !== config.current) {
                        throw new Error("Assertion occurred after test had finished.");
                }

                // Destructure of resultInfo = { result, actual, expected, message, negative }
                var source,
                    details = {
                        module: this.module.name,
                        name: this.testName,
                        result: resultInfo.result,
                        message: resultInfo.message,
                        actual: resultInfo.actual,
                        testId: this.testId,
                        negative: resultInfo.negative || false,
                        runtime: now() - this.started,
                        todo: !!this.todo
                };

                if (hasOwn.call(resultInfo, "expected")) {
                        details.expected = resultInfo.expected;
                }

                if (!resultInfo.result) {
                        source = resultInfo.source || sourceFromStacktrace();

                        if (source) {
                                details.source = source;
                        }
                }

                this.logAssertion(details);

                this.assertions.push({
                        result: !!resultInfo.result,
                        message: resultInfo.message
                });
        },

        pushFailure: function pushFailure(message, source, actual) {
                if (!(this instanceof Test)) {
                        throw new Error("pushFailure() assertion outside test context, was " + sourceFromStacktrace(2));
                }

                this.pushResult({
                        result: false,
                        message: message || "error",
                        actual: actual || null,
                        source: source
                });
        },

        /**
    * Log assertion details using both the old QUnit.log interface and
    * QUnit.on( "assertion" ) interface.
    *
    * @private
    */
        logAssertion: function logAssertion(details) {
                runLoggingCallbacks("log", details);

                var assertion = {
                        passed: details.result,
                        actual: details.actual,
                        expected: details.expected,
                        message: details.message,
                        stack: details.source,
                        todo: details.todo
                };
                this.testReport.pushAssertion(assertion);
                emit("assertion", assertion);
        },


        resolvePromise: function resolvePromise(promise, phase) {
                var then,
                    resume,
                    message,
                    test = this;
                if (promise != null) {
                        then = promise.then;
                        if (objectType(then) === "function") {
                                resume = internalStop(test);
                                if (config.notrycatch) {
                                        then.call(promise, function () {
                                                resume();
                                        });
                                } else {
                                        then.call(promise, function () {
                                                resume();
                                        }, function (error) {
                                                message = "Promise rejected " + (!phase ? "during" : phase.replace(/Each$/, "")) + " \"" + test.testName + "\": " + (error && error.message || error);
                                                test.pushFailure(message, extractStacktrace(error, 0));

                                                // Else next test will carry the responsibility
                                                saveGlobal();

                                                // Unblock
                                                internalRecover(test);
                                        });
                                }
                        }
                }
        },

        valid: function valid() {
                var filter = config.filter,
                    regexFilter = /^(!?)\/([\w\W]*)\/(i?$)/.exec(filter),
                    module = config.module && config.module.toLowerCase(),
                    fullName = this.module.name + ": " + this.testName;

                function moduleChainNameMatch(testModule) {
                        var testModuleName = testModule.name ? testModule.name.toLowerCase() : null;
                        if (testModuleName === module) {
                                return true;
                        } else if (testModule.parentModule) {
                                return moduleChainNameMatch(testModule.parentModule);
                        } else {
                                return false;
                        }
                }

                function moduleChainIdMatch(testModule) {
                        return inArray(testModule.moduleId, config.moduleId) || testModule.parentModule && moduleChainIdMatch(testModule.parentModule);
                }

                // Internally-generated tests are always valid
                if (this.callback && this.callback.validTest) {
                        return true;
                }

                if (config.moduleId && config.moduleId.length > 0 && !moduleChainIdMatch(this.module)) {

                        return false;
                }

                if (config.testId && config.testId.length > 0 && !inArray(this.testId, config.testId)) {

                        return false;
                }

                if (module && !moduleChainNameMatch(this.module)) {
                        return false;
                }

                if (!filter) {
                        return true;
                }

                return regexFilter ? this.regexFilter(!!regexFilter[1], regexFilter[2], regexFilter[3], fullName) : this.stringFilter(filter, fullName);
        },

        regexFilter: function regexFilter(exclude, pattern, flags, fullName) {
                var regex = new RegExp(pattern, flags);
                var match = regex.test(fullName);

                return match !== exclude;
        },

        stringFilter: function stringFilter(filter, fullName) {
                filter = filter.toLowerCase();
                fullName = fullName.toLowerCase();

                var include = filter.charAt(0) !== "!";
                if (!include) {
                        filter = filter.slice(1);
                }

                // If the filter matches, we need to honour include
                if (fullName.indexOf(filter) !== -1) {
                        return include;
                }

                // Otherwise, do the opposite
                return !include;
        }
  };

  function pushFailure() {
        if (!config.current) {
                throw new Error("pushFailure() assertion outside test context, in " + sourceFromStacktrace(2));
        }

        // Gets current test obj
        var currentTest = config.current;

        return currentTest.pushFailure.apply(currentTest, arguments);
  }

  function saveGlobal() {
        config.pollution = [];

        if (config.noglobals) {
                for (var key in global$1) {
                        if (hasOwn.call(global$1, key)) {

                                // In Opera sometimes DOM element ids show up here, ignore them
                                if (/^qunit-test-output/.test(key)) {
                                        continue;
                                }
                                config.pollution.push(key);
                        }
                }
        }
  }

  function checkPollution() {
        var newGlobals,
            deletedGlobals,
            old = config.pollution;

        saveGlobal();

        newGlobals = diff(config.pollution, old);
        if (newGlobals.length > 0) {
                pushFailure("Introduced global variable(s): " + newGlobals.join(", "));
        }

        deletedGlobals = diff(old, config.pollution);
        if (deletedGlobals.length > 0) {
                pushFailure("Deleted global variable(s): " + deletedGlobals.join(", "));
        }
  }

  // Will be exposed as QUnit.test
  function test(testName, callback) {
        if (focused$1) {
                return;
        }

        var newTest = new Test({
                testName: testName,
                callback: callback
        });

        newTest.queue();
  }

  function todo(testName, callback) {
        if (focused$1) {
                return;
        }

        var newTest = new Test({
                testName: testName,
                callback: callback,
                todo: true
        });

        newTest.queue();
  }

  // Will be exposed as QUnit.skip
  function skip(testName) {
        if (focused$1) {
                return;
        }

        var test = new Test({
                testName: testName,
                skip: true
        });

        test.queue();
  }

  // Will be exposed as QUnit.only
  function only(testName, callback) {
        if (focused$1) {
                return;
        }

        config.queue.length = 0;
        focused$1 = true;

        var newTest = new Test({
                testName: testName,
                callback: callback
        });

        newTest.queue();
  }

  // Put a hold on processing and return a function that will release it.
  function internalStop(test) {
        test.semaphore += 1;
        config.blocking = true;

        // Set a recovery timeout, if so configured.
        if (defined.setTimeout) {
                var timeoutDuration = void 0;

                if (typeof test.timeout === "number") {
                        timeoutDuration = test.timeout;
                } else if (typeof config.testTimeout === "number") {
                        timeoutDuration = config.testTimeout;
                }

                if (typeof timeoutDuration === "number" && timeoutDuration > 0) {
                        clearTimeout(config.timeout);
                        config.timeout = setTimeout(function () {
                                pushFailure("Test took longer than " + timeoutDuration + "ms; test timed out.", sourceFromStacktrace(2));
                                internalRecover(test);
                        }, timeoutDuration);
                }
        }

        var released = false;
        return function resume() {
                if (released) {
                        return;
                }

                released = true;
                test.semaphore -= 1;
                internalStart(test);
        };
  }

  // Forcefully release all processing holds.
  function internalRecover(test) {
        test.semaphore = 0;
        internalStart(test);
  }

  // Release a processing hold, scheduling a resumption attempt if no holds remain.
  function internalStart(test) {

        // If semaphore is non-numeric, throw error
        if (isNaN(test.semaphore)) {
                test.semaphore = 0;

                pushFailure("Invalid value on test.semaphore", sourceFromStacktrace(2));
                return;
        }

        // Don't start until equal number of stop-calls
        if (test.semaphore > 0) {
                return;
        }

        // Throw an Error if start is called more often than stop
        if (test.semaphore < 0) {
                test.semaphore = 0;

                pushFailure("Tried to restart test while already started (test's semaphore was 0 already)", sourceFromStacktrace(2));
                return;
        }

        // Add a slight delay to allow more assertions etc.
        if (defined.setTimeout) {
                if (config.timeout) {
                        clearTimeout(config.timeout);
                }
                config.timeout = setTimeout(function () {
                        if (test.semaphore > 0) {
                                return;
                        }

                        if (config.timeout) {
                                clearTimeout(config.timeout);
                        }

                        begin();
                });
        } else {
                begin();
        }
  }

  function collectTests(module) {
        var tests = [].concat(module.tests);
        var modules = [].concat(toConsumableArray(module.childModules));

        // Do a breadth-first traversal of the child modules
        while (modules.length) {
                var nextModule = modules.shift();
                tests.push.apply(tests, nextModule.tests);
                modules.push.apply(modules, toConsumableArray(nextModule.childModules));
        }

        return tests;
  }

  function numberOfTests(module) {
        return collectTests(module).length;
  }

  function numberOfUnskippedTests(module) {
        return collectTests(module).filter(function (test) {
                return !test.skip;
        }).length;
  }

  function notifyTestsRan(module, skipped) {
        module.testsRun++;
        if (!skipped) {
                module.unskippedTestsRun++;
        }
        while (module = module.parentModule) {
                module.testsRun++;
                if (!skipped) {
                        module.unskippedTestsRun++;
                }
        }
  }

  /**
   * Returns a function that proxies to the given method name on the globals
   * console object. The proxy will also detect if the console doesn't exist and
   * will appropriately no-op. This allows support for IE9, which doesn't have a
   * console if the developer tools are not open.
   */
  function consoleProxy(method) {
        return function () {
                if (console) {
                        console[method].apply(console, arguments);
                }
        };
  }

  var Logger = {
        warn: consoleProxy("warn")
  };

  var Assert = function () {
        function Assert(testContext) {
                classCallCheck(this, Assert);

                this.test = testContext;
        }

        // Assert helpers

        createClass(Assert, [{
                key: "timeout",
                value: function timeout(duration) {
                        if (typeof duration !== "number") {
                                throw new Error("You must pass a number as the duration to assert.timeout");
                        }

                        this.test.timeout = duration;
                }

                // Documents a "step", which is a string value, in a test as a passing assertion

        }, {
                key: "step",
                value: function step(message) {
                        var assertionMessage = message;
                        var result = !!message;

                        this.test.steps.push(message);

                        if (objectType(message) === "undefined" || message === "") {
                                assertionMessage = "You must provide a message to assert.step";
                        } else if (objectType(message) !== "string") {
                                assertionMessage = "You must provide a string value to assert.step";
                                result = false;
                        }

                        return this.pushResult({
                                result: result,
                                message: assertionMessage
                        });
                }

                // Verifies the steps in a test match a given array of string values

        }, {
                key: "verifySteps",
                value: function verifySteps(steps, message) {

                        // Since the steps array is just string values, we can clone with slice
                        var actualStepsClone = this.test.steps.slice();
                        this.deepEqual(actualStepsClone, steps, message);
                        this.test.steps.length = 0;
                }

                // Specify the number of expected assertions to guarantee that failed test
                // (no assertions are run at all) don't slip through.

        }, {
                key: "expect",
                value: function expect(asserts) {
                        if (arguments.length === 1) {
                                this.test.expected = asserts;
                        } else {
                                return this.test.expected;
                        }
                }

                // Put a hold on processing and return a function that will release it a maximum of once.

        }, {
                key: "async",
                value: function async(count) {
                        var test$$1 = this.test;

                        var popped = false,
                            acceptCallCount = count;

                        if (typeof acceptCallCount === "undefined") {
                                acceptCallCount = 1;
                        }

                        var resume = internalStop(test$$1);

                        return function done() {
                                if (config.current !== test$$1) {
                                        throw Error("assert.async callback called after test finished.");
                                }

                                if (popped) {
                                        test$$1.pushFailure("Too many calls to the `assert.async` callback", sourceFromStacktrace(2));
                                        return;
                                }

                                acceptCallCount -= 1;
                                if (acceptCallCount > 0) {
                                        return;
                                }

                                popped = true;
                                resume();
                        };
                }

                // Exports test.push() to the user API
                // Alias of pushResult.

        }, {
                key: "push",
                value: function push(result, actual, expected, message, negative) {
                        Logger.warn("assert.push is deprecated and will be removed in QUnit 3.0." + " Please use assert.pushResult instead (https://api.qunitjs.com/assert/pushResult).");

                        var currentAssert = this instanceof Assert ? this : config.current.assert;
                        return currentAssert.pushResult({
                                result: result,
                                actual: actual,
                                expected: expected,
                                message: message,
                                negative: negative
                        });
                }
        }, {
                key: "pushResult",
                value: function pushResult(resultInfo) {

                        // Destructure of resultInfo = { result, actual, expected, message, negative }
                        var assert = this;
                        var currentTest = assert instanceof Assert && assert.test || config.current;

                        // Backwards compatibility fix.
                        // Allows the direct use of global exported assertions and QUnit.assert.*
                        // Although, it's use is not recommended as it can leak assertions
                        // to other tests from async tests, because we only get a reference to the current test,
                        // not exactly the test where assertion were intended to be called.
                        if (!currentTest) {
                                throw new Error("assertion outside test context, in " + sourceFromStacktrace(2));
                        }

                        if (!(assert instanceof Assert)) {
                                assert = currentTest.assert;
                        }

                        return assert.test.pushResult(resultInfo);
                }
        }, {
                key: "ok",
                value: function ok(result, message) {
                        if (!message) {
                                message = result ? "okay" : "failed, expected argument to be truthy, was: " + dump.parse(result);
                        }

                        this.pushResult({
                                result: !!result,
                                actual: result,
                                expected: true,
                                message: message
                        });
                }
        }, {
                key: "notOk",
                value: function notOk(result, message) {
                        if (!message) {
                                message = !result ? "okay" : "failed, expected argument to be falsy, was: " + dump.parse(result);
                        }

                        this.pushResult({
                                result: !result,
                                actual: result,
                                expected: false,
                                message: message
                        });
                }
        }, {
                key: "equal",
                value: function equal(actual, expected, message) {

                        // eslint-disable-next-line eqeqeq
                        var result = expected == actual;

                        this.pushResult({
                                result: result,
                                actual: actual,
                                expected: expected,
                                message: message
                        });
                }
        }, {
                key: "notEqual",
                value: function notEqual(actual, expected, message) {

                        // eslint-disable-next-line eqeqeq
                        var result = expected != actual;

                        this.pushResult({
                                result: result,
                                actual: actual,
                                expected: expected,
                                message: message,
                                negative: true
                        });
                }
        }, {
                key: "propEqual",
                value: function propEqual(actual, expected, message) {
                        actual = objectValues(actual);
                        expected = objectValues(expected);

                        this.pushResult({
                                result: equiv(actual, expected),
                                actual: actual,
                                expected: expected,
                                message: message
                        });
                }
        }, {
                key: "notPropEqual",
                value: function notPropEqual(actual, expected, message) {
                        actual = objectValues(actual);
                        expected = objectValues(expected);

                        this.pushResult({
                                result: !equiv(actual, expected),
                                actual: actual,
                                expected: expected,
                                message: message,
                                negative: true
                        });
                }
        }, {
                key: "deepEqual",
                value: function deepEqual(actual, expected, message) {
                        this.pushResult({
                                result: equiv(actual, expected),
                                actual: actual,
                                expected: expected,
                                message: message
                        });
                }
        }, {
                key: "notDeepEqual",
                value: function notDeepEqual(actual, expected, message) {
                        this.pushResult({
                                result: !equiv(actual, expected),
                                actual: actual,
                                expected: expected,
                                message: message,
                                negative: true
                        });
                }
        }, {
                key: "strictEqual",
                value: function strictEqual(actual, expected, message) {
                        this.pushResult({
                                result: expected === actual,
                                actual: actual,
                                expected: expected,
                                message: message
                        });
                }
        }, {
                key: "notStrictEqual",
                value: function notStrictEqual(actual, expected, message) {
                        this.pushResult({
                                result: expected !== actual,
                                actual: actual,
                                expected: expected,
                                message: message,
                                negative: true
                        });
                }
        }, {
                key: "throws",
                value: function throws(block, expected, message) {
                        var actual = void 0,
                            result = false;

                        var currentTest = this instanceof Assert && this.test || config.current;

                        // 'expected' is optional unless doing string comparison
                        if (objectType(expected) === "string") {
                                if (message == null) {
                                        message = expected;
                                        expected = null;
                                } else {
                                        throw new Error("throws/raises does not accept a string value for the expected argument.\n" + "Use a non-string object value (e.g. regExp) instead if it's necessary.");
                                }
                        }

                        currentTest.ignoreGlobalErrors = true;
                        try {
                                block.call(currentTest.testEnvironment);
                        } catch (e) {
                                actual = e;
                        }
                        currentTest.ignoreGlobalErrors = false;

                        if (actual) {
                                var expectedType = objectType(expected);

                                // We don't want to validate thrown error
                                if (!expected) {
                                        result = true;
                                        expected = null;

                                        // Expected is a regexp
                                } else if (expectedType === "regexp") {
                                        result = expected.test(errorString(actual));

                                        // Expected is a constructor, maybe an Error constructor
                                } else if (expectedType === "function" && actual instanceof expected) {
                                        result = true;

                                        // Expected is an Error object
                                } else if (expectedType === "object") {
                                        result = actual instanceof expected.constructor && actual.name === expected.name && actual.message === expected.message;

                                        // Expected is a validation function which returns true if validation passed
                                } else if (expectedType === "function" && expected.call({}, actual) === true) {
                                        expected = null;
                                        result = true;
                                }
                        }

                        currentTest.assert.pushResult({
                                result: result,
                                actual: actual,
                                expected: expected,
                                message: message
                        });
                }
        }, {
                key: "rejects",
                value: function rejects(promise, expected, message) {
                        var result = false;

                        var currentTest = this instanceof Assert && this.test || config.current;

                        // 'expected' is optional unless doing string comparison
                        if (objectType(expected) === "string") {
                                if (message === undefined) {
                                        message = expected;
                                        expected = undefined;
                                } else {
                                        message = "assert.rejects does not accept a string value for the expected " + "argument.\nUse a non-string object value (e.g. validator function) instead " + "if necessary.";

                                        currentTest.assert.pushResult({
                                                result: false,
                                                message: message
                                        });

                                        return;
                                }
                        }

                        var then = promise && promise.then;
                        if (objectType(then) !== "function") {
                                var _message = "The value provided to `assert.rejects` in " + "\"" + currentTest.testName + "\" was not a promise.";

                                currentTest.assert.pushResult({
                                        result: false,
                                        message: _message,
                                        actual: promise
                                });

                                return;
                        }

                        var done = this.async();

                        return then.call(promise, function handleFulfillment() {
                                var message = "The promise returned by the `assert.rejects` callback in " + "\"" + currentTest.testName + "\" did not reject.";

                                currentTest.assert.pushResult({
                                        result: false,
                                        message: message,
                                        actual: promise
                                });

                                done();
                        }, function handleRejection(actual) {
                                var expectedType = objectType(expected);

                                // We don't want to validate
                                if (expected === undefined) {
                                        result = true;
                                        expected = actual;

                                        // Expected is a regexp
                                } else if (expectedType === "regexp") {
                                        result = expected.test(errorString(actual));

                                        // Expected is a constructor, maybe an Error constructor
                                } else if (expectedType === "function" && actual instanceof expected) {
                                        result = true;

                                        // Expected is an Error object
                                } else if (expectedType === "object") {
                                        result = actual instanceof expected.constructor && actual.name === expected.name && actual.message === expected.message;

                                        // Expected is a validation function which returns true if validation passed
                                } else {
                                        if (expectedType === "function") {
                                                result = expected.call({}, actual) === true;
                                                expected = null;

                                                // Expected is some other invalid type
                                        } else {
                                                result = false;
                                                message = "invalid expected value provided to `assert.rejects` " + "callback in \"" + currentTest.testName + "\": " + expectedType + ".";
                                        }
                                }

                                currentTest.assert.pushResult({
                                        result: result,
                                        actual: actual,
                                        expected: expected,
                                        message: message
                                });

                                done();
                        });
                }
        }]);
        return Assert;
  }();

  // Provide an alternative to assert.throws(), for environments that consider throws a reserved word
  // Known to us are: Closure Compiler, Narwhal
  // eslint-disable-next-line dot-notation


  Assert.prototype.raises = Assert.prototype["throws"];

  /**
   * Converts an error into a simple string for comparisons.
   *
   * @param {Error} error
   * @return {String}
   */
  function errorString(error) {
        var resultErrorString = error.toString();

        if (resultErrorString.substring(0, 7) === "[object") {
                var name = error.name ? error.name.toString() : "Error";
                var message = error.message ? error.message.toString() : "";

                if (name && message) {
                        return name + ": " + message;
                } else if (name) {
                        return name;
                } else if (message) {
                        return message;
                } else {
                        return "Error";
                }
        } else {
                return resultErrorString;
        }
  }

  /* global module, exports, define */
  function exportQUnit(QUnit) {

        if (defined.document) {

                // QUnit may be defined when it is preconfigured but then only QUnit and QUnit.config may be defined.
                if (window.QUnit && window.QUnit.version) {
                        throw new Error("QUnit has already been defined.");
                }

                window.QUnit = QUnit;
        }

        // For nodejs
        if (typeof module !== "undefined" && module && module.exports) {
                module.exports = QUnit;

                // For consistency with CommonJS environments' exports
                module.exports.QUnit = QUnit;
        }

        // For CommonJS with exports, but without module.exports, like Rhino
        if (typeof exports !== "undefined" && exports) {
                exports.QUnit = QUnit;
        }

        if (typeof define === "function" && define.amd) {
                define(function () {
                        return QUnit;
                });
                QUnit.config.autostart = false;
        }

        // For Web/Service Workers
        if (self$1 && self$1.WorkerGlobalScope && self$1 instanceof self$1.WorkerGlobalScope) {
                self$1.QUnit = QUnit;
        }
  }

  var SuiteReport = function () {
        function SuiteReport(name, parentSuite) {
                classCallCheck(this, SuiteReport);

                this.name = name;
                this.fullName = parentSuite ? parentSuite.fullName.concat(name) : [];

                this.tests = [];
                this.childSuites = [];

                if (parentSuite) {
                        parentSuite.pushChildSuite(this);
                }
        }

        createClass(SuiteReport, [{
                key: "start",
                value: function start(recordTime) {
                        if (recordTime) {
                                this._startTime = Date.now();
                        }

                        return {
                                name: this.name,
                                fullName: this.fullName.slice(),
                                tests: this.tests.map(function (test) {
                                        return test.start();
                                }),
                                childSuites: this.childSuites.map(function (suite) {
                                        return suite.start();
                                }),
                                testCounts: {
                                        total: this.getTestCounts().total
                                }
                        };
                }
        }, {
                key: "end",
                value: function end(recordTime) {
                        if (recordTime) {
                                this._endTime = Date.now();
                        }

                        return {
                                name: this.name,
                                fullName: this.fullName.slice(),
                                tests: this.tests.map(function (test) {
                                        return test.end();
                                }),
                                childSuites: this.childSuites.map(function (suite) {
                                        return suite.end();
                                }),
                                testCounts: this.getTestCounts(),
                                runtime: this.getRuntime(),
                                status: this.getStatus()
                        };
                }
        }, {
                key: "pushChildSuite",
                value: function pushChildSuite(suite) {
                        this.childSuites.push(suite);
                }
        }, {
                key: "pushTest",
                value: function pushTest(test) {
                        this.tests.push(test);
                }
        }, {
                key: "getRuntime",
                value: function getRuntime() {
                        return this._endTime - this._startTime;
                }
        }, {
                key: "getTestCounts",
                value: function getTestCounts() {
                        var counts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : { passed: 0, failed: 0, skipped: 0, todo: 0, total: 0 };

                        counts = this.tests.reduce(function (counts, test) {
                                if (test.valid) {
                                        counts[test.getStatus()]++;
                                        counts.total++;
                                }

                                return counts;
                        }, counts);

                        return this.childSuites.reduce(function (counts, suite) {
                                return suite.getTestCounts(counts);
                        }, counts);
                }
        }, {
                key: "getStatus",
                value: function getStatus() {
                        var _getTestCounts = this.getTestCounts(),
                            total = _getTestCounts.total,
                            failed = _getTestCounts.failed,
                            skipped = _getTestCounts.skipped,
                            todo = _getTestCounts.todo;

                        if (failed) {
                                return "failed";
                        } else {
                                if (skipped === total) {
                                        return "skipped";
                                } else if (todo === total) {
                                        return "todo";
                                } else {
                                        return "passed";
                                }
                        }
                }
        }]);
        return SuiteReport;
  }();

  // Handle an unhandled exception. By convention, returns true if further
  // error handling should be suppressed and false otherwise.
  // In this case, we will only suppress further error handling if the
  // "ignoreGlobalErrors" configuration option is enabled.
  function onError(error) {
        for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
                args[_key - 1] = arguments[_key];
        }

        if (config.current) {
                if (config.current.ignoreGlobalErrors) {
                        return true;
                }
                pushFailure.apply(undefined, [error.message, error.fileName + ":" + error.lineNumber].concat(args));
        } else {
                test("global failure", extend(function () {
                        pushFailure.apply(undefined, [error.message, error.fileName + ":" + error.lineNumber].concat(args));
                }, { validTest: true }));
        }

        return false;
  }

  // Handle an unhandled rejection
  function onUnhandledRejection(reason) {
        var resultInfo = {
                result: false,
                message: reason.message || "error",
                actual: reason,
                source: reason.stack || sourceFromStacktrace(3)
        };

        var currentTest = config.current;
        if (currentTest) {
                currentTest.assert.pushResult(resultInfo);
        } else {
                test("global failure", extend(function (assert) {
                        assert.pushResult(resultInfo);
                }, { validTest: true }));
        }
  }

  var focused = false;
  var QUnit = {};
  var globalSuite = new SuiteReport();

  // The initial "currentModule" represents the global (or top-level) module that
  // is not explicitly defined by the user, therefore we add the "globalSuite" to
  // it since each module has a suiteReport associated with it.
  config.currentModule.suiteReport = globalSuite;

  var moduleStack = [];
  var globalStartCalled = false;
  var runStarted = false;

  // Figure out if we're running the tests from a server or not
  QUnit.isLocal = !(defined.document && window.location.protocol !== "file:");

  // Expose the current QUnit version
  QUnit.version = "2.6.0";

  function createModule(name, testEnvironment, modifiers) {
        var parentModule = moduleStack.length ? moduleStack.slice(-1)[0] : null;
        var moduleName = parentModule !== null ? [parentModule.name, name].join(" > ") : name;
        var parentSuite = parentModule ? parentModule.suiteReport : globalSuite;

        var skip$$1 = parentModule !== null && parentModule.skip || modifiers.skip;
        var todo$$1 = parentModule !== null && parentModule.todo || modifiers.todo;

        var module = {
                name: moduleName,
                parentModule: parentModule,
                tests: [],
                moduleId: generateHash(moduleName),
                testsRun: 0,
                unskippedTestsRun: 0,
                childModules: [],
                suiteReport: new SuiteReport(name, parentSuite),

                // Pass along `skip` and `todo` properties from parent module, in case
                // there is one, to childs. And use own otherwise.
                // This property will be used to mark own tests and tests of child suites
                // as either `skipped` or `todo`.
                skip: skip$$1,
                todo: skip$$1 ? false : todo$$1
        };

        var env = {};
        if (parentModule) {
                parentModule.childModules.push(module);
                extend(env, parentModule.testEnvironment);
        }
        extend(env, testEnvironment);
        module.testEnvironment = env;

        config.modules.push(module);
        return module;
  }

  function processModule(name, options, executeNow) {
        var modifiers = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};

        var module = createModule(name, options, modifiers);

        // Move any hooks to a 'hooks' object
        var testEnvironment = module.testEnvironment;
        var hooks = module.hooks = {};

        setHookFromEnvironment(hooks, testEnvironment, "before");
        setHookFromEnvironment(hooks, testEnvironment, "beforeEach");
        setHookFromEnvironment(hooks, testEnvironment, "afterEach");
        setHookFromEnvironment(hooks, testEnvironment, "after");

        function setHookFromEnvironment(hooks, environment, name) {
                var potentialHook = environment[name];
                hooks[name] = typeof potentialHook === "function" ? [potentialHook] : [];
                delete environment[name];
        }

        var moduleFns = {
                before: setHookFunction(module, "before"),
                beforeEach: setHookFunction(module, "beforeEach"),
                afterEach: setHookFunction(module, "afterEach"),
                after: setHookFunction(module, "after")
        };

        var currentModule = config.currentModule;
        if (objectType(executeNow) === "function") {
                moduleStack.push(module);
                config.currentModule = module;
                executeNow.call(module.testEnvironment, moduleFns);
                moduleStack.pop();
                module = module.parentModule || currentModule;
        }

        config.currentModule = module;
  }

  // TODO: extract this to a new file alongside its related functions
  function module$1(name, options, executeNow) {
        if (focused) {
                return;
        }

        if (arguments.length === 2) {
                if (objectType(options) === "function") {
                        executeNow = options;
                        options = undefined;
                }
        }

        processModule(name, options, executeNow);
  }

  module$1.only = function () {
        if (focused) {
                return;
        }

        config.modules.length = 0;
        config.queue.length = 0;

        module$1.apply(undefined, arguments);

        focused = true;
  };

  module$1.skip = function (name, options, executeNow) {
        if (focused) {
                return;
        }

        if (arguments.length === 2) {
                if (objectType(options) === "function") {
                        executeNow = options;
                        options = undefined;
                }
        }

        processModule(name, options, executeNow, { skip: true });
  };

  module$1.todo = function (name, options, executeNow) {
        if (focused) {
                return;
        }

        if (arguments.length === 2) {
                if (objectType(options) === "function") {
                        executeNow = options;
                        options = undefined;
                }
        }

        processModule(name, options, executeNow, { todo: true });
  };

  extend(QUnit, {
        on: on,

        module: module$1,

        test: test,

        todo: todo,

        skip: skip,

        only: only,

        start: function start(count) {
                var globalStartAlreadyCalled = globalStartCalled;

                if (!config.current) {
                        globalStartCalled = true;

                        if (runStarted) {
                                throw new Error("Called start() while test already started running");
                        } else if (globalStartAlreadyCalled || count > 1) {
                                throw new Error("Called start() outside of a test context too many times");
                        } else if (config.autostart) {
                                throw new Error("Called start() outside of a test context when " + "QUnit.config.autostart was true");
                        } else if (!config.pageLoaded) {

                                // The page isn't completely loaded yet, so we set autostart and then
                                // load if we're in Node or wait for the browser's load event.
                                config.autostart = true;

                                // Starts from Node even if .load was not previously called. We still return
                                // early otherwise we'll wind up "beginning" twice.
                                if (!defined.document) {
                                        QUnit.load();
                                }

                                return;
                        }
                } else {
                        throw new Error("QUnit.start cannot be called inside a test context.");
                }

                scheduleBegin();
        },

        config: config,

        is: is,

        objectType: objectType,

        extend: extend,

        load: function load() {
                config.pageLoaded = true;

                // Initialize the configuration options
                extend(config, {
                        stats: { all: 0, bad: 0 },
                        started: 0,
                        updateRate: 1000,
                        autostart: true,
                        filter: ""
                }, true);

                if (!runStarted) {
                        config.blocking = false;

                        if (config.autostart) {
                                scheduleBegin();
                        }
                }
        },

        stack: function stack(offset) {
                offset = (offset || 0) + 2;
                return sourceFromStacktrace(offset);
        },

        onError: onError,

        onUnhandledRejection: onUnhandledRejection
  });

  QUnit.pushFailure = pushFailure;
  QUnit.assert = Assert.prototype;
  QUnit.equiv = equiv;
  QUnit.dump = dump;

  registerLoggingCallbacks(QUnit);

  function scheduleBegin() {

        runStarted = true;

        // Add a slight delay to allow definition of more modules and tests.
        if (defined.setTimeout) {
                setTimeout(function () {
                        begin();
                });
        } else {
                begin();
        }
  }

  function begin() {
        var i,
            l,
            modulesLog = [];

        // If the test run hasn't officially begun yet
        if (!config.started) {

                // Record the time of the test run's beginning
                config.started = now();

                // Delete the loose unnamed module if unused.
                if (config.modules[0].name === "" && config.modules[0].tests.length === 0) {
                        config.modules.shift();
                }

                // Avoid unnecessary information by not logging modules' test environments
                for (i = 0, l = config.modules.length; i < l; i++) {
                        modulesLog.push({
                                name: config.modules[i].name,
                                tests: config.modules[i].tests
                        });
                }

                // The test run is officially beginning now
                emit("runStart", globalSuite.start(true));
                runLoggingCallbacks("begin", {
                        totalTests: Test.count,
                        modules: modulesLog
                });
        }

        config.blocking = false;
        ProcessingQueue.advance();
  }

  function setHookFunction(module, hookName) {
        return function setHook(callback) {
                module.hooks[hookName].push(callback);
        };
  }

  exportQUnit(QUnit);

  (function () {

        if (typeof window === "undefined" || typeof document === "undefined") {
                return;
        }

        var config = QUnit.config,
            hasOwn = Object.prototype.hasOwnProperty;

        // Stores fixture HTML for resetting later
        function storeFixture() {

                // Avoid overwriting user-defined values
                if (hasOwn.call(config, "fixture")) {
                        return;
                }

                var fixture = document.getElementById("qunit-fixture");
                if (fixture) {
                        config.fixture = fixture.cloneNode(true);
                }
        }

        QUnit.begin(storeFixture);

        // Resets the fixture DOM element if available.
        function resetFixture() {
                if (config.fixture == null) {
                        return;
                }

                var fixture = document.getElementById("qunit-fixture");
                var resetFixtureType = _typeof(config.fixture);
                if (resetFixtureType === "string") {

                        // support user defined values for `config.fixture`
                        var newFixture = document.createElement("div");
                        newFixture.setAttribute("id", "qunit-fixture");
                        newFixture.innerHTML = config.fixture;
                        fixture.parentNode.replaceChild(newFixture, fixture);
                } else {
                        var clonedFixture = config.fixture.cloneNode(true);
                        fixture.parentNode.replaceChild(clonedFixture, fixture);
                }
        }

        QUnit.testStart(resetFixture);
  })();

  (function () {

        // Only interact with URLs via window.location
        var location = typeof window !== "undefined" && window.location;
        if (!location) {
                return;
        }

        var urlParams = getUrlParams();

        QUnit.urlParams = urlParams;

        // Match module/test by inclusion in an array
        QUnit.config.moduleId = [].concat(urlParams.moduleId || []);
        QUnit.config.testId = [].concat(urlParams.testId || []);

        // Exact case-insensitive match of the module name
        QUnit.config.module = urlParams.module;

        // Regular expression or case-insenstive substring match against "moduleName: testName"
        QUnit.config.filter = urlParams.filter;

        // Test order randomization
        if (urlParams.seed === true) {

                // Generate a random seed if the option is specified without a value
                QUnit.config.seed = Math.random().toString(36).slice(2);
        } else if (urlParams.seed) {
                QUnit.config.seed = urlParams.seed;
        }

        // Add URL-parameter-mapped config values with UI form rendering data
        QUnit.config.urlConfig.push({
                id: "hidepassed",
                label: "Hide passed tests",
                tooltip: "Only show tests and assertions that fail. Stored as query-strings."
        }, {
                id: "noglobals",
                label: "Check for Globals",
                tooltip: "Enabling this will test if any test introduces new properties on the " + "global object (`window` in Browsers). Stored as query-strings."
        }, {
                id: "notrycatch",
                label: "No try-catch",
                tooltip: "Enabling this will run tests outside of a try-catch block. Makes debugging " + "exceptions in IE reasonable. Stored as query-strings."
        });

        QUnit.begin(function () {
                var i,
                    option,
                    urlConfig = QUnit.config.urlConfig;

                for (i = 0; i < urlConfig.length; i++) {

                        // Options can be either strings or objects with nonempty "id" properties
                        option = QUnit.config.urlConfig[i];
                        if (typeof option !== "string") {
                                option = option.id;
                        }

                        if (QUnit.config[option] === undefined) {
                                QUnit.config[option] = urlParams[option];
                        }
                }
        });

        function getUrlParams() {
                var i, param, name, value;
                var urlParams = Object.create(null);
                var params = location.search.slice(1).split("&");
                var length = params.length;

                for (i = 0; i < length; i++) {
                        if (params[i]) {
                                param = params[i].split("=");
                                name = decodeQueryParam(param[0]);

                                // Allow just a key to turn on a flag, e.g., test.html?noglobals
                                value = param.length === 1 || decodeQueryParam(param.slice(1).join("="));
                                if (name in urlParams) {
                                        urlParams[name] = [].concat(urlParams[name], value);
                                } else {
                                        urlParams[name] = value;
                                }
                        }
                }

                return urlParams;
        }

        function decodeQueryParam(param) {
                return decodeURIComponent(param.replace(/\+/g, "%20"));
        }
  })();

  var stats = {
        passedTests: 0,
        failedTests: 0,
        skippedTests: 0,
        todoTests: 0
  };

  // Escape text for attribute or text content.
  function escapeText(s) {
        if (!s) {
                return "";
        }
        s = s + "";

        // Both single quotes and double quotes (for attributes)
        return s.replace(/['"<>&]/g, function (s) {
                switch (s) {
                        case "'":
                                return "&#039;";
                        case "\"":
                                return "&quot;";
                        case "<":
                                return "&lt;";
                        case ">":
                                return "&gt;";
                        case "&":
                                return "&amp;";
                }
        });
  }

  (function () {

        // Don't load the HTML Reporter on non-browser environments
        if (typeof window === "undefined" || !window.document) {
                return;
        }

        var config = QUnit.config,
            document$$1 = window.document,
            collapseNext = false,
            hasOwn = Object.prototype.hasOwnProperty,
            unfilteredUrl = setUrl({ filter: undefined, module: undefined,
                moduleId: undefined, testId: undefined }),
            modulesList = [];

        function addEvent(elem, type, fn) {
                elem.addEventListener(type, fn, false);
        }

        function removeEvent(elem, type, fn) {
                elem.removeEventListener(type, fn, false);
        }

        function addEvents(elems, type, fn) {
                var i = elems.length;
                while (i--) {
                        addEvent(elems[i], type, fn);
                }
        }

        function hasClass(elem, name) {
                return (" " + elem.className + " ").indexOf(" " + name + " ") >= 0;
        }

        function addClass(elem, name) {
                if (!hasClass(elem, name)) {
                        elem.className += (elem.className ? " " : "") + name;
                }
        }

        function toggleClass(elem, name, force) {
                if (force || typeof force === "undefined" && !hasClass(elem, name)) {
                        addClass(elem, name);
                } else {
                        removeClass(elem, name);
                }
        }

        function removeClass(elem, name) {
                var set = " " + elem.className + " ";

                // Class name may appear multiple times
                while (set.indexOf(" " + name + " ") >= 0) {
                        set = set.replace(" " + name + " ", " ");
                }

                // Trim for prettiness
                elem.className = typeof set.trim === "function" ? set.trim() : set.replace(/^\s+|\s+$/g, "");
        }

        function id(name) {
                return document$$1.getElementById && document$$1.getElementById(name);
        }

        function abortTests() {
                var abortButton = id("qunit-abort-tests-button");
                if (abortButton) {
                        abortButton.disabled = true;
                        abortButton.innerHTML = "Aborting...";
                }
                QUnit.config.queue.length = 0;
                return false;
        }

        function interceptNavigation(ev) {
                applyUrlParams();

                if (ev && ev.preventDefault) {
                        ev.preventDefault();
                }

                return false;
        }

        function getUrlConfigHtml() {
                var i,
                    j,
                    val,
                    escaped,
                    escapedTooltip,
                    selection = false,
                    urlConfig = config.urlConfig,
                    urlConfigHtml = "";

                for (i = 0; i < urlConfig.length; i++) {

                        // Options can be either strings or objects with nonempty "id" properties
                        val = config.urlConfig[i];
                        if (typeof val === "string") {
                                val = {
                                        id: val,
                                        label: val
                                };
                        }

                        escaped = escapeText(val.id);
                        escapedTooltip = escapeText(val.tooltip);

                        if (!val.value || typeof val.value === "string") {
                                urlConfigHtml += "<label for='qunit-urlconfig-" + escaped + "' title='" + escapedTooltip + "'><input id='qunit-urlconfig-" + escaped + "' name='" + escaped + "' type='checkbox'" + (val.value ? " value='" + escapeText(val.value) + "'" : "") + (config[val.id] ? " checked='checked'" : "") + " title='" + escapedTooltip + "' />" + escapeText(val.label) + "</label>";
                        } else {
                                urlConfigHtml += "<label for='qunit-urlconfig-" + escaped + "' title='" + escapedTooltip + "'>" + val.label + ": </label><select id='qunit-urlconfig-" + escaped + "' name='" + escaped + "' title='" + escapedTooltip + "'><option></option>";

                                if (QUnit.is("array", val.value)) {
                                        for (j = 0; j < val.value.length; j++) {
                                                escaped = escapeText(val.value[j]);
                                                urlConfigHtml += "<option value='" + escaped + "'" + (config[val.id] === val.value[j] ? (selection = true) && " selected='selected'" : "") + ">" + escaped + "</option>";
                                        }
                                } else {
                                        for (j in val.value) {
                                                if (hasOwn.call(val.value, j)) {
                                                        urlConfigHtml += "<option value='" + escapeText(j) + "'" + (config[val.id] === j ? (selection = true) && " selected='selected'" : "") + ">" + escapeText(val.value[j]) + "</option>";
                                                }
                                        }
                                }
                                if (config[val.id] && !selection) {
                                        escaped = escapeText(config[val.id]);
                                        urlConfigHtml += "<option value='" + escaped + "' selected='selected' disabled='disabled'>" + escaped + "</option>";
                                }
                                urlConfigHtml += "</select>";
                        }
                }

                return urlConfigHtml;
        }

        // Handle "click" events on toolbar checkboxes and "change" for select menus.
        // Updates the URL with the new state of `config.urlConfig` values.
        function toolbarChanged() {
                var updatedUrl,
                    value,
                    tests,
                    field = this,
                    params = {};

                // Detect if field is a select menu or a checkbox
                if ("selectedIndex" in field) {
                        value = field.options[field.selectedIndex].value || undefined;
                } else {
                        value = field.checked ? field.defaultValue || true : undefined;
                }

                params[field.name] = value;
                updatedUrl = setUrl(params);

                // Check if we can apply the change without a page refresh
                if ("hidepassed" === field.name && "replaceState" in window.history) {
                        QUnit.urlParams[field.name] = value;
                        config[field.name] = value || false;
                        tests = id("qunit-tests");
                        if (tests) {
                                toggleClass(tests, "hidepass", value || false);
                        }
                        window.history.replaceState(null, "", updatedUrl);
                } else {
                        window.location = updatedUrl;
                }
        }

        function setUrl(params) {
                var key,
                    arrValue,
                    i,
                    querystring = "?",
                    location = window.location;

                params = QUnit.extend(QUnit.extend({}, QUnit.urlParams), params);

                for (key in params) {

                        // Skip inherited or undefined properties
                        if (hasOwn.call(params, key) && params[key] !== undefined) {

                                // Output a parameter for each value of this key
                                // (but usually just one)
                                arrValue = [].concat(params[key]);
                                for (i = 0; i < arrValue.length; i++) {
                                        querystring += encodeURIComponent(key);
                                        if (arrValue[i] !== true) {
                                                querystring += "=" + encodeURIComponent(arrValue[i]);
                                        }
                                        querystring += "&";
                                }
                        }
                }
                return location.protocol + "//" + location.host + location.pathname + querystring.slice(0, -1);
        }

        function applyUrlParams() {
                var i,
                    selectedModules = [],
                    modulesList = id("qunit-modulefilter-dropdown-list").getElementsByTagName("input"),
                    filter = id("qunit-filter-input").value;

                for (i = 0; i < modulesList.length; i++) {
                        if (modulesList[i].checked) {
                                selectedModules.push(modulesList[i].value);
                        }
                }

                window.location = setUrl({
                        filter: filter === "" ? undefined : filter,
                        moduleId: selectedModules.length === 0 ? undefined : selectedModules,

                        // Remove module and testId filter
                        module: undefined,
                        testId: undefined
                });
        }

        function toolbarUrlConfigContainer() {
                var urlConfigContainer = document$$1.createElement("span");

                urlConfigContainer.innerHTML = getUrlConfigHtml();
                addClass(urlConfigContainer, "qunit-url-config");

                addEvents(urlConfigContainer.getElementsByTagName("input"), "change", toolbarChanged);
                addEvents(urlConfigContainer.getElementsByTagName("select"), "change", toolbarChanged);

                return urlConfigContainer;
        }

        function abortTestsButton() {
                var button = document$$1.createElement("button");
                button.id = "qunit-abort-tests-button";
                button.innerHTML = "Abort";
                addEvent(button, "click", abortTests);
                return button;
        }

        function toolbarLooseFilter() {
                var filter = document$$1.createElement("form"),
                    label = document$$1.createElement("label"),
                    input = document$$1.createElement("input"),
                    button = document$$1.createElement("button");

                addClass(filter, "qunit-filter");

                label.innerHTML = "Filter: ";

                input.type = "text";
                input.value = config.filter || "";
                input.name = "filter";
                input.id = "qunit-filter-input";

                button.innerHTML = "Go";

                label.appendChild(input);

                filter.appendChild(label);
                filter.appendChild(document$$1.createTextNode(" "));
                filter.appendChild(button);
                addEvent(filter, "submit", interceptNavigation);

                return filter;
        }

        function moduleListHtml() {
                var i,
                    checked,
                    html = "";

                for (i = 0; i < config.modules.length; i++) {
                        if (config.modules[i].name !== "") {
                                checked = config.moduleId.indexOf(config.modules[i].moduleId) > -1;
                                html += "<li><label class='clickable" + (checked ? " checked" : "") + "'><input type='checkbox' " + "value='" + config.modules[i].moduleId + "'" + (checked ? " checked='checked'" : "") + " />" + escapeText(config.modules[i].name) + "</label></li>";
                        }
                }

                return html;
        }

        function toolbarModuleFilter() {
                var allCheckbox,
                    commit,
                    reset,
                    moduleFilter = document$$1.createElement("form"),
                    label = document$$1.createElement("label"),
                    moduleSearch = document$$1.createElement("input"),
                    dropDown = document$$1.createElement("div"),
                    actions = document$$1.createElement("span"),
                    dropDownList = document$$1.createElement("ul"),
                    dirty = false;

                moduleSearch.id = "qunit-modulefilter-search";
                addEvent(moduleSearch, "input", searchInput);
                addEvent(moduleSearch, "input", searchFocus);
                addEvent(moduleSearch, "focus", searchFocus);
                addEvent(moduleSearch, "click", searchFocus);

                label.id = "qunit-modulefilter-search-container";
                label.innerHTML = "Module: ";
                label.appendChild(moduleSearch);

                actions.id = "qunit-modulefilter-actions";
                actions.innerHTML = "<button style='display:none'>Apply</button>" + "<button type='reset' style='display:none'>Reset</button>" + "<label class='clickable" + (config.moduleId.length ? "" : " checked") + "'><input type='checkbox'" + (config.moduleId.length ? "" : " checked='checked'") + ">All modules</label>";
                allCheckbox = actions.lastChild.firstChild;
                commit = actions.firstChild;
                reset = commit.nextSibling;
                addEvent(commit, "click", applyUrlParams);

                dropDownList.id = "qunit-modulefilter-dropdown-list";
                dropDownList.innerHTML = moduleListHtml();

                dropDown.id = "qunit-modulefilter-dropdown";
                dropDown.style.display = "none";
                dropDown.appendChild(actions);
                dropDown.appendChild(dropDownList);
                addEvent(dropDown, "change", selectionChange);
                selectionChange();

                moduleFilter.id = "qunit-modulefilter";
                moduleFilter.appendChild(label);
                moduleFilter.appendChild(dropDown);
                addEvent(moduleFilter, "submit", interceptNavigation);
                addEvent(moduleFilter, "reset", function () {

                        // Let the reset happen, then update styles
                        window.setTimeout(selectionChange);
                });

                // Enables show/hide for the dropdown
                function searchFocus() {
                        if (dropDown.style.display !== "none") {
                                return;
                        }

                        dropDown.style.display = "block";
                        addEvent(document$$1, "click", hideHandler);
                        addEvent(document$$1, "keydown", hideHandler);

                        // Hide on Escape keydown or outside-container click
                        function hideHandler(e) {
                                var inContainer = moduleFilter.contains(e.target);

                                if (e.keyCode === 27 || !inContainer) {
                                        if (e.keyCode === 27 && inContainer) {
                                                moduleSearch.focus();
                                        }
                                        dropDown.style.display = "none";
                                        removeEvent(document$$1, "click", hideHandler);
                                        removeEvent(document$$1, "keydown", hideHandler);
                                        moduleSearch.value = "";
                                        searchInput();
                                }
                        }
                }

                // Processes module search box input
                function searchInput() {
                        var i,
                            item,
                            searchText = moduleSearch.value.toLowerCase(),
                            listItems = dropDownList.children;

                        for (i = 0; i < listItems.length; i++) {
                                item = listItems[i];
                                if (!searchText || item.textContent.toLowerCase().indexOf(searchText) > -1) {
                                        item.style.display = "";
                                } else {
                                        item.style.display = "none";
                                }
                        }
                }

                // Processes selection changes
                function selectionChange(evt) {
                        var i,
                            item,
                            checkbox = evt && evt.target || allCheckbox,
                            modulesList = dropDownList.getElementsByTagName("input"),
                            selectedNames = [];

                        toggleClass(checkbox.parentNode, "checked", checkbox.checked);

                        dirty = false;
                        if (checkbox.checked && checkbox !== allCheckbox) {
                                allCheckbox.checked = false;
                                removeClass(allCheckbox.parentNode, "checked");
                        }
                        for (i = 0; i < modulesList.length; i++) {
                                item = modulesList[i];
                                if (!evt) {
                                        toggleClass(item.parentNode, "checked", item.checked);
                                } else if (checkbox === allCheckbox && checkbox.checked) {
                                        item.checked = false;
                                        removeClass(item.parentNode, "checked");
                                }
                                dirty = dirty || item.checked !== item.defaultChecked;
                                if (item.checked) {
                                        selectedNames.push(item.parentNode.textContent);
                                }
                        }

                        commit.style.display = reset.style.display = dirty ? "" : "none";
                        moduleSearch.placeholder = selectedNames.join(", ") || allCheckbox.parentNode.textContent;
                        moduleSearch.title = "Type to filter list. Current selection:\n" + (selectedNames.join("\n") || allCheckbox.parentNode.textContent);
                }

                return moduleFilter;
        }

        function appendToolbar() {
                var toolbar = id("qunit-testrunner-toolbar");

                if (toolbar) {
                        toolbar.appendChild(toolbarUrlConfigContainer());
                        toolbar.appendChild(toolbarModuleFilter());
                        toolbar.appendChild(toolbarLooseFilter());
                        toolbar.appendChild(document$$1.createElement("div")).className = "clearfix";
                }
        }

        function appendHeader() {
                var header = id("qunit-header");

                if (header) {
                        header.innerHTML = "<a href='" + escapeText(unfilteredUrl) + "'>" + header.innerHTML + "</a> ";
                }
        }

        function appendBanner() {
                var banner = id("qunit-banner");

                if (banner) {
                        banner.className = "";
                }
        }

        function appendTestResults() {
                var tests = id("qunit-tests"),
                    result = id("qunit-testresult"),
                    controls;

                if (result) {
                        result.parentNode.removeChild(result);
                }

                if (tests) {
                        tests.innerHTML = "";
                        result = document$$1.createElement("p");
                        result.id = "qunit-testresult";
                        result.className = "result";
                        tests.parentNode.insertBefore(result, tests);
                        result.innerHTML = "<div id=\"qunit-testresult-display\">Running...<br />&#160;</div>" + "<div id=\"qunit-testresult-controls\"></div>" + "<div class=\"clearfix\"></div>";
                        controls = id("qunit-testresult-controls");
                }

                if (controls) {
                        controls.appendChild(abortTestsButton());
                }
        }

        function appendFilteredTest() {
                var testId = QUnit.config.testId;
                if (!testId || testId.length <= 0) {
                        return "";
                }
                return "<div id='qunit-filteredTest'>Rerunning selected tests: " + escapeText(testId.join(", ")) + " <a id='qunit-clearFilter' href='" + escapeText(unfilteredUrl) + "'>Run all tests</a></div>";
        }

        function appendUserAgent() {
                var userAgent = id("qunit-userAgent");

                if (userAgent) {
                        userAgent.innerHTML = "";
                        userAgent.appendChild(document$$1.createTextNode("QUnit " + QUnit.version + "; " + navigator.userAgent));
                }
        }

        function appendInterface() {
                var qunit = id("qunit");

                if (qunit) {
                        qunit.innerHTML = "<h1 id='qunit-header'>" + escapeText(document$$1.title) + "</h1>" + "<h2 id='qunit-banner'></h2>" + "<div id='qunit-testrunner-toolbar'></div>" + appendFilteredTest() + "<h2 id='qunit-userAgent'></h2>" + "<ol id='qunit-tests'></ol>";
                }

                appendHeader();
                appendBanner();
                appendTestResults();
                appendUserAgent();
                appendToolbar();
        }

        function appendTestsList(modules) {
                var i, l, x, z, test, moduleObj;

                for (i = 0, l = modules.length; i < l; i++) {
                        moduleObj = modules[i];

                        for (x = 0, z = moduleObj.tests.length; x < z; x++) {
                                test = moduleObj.tests[x];

                                appendTest(test.name, test.testId, moduleObj.name);
                        }
                }
        }

        function appendTest(name, testId, moduleName) {
                var title,
                    rerunTrigger,
                    testBlock,
                    assertList,
                    tests = id("qunit-tests");

                if (!tests) {
                        return;
                }

                title = document$$1.createElement("strong");
                title.innerHTML = getNameHtml(name, moduleName);

                rerunTrigger = document$$1.createElement("a");
                rerunTrigger.innerHTML = "Rerun";
                rerunTrigger.href = setUrl({ testId: testId });

                testBlock = document$$1.createElement("li");
                testBlock.appendChild(title);
                testBlock.appendChild(rerunTrigger);
                testBlock.id = "qunit-test-output-" + testId;

                assertList = document$$1.createElement("ol");
                assertList.className = "qunit-assert-list";

                testBlock.appendChild(assertList);

                tests.appendChild(testBlock);
        }

        // HTML Reporter initialization and load
        QUnit.begin(function (details) {
                var i, moduleObj, tests;

                // Sort modules by name for the picker
                for (i = 0; i < details.modules.length; i++) {
                        moduleObj = details.modules[i];
                        if (moduleObj.name) {
                                modulesList.push(moduleObj.name);
                        }
                }
                modulesList.sort(function (a, b) {
                        return a.localeCompare(b);
                });

                // Initialize QUnit elements
                appendInterface();
                appendTestsList(details.modules);
                tests = id("qunit-tests");
                if (tests && config.hidepassed) {
                        addClass(tests, "hidepass");
                }
        });

        QUnit.done(function (details) {
                var banner = id("qunit-banner"),
                    tests = id("qunit-tests"),
                    abortButton = id("qunit-abort-tests-button"),
                    totalTests = stats.passedTests + stats.skippedTests + stats.todoTests + stats.failedTests,
                    html = [totalTests, " tests completed in ", details.runtime, " milliseconds, with ", stats.failedTests, " failed, ", stats.skippedTests, " skipped, and ", stats.todoTests, " todo.<br />", "<span class='passed'>", details.passed, "</span> assertions of <span class='total'>", details.total, "</span> passed, <span class='failed'>", details.failed, "</span> failed."].join(""),
                    test,
                    assertLi,
                    assertList;

                // Update remaing tests to aborted
                if (abortButton && abortButton.disabled) {
                        html = "Tests aborted after " + details.runtime + " milliseconds.";

                        for (var i = 0; i < tests.children.length; i++) {
                                test = tests.children[i];
                                if (test.className === "" || test.className === "running") {
                                        test.className = "aborted";
                                        assertList = test.getElementsByTagName("ol")[0];
                                        assertLi = document$$1.createElement("li");
                                        assertLi.className = "fail";
                                        assertLi.innerHTML = "Test aborted.";
                                        assertList.appendChild(assertLi);
                                }
                        }
                }

                if (banner && (!abortButton || abortButton.disabled === false)) {
                        banner.className = stats.failedTests ? "qunit-fail" : "qunit-pass";
                }

                if (abortButton) {
                        abortButton.parentNode.removeChild(abortButton);
                }

                if (tests) {
                        id("qunit-testresult-display").innerHTML = html;
                }

                if (config.altertitle && document$$1.title) {

                        // Show ✖ for good, ✔ for bad suite result in title
                        // use escape sequences in case file gets loaded with non-utf-8
                        // charset
                        document$$1.title = [stats.failedTests ? "\u2716" : "\u2714", document$$1.title.replace(/^[\u2714\u2716] /i, "")].join(" ");
                }

                // Scroll back to top to show results
                if (config.scrolltop && window.scrollTo) {
                        window.scrollTo(0, 0);
                }
        });

        function getNameHtml(name, module) {
                var nameHtml = "";

                if (module) {
                        nameHtml = "<span class='module-name'>" + escapeText(module) + "</span>: ";
                }

                nameHtml += "<span class='test-name'>" + escapeText(name) + "</span>";

                return nameHtml;
        }

        QUnit.testStart(function (details) {
                var running, testBlock, bad;

                testBlock = id("qunit-test-output-" + details.testId);
                if (testBlock) {
                        testBlock.className = "running";
                } else {

                        // Report later registered tests
                        appendTest(details.name, details.testId, details.module);
                }

                running = id("qunit-testresult-display");
                if (running) {
                        bad = QUnit.config.reorder && details.previousFailure;

                        running.innerHTML = [bad ? "Rerunning previously failed test: <br />" : "Running: <br />", getNameHtml(details.name, details.module)].join("");
                }
        });

        function stripHtml(string) {

                // Strip tags, html entity and whitespaces
                return string.replace(/<\/?[^>]+(>|$)/g, "").replace(/\&quot;/g, "").replace(/\s+/g, "");
        }

        QUnit.log(function (details) {
                var assertList,
                    assertLi,
                    message,
                    expected,
                    actual,
                    diff,
                    showDiff = false,
                    testItem = id("qunit-test-output-" + details.testId);

                if (!testItem) {
                        return;
                }

                message = escapeText(details.message) || (details.result ? "okay" : "failed");
                message = "<span class='test-message'>" + message + "</span>";
                message += "<span class='runtime'>@ " + details.runtime + " ms</span>";

                // The pushFailure doesn't provide details.expected
                // when it calls, it's implicit to also not show expected and diff stuff
                // Also, we need to check details.expected existence, as it can exist and be undefined
                if (!details.result && hasOwn.call(details, "expected")) {
                        if (details.negative) {
                                expected = "NOT " + QUnit.dump.parse(details.expected);
                        } else {
                                expected = QUnit.dump.parse(details.expected);
                        }

                        actual = QUnit.dump.parse(details.actual);
                        message += "<table><tr class='test-expected'><th>Expected: </th><td><pre>" + escapeText(expected) + "</pre></td></tr>";

                        if (actual !== expected) {

                                message += "<tr class='test-actual'><th>Result: </th><td><pre>" + escapeText(actual) + "</pre></td></tr>";

                                if (typeof details.actual === "number" && typeof details.expected === "number") {
                                        if (!isNaN(details.actual) && !isNaN(details.expected)) {
                                                showDiff = true;
                                                diff = details.actual - details.expected;
                                                diff = (diff > 0 ? "+" : "") + diff;
                                        }
                                } else if (typeof details.actual !== "boolean" && typeof details.expected !== "boolean") {
                                        diff = QUnit.diff(expected, actual);

                                        // don't show diff if there is zero overlap
                                        showDiff = stripHtml(diff).length !== stripHtml(expected).length + stripHtml(actual).length;
                                }

                                if (showDiff) {
                                        message += "<tr class='test-diff'><th>Diff: </th><td><pre>" + diff + "</pre></td></tr>";
                                }
                        } else if (expected.indexOf("[object Array]") !== -1 || expected.indexOf("[object Object]") !== -1) {
                                message += "<tr class='test-message'><th>Message: </th><td>" + "Diff suppressed as the depth of object is more than current max depth (" + QUnit.config.maxDepth + ").<p>Hint: Use <code>QUnit.dump.maxDepth</code> to " + " run with a higher max depth or <a href='" + escapeText(setUrl({ maxDepth: -1 })) + "'>" + "Rerun</a> without max depth.</p></td></tr>";
                        } else {
                                message += "<tr class='test-message'><th>Message: </th><td>" + "Diff suppressed as the expected and actual results have an equivalent" + " serialization</td></tr>";
                        }

                        if (details.source) {
                                message += "<tr class='test-source'><th>Source: </th><td><pre>" + escapeText(details.source) + "</pre></td></tr>";
                        }

                        message += "</table>";

                        // This occurs when pushFailure is set and we have an extracted stack trace
                } else if (!details.result && details.source) {
                        message += "<table>" + "<tr class='test-source'><th>Source: </th><td><pre>" + escapeText(details.source) + "</pre></td></tr>" + "</table>";
                }

                assertList = testItem.getElementsByTagName("ol")[0];

                assertLi = document$$1.createElement("li");
                assertLi.className = details.result ? "pass" : "fail";
                assertLi.innerHTML = message;
                assertList.appendChild(assertLi);
        });

        QUnit.testDone(function (details) {
                var testTitle,
                    time,
                    testItem,
                    assertList,
                    good,
                    bad,
                    testCounts,
                    skipped,
                    sourceName,
                    tests = id("qunit-tests");

                if (!tests) {
                        return;
                }

                testItem = id("qunit-test-output-" + details.testId);

                assertList = testItem.getElementsByTagName("ol")[0];

                good = details.passed;
                bad = details.failed;

                // This test passed if it has no unexpected failed assertions
                var testPassed = details.failed > 0 ? details.todo : !details.todo;

                if (testPassed) {

                        // Collapse the passing tests
                        addClass(assertList, "qunit-collapsed");
                } else if (config.collapse) {
                        if (!collapseNext) {

                                // Skip collapsing the first failing test
                                collapseNext = true;
                        } else {

                                // Collapse remaining tests
                                addClass(assertList, "qunit-collapsed");
                        }
                }

                // The testItem.firstChild is the test name
                testTitle = testItem.firstChild;

                testCounts = bad ? "<b class='failed'>" + bad + "</b>, " + "<b class='passed'>" + good + "</b>, " : "";

                testTitle.innerHTML += " <b class='counts'>(" + testCounts + details.assertions.length + ")</b>";

                if (details.skipped) {
                        stats.skippedTests++;

                        testItem.className = "skipped";
                        skipped = document$$1.createElement("em");
                        skipped.className = "qunit-skipped-label";
                        skipped.innerHTML = "skipped";
                        testItem.insertBefore(skipped, testTitle);
                } else {
                        addEvent(testTitle, "click", function () {
                                toggleClass(assertList, "qunit-collapsed");
                        });

                        testItem.className = testPassed ? "pass" : "fail";

                        if (details.todo) {
                                var todoLabel = document$$1.createElement("em");
                                todoLabel.className = "qunit-todo-label";
                                todoLabel.innerHTML = "todo";
                                testItem.className += " todo";
                                testItem.insertBefore(todoLabel, testTitle);
                        }

                        time = document$$1.createElement("span");
                        time.className = "runtime";
                        time.innerHTML = details.runtime + " ms";
                        testItem.insertBefore(time, assertList);

                        if (!testPassed) {
                                stats.failedTests++;
                        } else if (details.todo) {
                                stats.todoTests++;
                        } else {
                                stats.passedTests++;
                        }
                }

                // Show the source of the test when showing assertions
                if (details.source) {
                        sourceName = document$$1.createElement("p");
                        sourceName.innerHTML = "<strong>Source: </strong>" + details.source;
                        addClass(sourceName, "qunit-source");
                        if (testPassed) {
                                addClass(sourceName, "qunit-collapsed");
                        }
                        addEvent(testTitle, "click", function () {
                                toggleClass(sourceName, "qunit-collapsed");
                        });
                        testItem.appendChild(sourceName);
                }
        });

        // Avoid readyState issue with phantomjs
        // Ref: #818
        var notPhantom = function (p) {
                return !(p && p.version && p.version.major > 0);
        }(window.phantom);

        if (notPhantom && document$$1.readyState === "complete") {
                QUnit.load();
        } else {
                addEvent(window, "load", QUnit.load);
        }

        // Wrap window.onerror. We will call the original window.onerror to see if
        // the existing handler fully handles the error; if not, we will call the
        // QUnit.onError function.
        var originalWindowOnError = window.onerror;

        // Cover uncaught exceptions
        // Returning true will suppress the default browser handler,
        // returning false will let it run.
        window.onerror = function (message, fileName, lineNumber) {
                var ret = false;
                if (originalWindowOnError) {
                        for (var _len = arguments.length, args = Array(_len > 3 ? _len - 3 : 0), _key = 3; _key < _len; _key++) {
                                args[_key - 3] = arguments[_key];
                        }

                        ret = originalWindowOnError.call.apply(originalWindowOnError, [this, message, fileName, lineNumber].concat(args));
                }

                // Treat return value as window.onerror itself does,
                // Only do our handling if not suppressed.
                if (ret !== true) {
                        var error = {
                                message: message,
                                fileName: fileName,
                                lineNumber: lineNumber
                        };

                        ret = QUnit.onError(error);
                }

                return ret;
        };

        // Listen for unhandled rejections, and call QUnit.onUnhandledRejection
        window.addEventListener("unhandledrejection", function (event) {
                QUnit.onUnhandledRejection(event.reason);
        });
  })();

  /*
   * This file is a modified version of google-diff-match-patch's JavaScript implementation
   * (https://code.google.com/p/google-diff-match-patch/source/browse/trunk/javascript/diff_match_patch_uncompressed.js),
   * modifications are licensed as more fully set forth in LICENSE.txt.
   *
   * The original source of google-diff-match-patch is attributable and licensed as follows:
   *
   * Copyright 2006 Google Inc.
   * https://code.google.com/p/google-diff-match-patch/
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * More Info:
   *  https://code.google.com/p/google-diff-match-patch/
   *
   * Usage: QUnit.diff(expected, actual)
   *
   */
  QUnit.diff = function () {
        function DiffMatchPatch() {}

        //  DIFF FUNCTIONS

        /**
    * The data structure representing a diff is an array of tuples:
    * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
    * which means: delete 'Hello', add 'Goodbye' and keep ' world.'
    */
        var DIFF_DELETE = -1,
            DIFF_INSERT = 1,
            DIFF_EQUAL = 0;

        /**
    * Find the differences between two texts.  Simplifies the problem by stripping
    * any common prefix or suffix off the texts before diffing.
    * @param {string} text1 Old string to be diffed.
    * @param {string} text2 New string to be diffed.
    * @param {boolean=} optChecklines Optional speedup flag. If present and false,
    *     then don't run a line-level diff first to identify the changed areas.
    *     Defaults to true, which does a faster, slightly less optimal diff.
    * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
    */
        DiffMatchPatch.prototype.DiffMain = function (text1, text2, optChecklines) {
                var deadline, checklines, commonlength, commonprefix, commonsuffix, diffs;

                // The diff must be complete in up to 1 second.
                deadline = new Date().getTime() + 1000;

                // Check for null inputs.
                if (text1 === null || text2 === null) {
                        throw new Error("Null input. (DiffMain)");
                }

                // Check for equality (speedup).
                if (text1 === text2) {
                        if (text1) {
                                return [[DIFF_EQUAL, text1]];
                        }
                        return [];
                }

                if (typeof optChecklines === "undefined") {
                        optChecklines = true;
                }

                checklines = optChecklines;

                // Trim off common prefix (speedup).
                commonlength = this.diffCommonPrefix(text1, text2);
                commonprefix = text1.substring(0, commonlength);
                text1 = text1.substring(commonlength);
                text2 = text2.substring(commonlength);

                // Trim off common suffix (speedup).
                commonlength = this.diffCommonSuffix(text1, text2);
                commonsuffix = text1.substring(text1.length - commonlength);
                text1 = text1.substring(0, text1.length - commonlength);
                text2 = text2.substring(0, text2.length - commonlength);

                // Compute the diff on the middle block.
                diffs = this.diffCompute(text1, text2, checklines, deadline);

                // Restore the prefix and suffix.
                if (commonprefix) {
                        diffs.unshift([DIFF_EQUAL, commonprefix]);
                }
                if (commonsuffix) {
                        diffs.push([DIFF_EQUAL, commonsuffix]);
                }
                this.diffCleanupMerge(diffs);
                return diffs;
        };

        /**
    * Reduce the number of edits by eliminating operationally trivial equalities.
    * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
    */
        DiffMatchPatch.prototype.diffCleanupEfficiency = function (diffs) {
                var changes, equalities, equalitiesLength, lastequality, pointer, preIns, preDel, postIns, postDel;
                changes = false;
                equalities = []; // Stack of indices where equalities are found.
                equalitiesLength = 0; // Keeping our own length var is faster in JS.
                /** @type {?string} */
                lastequality = null;

                // Always equal to diffs[equalities[equalitiesLength - 1]][1]
                pointer = 0; // Index of current position.

                // Is there an insertion operation before the last equality.
                preIns = false;

                // Is there a deletion operation before the last equality.
                preDel = false;

                // Is there an insertion operation after the last equality.
                postIns = false;

                // Is there a deletion operation after the last equality.
                postDel = false;
                while (pointer < diffs.length) {

                        // Equality found.
                        if (diffs[pointer][0] === DIFF_EQUAL) {
                                if (diffs[pointer][1].length < 4 && (postIns || postDel)) {

                                        // Candidate found.
                                        equalities[equalitiesLength++] = pointer;
                                        preIns = postIns;
                                        preDel = postDel;
                                        lastequality = diffs[pointer][1];
                                } else {

                                        // Not a candidate, and can never become one.
                                        equalitiesLength = 0;
                                        lastequality = null;
                                }
                                postIns = postDel = false;

                                // An insertion or deletion.
                        } else {

                                if (diffs[pointer][0] === DIFF_DELETE) {
                                        postDel = true;
                                } else {
                                        postIns = true;
                                }

                                /*
       * Five types to be split:
       * <ins>A</ins><del>B</del>XY<ins>C</ins><del>D</del>
       * <ins>A</ins>X<ins>C</ins><del>D</del>
       * <ins>A</ins><del>B</del>X<ins>C</ins>
       * <ins>A</del>X<ins>C</ins><del>D</del>
       * <ins>A</ins><del>B</del>X<del>C</del>
       */
                                if (lastequality && (preIns && preDel && postIns && postDel || lastequality.length < 2 && preIns + preDel + postIns + postDel === 3)) {

                                        // Duplicate record.
                                        diffs.splice(equalities[equalitiesLength - 1], 0, [DIFF_DELETE, lastequality]);

                                        // Change second copy to insert.
                                        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
                                        equalitiesLength--; // Throw away the equality we just deleted;
                                        lastequality = null;
                                        if (preIns && preDel) {

                                                // No changes made which could affect previous entry, keep going.
                                                postIns = postDel = true;
                                                equalitiesLength = 0;
                                        } else {
                                                equalitiesLength--; // Throw away the previous equality.
                                                pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;
                                                postIns = postDel = false;
                                        }
                                        changes = true;
                                }
                        }
                        pointer++;
                }

                if (changes) {
                        this.diffCleanupMerge(diffs);
                }
        };

        /**
    * Convert a diff array into a pretty HTML report.
    * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
    * @param {integer} string to be beautified.
    * @return {string} HTML representation.
    */
        DiffMatchPatch.prototype.diffPrettyHtml = function (diffs) {
                var op,
                    data,
                    x,
                    html = [];
                for (x = 0; x < diffs.length; x++) {
                        op = diffs[x][0]; // Operation (insert, delete, equal)
                        data = diffs[x][1]; // Text of change.
                        switch (op) {
                                case DIFF_INSERT:
                                        html[x] = "<ins>" + escapeText(data) + "</ins>";
                                        break;
                                case DIFF_DELETE:
                                        html[x] = "<del>" + escapeText(data) + "</del>";
                                        break;
                                case DIFF_EQUAL:
                                        html[x] = "<span>" + escapeText(data) + "</span>";
                                        break;
                        }
                }
                return html.join("");
        };

        /**
    * Determine the common prefix of two strings.
    * @param {string} text1 First string.
    * @param {string} text2 Second string.
    * @return {number} The number of characters common to the start of each
    *     string.
    */
        DiffMatchPatch.prototype.diffCommonPrefix = function (text1, text2) {
                var pointermid, pointermax, pointermin, pointerstart;

                // Quick check for common null cases.
                if (!text1 || !text2 || text1.charAt(0) !== text2.charAt(0)) {
                        return 0;
                }

                // Binary search.
                // Performance analysis: https://neil.fraser.name/news/2007/10/09/
                pointermin = 0;
                pointermax = Math.min(text1.length, text2.length);
                pointermid = pointermax;
                pointerstart = 0;
                while (pointermin < pointermid) {
                        if (text1.substring(pointerstart, pointermid) === text2.substring(pointerstart, pointermid)) {
                                pointermin = pointermid;
                                pointerstart = pointermin;
                        } else {
                                pointermax = pointermid;
                        }
                        pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
                }
                return pointermid;
        };

        /**
    * Determine the common suffix of two strings.
    * @param {string} text1 First string.
    * @param {string} text2 Second string.
    * @return {number} The number of characters common to the end of each string.
    */
        DiffMatchPatch.prototype.diffCommonSuffix = function (text1, text2) {
                var pointermid, pointermax, pointermin, pointerend;

                // Quick check for common null cases.
                if (!text1 || !text2 || text1.charAt(text1.length - 1) !== text2.charAt(text2.length - 1)) {
                        return 0;
                }

                // Binary search.
                // Performance analysis: https://neil.fraser.name/news/2007/10/09/
                pointermin = 0;
                pointermax = Math.min(text1.length, text2.length);
                pointermid = pointermax;
                pointerend = 0;
                while (pointermin < pointermid) {
                        if (text1.substring(text1.length - pointermid, text1.length - pointerend) === text2.substring(text2.length - pointermid, text2.length - pointerend)) {
                                pointermin = pointermid;
                                pointerend = pointermin;
                        } else {
                                pointermax = pointermid;
                        }
                        pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
                }
                return pointermid;
        };

        /**
    * Find the differences between two texts.  Assumes that the texts do not
    * have any common prefix or suffix.
    * @param {string} text1 Old string to be diffed.
    * @param {string} text2 New string to be diffed.
    * @param {boolean} checklines Speedup flag.  If false, then don't run a
    *     line-level diff first to identify the changed areas.
    *     If true, then run a faster, slightly less optimal diff.
    * @param {number} deadline Time when the diff should be complete by.
    * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
    * @private
    */
        DiffMatchPatch.prototype.diffCompute = function (text1, text2, checklines, deadline) {
                var diffs, longtext, shorttext, i, hm, text1A, text2A, text1B, text2B, midCommon, diffsA, diffsB;

                if (!text1) {

                        // Just add some text (speedup).
                        return [[DIFF_INSERT, text2]];
                }

                if (!text2) {

                        // Just delete some text (speedup).
                        return [[DIFF_DELETE, text1]];
                }

                longtext = text1.length > text2.length ? text1 : text2;
                shorttext = text1.length > text2.length ? text2 : text1;
                i = longtext.indexOf(shorttext);
                if (i !== -1) {

                        // Shorter text is inside the longer text (speedup).
                        diffs = [[DIFF_INSERT, longtext.substring(0, i)], [DIFF_EQUAL, shorttext], [DIFF_INSERT, longtext.substring(i + shorttext.length)]];

                        // Swap insertions for deletions if diff is reversed.
                        if (text1.length > text2.length) {
                                diffs[0][0] = diffs[2][0] = DIFF_DELETE;
                        }
                        return diffs;
                }

                if (shorttext.length === 1) {

                        // Single character string.
                        // After the previous speedup, the character can't be an equality.
                        return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
                }

                // Check to see if the problem can be split in two.
                hm = this.diffHalfMatch(text1, text2);
                if (hm) {

                        // A half-match was found, sort out the return data.
                        text1A = hm[0];
                        text1B = hm[1];
                        text2A = hm[2];
                        text2B = hm[3];
                        midCommon = hm[4];

                        // Send both pairs off for separate processing.
                        diffsA = this.DiffMain(text1A, text2A, checklines, deadline);
                        diffsB = this.DiffMain(text1B, text2B, checklines, deadline);

                        // Merge the results.
                        return diffsA.concat([[DIFF_EQUAL, midCommon]], diffsB);
                }

                if (checklines && text1.length > 100 && text2.length > 100) {
                        return this.diffLineMode(text1, text2, deadline);
                }

                return this.diffBisect(text1, text2, deadline);
        };

        /**
    * Do the two texts share a substring which is at least half the length of the
    * longer text?
    * This speedup can produce non-minimal diffs.
    * @param {string} text1 First string.
    * @param {string} text2 Second string.
    * @return {Array.<string>} Five element Array, containing the prefix of
    *     text1, the suffix of text1, the prefix of text2, the suffix of
    *     text2 and the common middle.  Or null if there was no match.
    * @private
    */
        DiffMatchPatch.prototype.diffHalfMatch = function (text1, text2) {
                var longtext, shorttext, dmp, text1A, text2B, text2A, text1B, midCommon, hm1, hm2, hm;

                longtext = text1.length > text2.length ? text1 : text2;
                shorttext = text1.length > text2.length ? text2 : text1;
                if (longtext.length < 4 || shorttext.length * 2 < longtext.length) {
                        return null; // Pointless.
                }
                dmp = this; // 'this' becomes 'window' in a closure.

                /**
     * Does a substring of shorttext exist within longtext such that the substring
     * is at least half the length of longtext?
     * Closure, but does not reference any external variables.
     * @param {string} longtext Longer string.
     * @param {string} shorttext Shorter string.
     * @param {number} i Start index of quarter length substring within longtext.
     * @return {Array.<string>} Five element Array, containing the prefix of
     *     longtext, the suffix of longtext, the prefix of shorttext, the suffix
     *     of shorttext and the common middle.  Or null if there was no match.
     * @private
     */
                function diffHalfMatchI(longtext, shorttext, i) {
                        var seed, j, bestCommon, prefixLength, suffixLength, bestLongtextA, bestLongtextB, bestShorttextA, bestShorttextB;

                        // Start with a 1/4 length substring at position i as a seed.
                        seed = longtext.substring(i, i + Math.floor(longtext.length / 4));
                        j = -1;
                        bestCommon = "";
                        while ((j = shorttext.indexOf(seed, j + 1)) !== -1) {
                                prefixLength = dmp.diffCommonPrefix(longtext.substring(i), shorttext.substring(j));
                                suffixLength = dmp.diffCommonSuffix(longtext.substring(0, i), shorttext.substring(0, j));
                                if (bestCommon.length < suffixLength + prefixLength) {
                                        bestCommon = shorttext.substring(j - suffixLength, j) + shorttext.substring(j, j + prefixLength);
                                        bestLongtextA = longtext.substring(0, i - suffixLength);
                                        bestLongtextB = longtext.substring(i + prefixLength);
                                        bestShorttextA = shorttext.substring(0, j - suffixLength);
                                        bestShorttextB = shorttext.substring(j + prefixLength);
                                }
                        }
                        if (bestCommon.length * 2 >= longtext.length) {
                                return [bestLongtextA, bestLongtextB, bestShorttextA, bestShorttextB, bestCommon];
                        } else {
                                return null;
                        }
                }

                // First check if the second quarter is the seed for a half-match.
                hm1 = diffHalfMatchI(longtext, shorttext, Math.ceil(longtext.length / 4));

                // Check again based on the third quarter.
                hm2 = diffHalfMatchI(longtext, shorttext, Math.ceil(longtext.length / 2));
                if (!hm1 && !hm2) {
                        return null;
                } else if (!hm2) {
                        hm = hm1;
                } else if (!hm1) {
                        hm = hm2;
                } else {

                        // Both matched.  Select the longest.
                        hm = hm1[4].length > hm2[4].length ? hm1 : hm2;
                }

                // A half-match was found, sort out the return data.
                if (text1.length > text2.length) {
                        text1A = hm[0];
                        text1B = hm[1];
                        text2A = hm[2];
                        text2B = hm[3];
                } else {
                        text2A = hm[0];
                        text2B = hm[1];
                        text1A = hm[2];
                        text1B = hm[3];
                }
                midCommon = hm[4];
                return [text1A, text1B, text2A, text2B, midCommon];
        };

        /**
    * Do a quick line-level diff on both strings, then rediff the parts for
    * greater accuracy.
    * This speedup can produce non-minimal diffs.
    * @param {string} text1 Old string to be diffed.
    * @param {string} text2 New string to be diffed.
    * @param {number} deadline Time when the diff should be complete by.
    * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
    * @private
    */
        DiffMatchPatch.prototype.diffLineMode = function (text1, text2, deadline) {
                var a, diffs, linearray, pointer, countInsert, countDelete, textInsert, textDelete, j;

                // Scan the text on a line-by-line basis first.
                a = this.diffLinesToChars(text1, text2);
                text1 = a.chars1;
                text2 = a.chars2;
                linearray = a.lineArray;

                diffs = this.DiffMain(text1, text2, false, deadline);

                // Convert the diff back to original text.
                this.diffCharsToLines(diffs, linearray);

                // Eliminate freak matches (e.g. blank lines)
                this.diffCleanupSemantic(diffs);

                // Rediff any replacement blocks, this time character-by-character.
                // Add a dummy entry at the end.
                diffs.push([DIFF_EQUAL, ""]);
                pointer = 0;
                countDelete = 0;
                countInsert = 0;
                textDelete = "";
                textInsert = "";
                while (pointer < diffs.length) {
                        switch (diffs[pointer][0]) {
                                case DIFF_INSERT:
                                        countInsert++;
                                        textInsert += diffs[pointer][1];
                                        break;
                                case DIFF_DELETE:
                                        countDelete++;
                                        textDelete += diffs[pointer][1];
                                        break;
                                case DIFF_EQUAL:

                                        // Upon reaching an equality, check for prior redundancies.
                                        if (countDelete >= 1 && countInsert >= 1) {

                                                // Delete the offending records and add the merged ones.
                                                diffs.splice(pointer - countDelete - countInsert, countDelete + countInsert);
                                                pointer = pointer - countDelete - countInsert;
                                                a = this.DiffMain(textDelete, textInsert, false, deadline);
                                                for (j = a.length - 1; j >= 0; j--) {
                                                        diffs.splice(pointer, 0, a[j]);
                                                }
                                                pointer = pointer + a.length;
                                        }
                                        countInsert = 0;
                                        countDelete = 0;
                                        textDelete = "";
                                        textInsert = "";
                                        break;
                        }
                        pointer++;
                }
                diffs.pop(); // Remove the dummy entry at the end.

                return diffs;
        };

        /**
    * Find the 'middle snake' of a diff, split the problem in two
    * and return the recursively constructed diff.
    * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.
    * @param {string} text1 Old string to be diffed.
    * @param {string} text2 New string to be diffed.
    * @param {number} deadline Time at which to bail if not yet complete.
    * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
    * @private
    */
        DiffMatchPatch.prototype.diffBisect = function (text1, text2, deadline) {
                var text1Length, text2Length, maxD, vOffset, vLength, v1, v2, x, delta, front, k1start, k1end, k2start, k2end, k2Offset, k1Offset, x1, x2, y1, y2, d, k1, k2;

                // Cache the text lengths to prevent multiple calls.
                text1Length = text1.length;
                text2Length = text2.length;
                maxD = Math.ceil((text1Length + text2Length) / 2);
                vOffset = maxD;
                vLength = 2 * maxD;
                v1 = new Array(vLength);
                v2 = new Array(vLength);

                // Setting all elements to -1 is faster in Chrome & Firefox than mixing
                // integers and undefined.
                for (x = 0; x < vLength; x++) {
                        v1[x] = -1;
                        v2[x] = -1;
                }
                v1[vOffset + 1] = 0;
                v2[vOffset + 1] = 0;
                delta = text1Length - text2Length;

                // If the total number of characters is odd, then the front path will collide
                // with the reverse path.
                front = delta % 2 !== 0;

                // Offsets for start and end of k loop.
                // Prevents mapping of space beyond the grid.
                k1start = 0;
                k1end = 0;
                k2start = 0;
                k2end = 0;
                for (d = 0; d < maxD; d++) {

                        // Bail out if deadline is reached.
                        if (new Date().getTime() > deadline) {
                                break;
                        }

                        // Walk the front path one step.
                        for (k1 = -d + k1start; k1 <= d - k1end; k1 += 2) {
                                k1Offset = vOffset + k1;
                                if (k1 === -d || k1 !== d && v1[k1Offset - 1] < v1[k1Offset + 1]) {
                                        x1 = v1[k1Offset + 1];
                                } else {
                                        x1 = v1[k1Offset - 1] + 1;
                                }
                                y1 = x1 - k1;
                                while (x1 < text1Length && y1 < text2Length && text1.charAt(x1) === text2.charAt(y1)) {
                                        x1++;
                                        y1++;
                                }
                                v1[k1Offset] = x1;
                                if (x1 > text1Length) {

                                        // Ran off the right of the graph.
                                        k1end += 2;
                                } else if (y1 > text2Length) {

                                        // Ran off the bottom of the graph.
                                        k1start += 2;
                                } else if (front) {
                                        k2Offset = vOffset + delta - k1;
                                        if (k2Offset >= 0 && k2Offset < vLength && v2[k2Offset] !== -1) {

                                                // Mirror x2 onto top-left coordinate system.
                                                x2 = text1Length - v2[k2Offset];
                                                if (x1 >= x2) {

                                                        // Overlap detected.
                                                        return this.diffBisectSplit(text1, text2, x1, y1, deadline);
                                                }
                                        }
                                }
                        }

                        // Walk the reverse path one step.
                        for (k2 = -d + k2start; k2 <= d - k2end; k2 += 2) {
                                k2Offset = vOffset + k2;
                                if (k2 === -d || k2 !== d && v2[k2Offset - 1] < v2[k2Offset + 1]) {
                                        x2 = v2[k2Offset + 1];
                                } else {
                                        x2 = v2[k2Offset - 1] + 1;
                                }
                                y2 = x2 - k2;
                                while (x2 < text1Length && y2 < text2Length && text1.charAt(text1Length - x2 - 1) === text2.charAt(text2Length - y2 - 1)) {
                                        x2++;
                                        y2++;
                                }
                                v2[k2Offset] = x2;
                                if (x2 > text1Length) {

                                        // Ran off the left of the graph.
                                        k2end += 2;
                                } else if (y2 > text2Length) {

                                        // Ran off the top of the graph.
                                        k2start += 2;
                                } else if (!front) {
                                        k1Offset = vOffset + delta - k2;
                                        if (k1Offset >= 0 && k1Offset < vLength && v1[k1Offset] !== -1) {
                                                x1 = v1[k1Offset];
                                                y1 = vOffset + x1 - k1Offset;

                                                // Mirror x2 onto top-left coordinate system.
                                                x2 = text1Length - x2;
                                                if (x1 >= x2) {

                                                        // Overlap detected.
                                                        return this.diffBisectSplit(text1, text2, x1, y1, deadline);
                                                }
                                        }
                                }
                        }
                }

                // Diff took too long and hit the deadline or
                // number of diffs equals number of characters, no commonality at all.
                return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
        };

        /**
    * Given the location of the 'middle snake', split the diff in two parts
    * and recurse.
    * @param {string} text1 Old string to be diffed.
    * @param {string} text2 New string to be diffed.
    * @param {number} x Index of split point in text1.
    * @param {number} y Index of split point in text2.
    * @param {number} deadline Time at which to bail if not yet complete.
    * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
    * @private
    */
        DiffMatchPatch.prototype.diffBisectSplit = function (text1, text2, x, y, deadline) {
                var text1a, text1b, text2a, text2b, diffs, diffsb;
                text1a = text1.substring(0, x);
                text2a = text2.substring(0, y);
                text1b = text1.substring(x);
                text2b = text2.substring(y);

                // Compute both diffs serially.
                diffs = this.DiffMain(text1a, text2a, false, deadline);
                diffsb = this.DiffMain(text1b, text2b, false, deadline);

                return diffs.concat(diffsb);
        };

        /**
    * Reduce the number of edits by eliminating semantically trivial equalities.
    * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
    */
        DiffMatchPatch.prototype.diffCleanupSemantic = function (diffs) {
                var changes, equalities, equalitiesLength, lastequality, pointer, lengthInsertions2, lengthDeletions2, lengthInsertions1, lengthDeletions1, deletion, insertion, overlapLength1, overlapLength2;
                changes = false;
                equalities = []; // Stack of indices where equalities are found.
                equalitiesLength = 0; // Keeping our own length var is faster in JS.
                /** @type {?string} */
                lastequality = null;

                // Always equal to diffs[equalities[equalitiesLength - 1]][1]
                pointer = 0; // Index of current position.

                // Number of characters that changed prior to the equality.
                lengthInsertions1 = 0;
                lengthDeletions1 = 0;

                // Number of characters that changed after the equality.
                lengthInsertions2 = 0;
                lengthDeletions2 = 0;
                while (pointer < diffs.length) {
                        if (diffs[pointer][0] === DIFF_EQUAL) {
                                // Equality found.
                                equalities[equalitiesLength++] = pointer;
                                lengthInsertions1 = lengthInsertions2;
                                lengthDeletions1 = lengthDeletions2;
                                lengthInsertions2 = 0;
                                lengthDeletions2 = 0;
                                lastequality = diffs[pointer][1];
                        } else {
                                // An insertion or deletion.
                                if (diffs[pointer][0] === DIFF_INSERT) {
                                        lengthInsertions2 += diffs[pointer][1].length;
                                } else {
                                        lengthDeletions2 += diffs[pointer][1].length;
                                }

                                // Eliminate an equality that is smaller or equal to the edits on both
                                // sides of it.
                                if (lastequality && lastequality.length <= Math.max(lengthInsertions1, lengthDeletions1) && lastequality.length <= Math.max(lengthInsertions2, lengthDeletions2)) {

                                        // Duplicate record.
                                        diffs.splice(equalities[equalitiesLength - 1], 0, [DIFF_DELETE, lastequality]);

                                        // Change second copy to insert.
                                        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;

                                        // Throw away the equality we just deleted.
                                        equalitiesLength--;

                                        // Throw away the previous equality (it needs to be reevaluated).
                                        equalitiesLength--;
                                        pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;

                                        // Reset the counters.
                                        lengthInsertions1 = 0;
                                        lengthDeletions1 = 0;
                                        lengthInsertions2 = 0;
                                        lengthDeletions2 = 0;
                                        lastequality = null;
                                        changes = true;
                                }
                        }
                        pointer++;
                }

                // Normalize the diff.
                if (changes) {
                        this.diffCleanupMerge(diffs);
                }

                // Find any overlaps between deletions and insertions.
                // e.g: <del>abcxxx</del><ins>xxxdef</ins>
                //   -> <del>abc</del>xxx<ins>def</ins>
                // e.g: <del>xxxabc</del><ins>defxxx</ins>
                //   -> <ins>def</ins>xxx<del>abc</del>
                // Only extract an overlap if it is as big as the edit ahead or behind it.
                pointer = 1;
                while (pointer < diffs.length) {
                        if (diffs[pointer - 1][0] === DIFF_DELETE && diffs[pointer][0] === DIFF_INSERT) {
                                deletion = diffs[pointer - 1][1];
                                insertion = diffs[pointer][1];
                                overlapLength1 = this.diffCommonOverlap(deletion, insertion);
                                overlapLength2 = this.diffCommonOverlap(insertion, deletion);
                                if (overlapLength1 >= overlapLength2) {
                                        if (overlapLength1 >= deletion.length / 2 || overlapLength1 >= insertion.length / 2) {

                                                // Overlap found.  Insert an equality and trim the surrounding edits.
                                                diffs.splice(pointer, 0, [DIFF_EQUAL, insertion.substring(0, overlapLength1)]);
                                                diffs[pointer - 1][1] = deletion.substring(0, deletion.length - overlapLength1);
                                                diffs[pointer + 1][1] = insertion.substring(overlapLength1);
                                                pointer++;
                                        }
                                } else {
                                        if (overlapLength2 >= deletion.length / 2 || overlapLength2 >= insertion.length / 2) {

                                                // Reverse overlap found.
                                                // Insert an equality and swap and trim the surrounding edits.
                                                diffs.splice(pointer, 0, [DIFF_EQUAL, deletion.substring(0, overlapLength2)]);

                                                diffs[pointer - 1][0] = DIFF_INSERT;
                                                diffs[pointer - 1][1] = insertion.substring(0, insertion.length - overlapLength2);
                                                diffs[pointer + 1][0] = DIFF_DELETE;
                                                diffs[pointer + 1][1] = deletion.substring(overlapLength2);
                                                pointer++;
                                        }
                                }
                                pointer++;
                        }
                        pointer++;
                }
        };

        /**
    * Determine if the suffix of one string is the prefix of another.
    * @param {string} text1 First string.
    * @param {string} text2 Second string.
    * @return {number} The number of characters common to the end of the first
    *     string and the start of the second string.
    * @private
    */
        DiffMatchPatch.prototype.diffCommonOverlap = function (text1, text2) {
                var text1Length, text2Length, textLength, best, length, pattern, found;

                // Cache the text lengths to prevent multiple calls.
                text1Length = text1.length;
                text2Length = text2.length;

                // Eliminate the null case.
                if (text1Length === 0 || text2Length === 0) {
                        return 0;
                }

                // Truncate the longer string.
                if (text1Length > text2Length) {
                        text1 = text1.substring(text1Length - text2Length);
                } else if (text1Length < text2Length) {
                        text2 = text2.substring(0, text1Length);
                }
                textLength = Math.min(text1Length, text2Length);

                // Quick check for the worst case.
                if (text1 === text2) {
                        return textLength;
                }

                // Start by looking for a single character match
                // and increase length until no match is found.
                // Performance analysis: https://neil.fraser.name/news/2010/11/04/
                best = 0;
                length = 1;
                while (true) {
                        pattern = text1.substring(textLength - length);
                        found = text2.indexOf(pattern);
                        if (found === -1) {
                                return best;
                        }
                        length += found;
                        if (found === 0 || text1.substring(textLength - length) === text2.substring(0, length)) {
                                best = length;
                                length++;
                        }
                }
        };

        /**
    * Split two texts into an array of strings.  Reduce the texts to a string of
    * hashes where each Unicode character represents one line.
    * @param {string} text1 First string.
    * @param {string} text2 Second string.
    * @return {{chars1: string, chars2: string, lineArray: !Array.<string>}}
    *     An object containing the encoded text1, the encoded text2 and
    *     the array of unique strings.
    *     The zeroth element of the array of unique strings is intentionally blank.
    * @private
    */
        DiffMatchPatch.prototype.diffLinesToChars = function (text1, text2) {
                var lineArray, lineHash, chars1, chars2;
                lineArray = []; // E.g. lineArray[4] === 'Hello\n'
                lineHash = {}; // E.g. lineHash['Hello\n'] === 4

                // '\x00' is a valid character, but various debuggers don't like it.
                // So we'll insert a junk entry to avoid generating a null character.
                lineArray[0] = "";

                /**
     * Split a text into an array of strings.  Reduce the texts to a string of
     * hashes where each Unicode character represents one line.
     * Modifies linearray and linehash through being a closure.
     * @param {string} text String to encode.
     * @return {string} Encoded string.
     * @private
     */
                function diffLinesToCharsMunge(text) {
                        var chars, lineStart, lineEnd, lineArrayLength, line;
                        chars = "";

                        // Walk the text, pulling out a substring for each line.
                        // text.split('\n') would would temporarily double our memory footprint.
                        // Modifying text would create many large strings to garbage collect.
                        lineStart = 0;
                        lineEnd = -1;

                        // Keeping our own length variable is faster than looking it up.
                        lineArrayLength = lineArray.length;
                        while (lineEnd < text.length - 1) {
                                lineEnd = text.indexOf("\n", lineStart);
                                if (lineEnd === -1) {
                                        lineEnd = text.length - 1;
                                }
                                line = text.substring(lineStart, lineEnd + 1);
                                lineStart = lineEnd + 1;

                                var lineHashExists = lineHash.hasOwnProperty ? lineHash.hasOwnProperty(line) : lineHash[line] !== undefined;

                                if (lineHashExists) {
                                        chars += String.fromCharCode(lineHash[line]);
                                } else {
                                        chars += String.fromCharCode(lineArrayLength);
                                        lineHash[line] = lineArrayLength;
                                        lineArray[lineArrayLength++] = line;
                                }
                        }
                        return chars;
                }

                chars1 = diffLinesToCharsMunge(text1);
                chars2 = diffLinesToCharsMunge(text2);
                return {
                        chars1: chars1,
                        chars2: chars2,
                        lineArray: lineArray
                };
        };

        /**
    * Rehydrate the text in a diff from a string of line hashes to real lines of
    * text.
    * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
    * @param {!Array.<string>} lineArray Array of unique strings.
    * @private
    */
        DiffMatchPatch.prototype.diffCharsToLines = function (diffs, lineArray) {
                var x, chars, text, y;
                for (x = 0; x < diffs.length; x++) {
                        chars = diffs[x][1];
                        text = [];
                        for (y = 0; y < chars.length; y++) {
                                text[y] = lineArray[chars.charCodeAt(y)];
                        }
                        diffs[x][1] = text.join("");
                }
        };

        /**
    * Reorder and merge like edit sections.  Merge equalities.
    * Any edit section can move as long as it doesn't cross an equality.
    * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
    */
        DiffMatchPatch.prototype.diffCleanupMerge = function (diffs) {
                var pointer, countDelete, countInsert, textInsert, textDelete, commonlength, changes, diffPointer, position;
                diffs.push([DIFF_EQUAL, ""]); // Add a dummy entry at the end.
                pointer = 0;
                countDelete = 0;
                countInsert = 0;
                textDelete = "";
                textInsert = "";

                while (pointer < diffs.length) {
                        switch (diffs[pointer][0]) {
                                case DIFF_INSERT:
                                        countInsert++;
                                        textInsert += diffs[pointer][1];
                                        pointer++;
                                        break;
                                case DIFF_DELETE:
                                        countDelete++;
                                        textDelete += diffs[pointer][1];
                                        pointer++;
                                        break;
                                case DIFF_EQUAL:

                                        // Upon reaching an equality, check for prior redundancies.
                                        if (countDelete + countInsert > 1) {
                                                if (countDelete !== 0 && countInsert !== 0) {

                                                        // Factor out any common prefixes.
                                                        commonlength = this.diffCommonPrefix(textInsert, textDelete);
                                                        if (commonlength !== 0) {
                                                                if (pointer - countDelete - countInsert > 0 && diffs[pointer - countDelete - countInsert - 1][0] === DIFF_EQUAL) {
                                                                        diffs[pointer - countDelete - countInsert - 1][1] += textInsert.substring(0, commonlength);
                                                                } else {
                                                                        diffs.splice(0, 0, [DIFF_EQUAL, textInsert.substring(0, commonlength)]);
                                                                        pointer++;
                                                                }
                                                                textInsert = textInsert.substring(commonlength);
                                                                textDelete = textDelete.substring(commonlength);
                                                        }

                                                        // Factor out any common suffixies.
                                                        commonlength = this.diffCommonSuffix(textInsert, textDelete);
                                                        if (commonlength !== 0) {
                                                                diffs[pointer][1] = textInsert.substring(textInsert.length - commonlength) + diffs[pointer][1];
                                                                textInsert = textInsert.substring(0, textInsert.length - commonlength);
                                                                textDelete = textDelete.substring(0, textDelete.length - commonlength);
                                                        }
                                                }

                                                // Delete the offending records and add the merged ones.
                                                if (countDelete === 0) {
                                                        diffs.splice(pointer - countInsert, countDelete + countInsert, [DIFF_INSERT, textInsert]);
                                                } else if (countInsert === 0) {
                                                        diffs.splice(pointer - countDelete, countDelete + countInsert, [DIFF_DELETE, textDelete]);
                                                } else {
                                                        diffs.splice(pointer - countDelete - countInsert, countDelete + countInsert, [DIFF_DELETE, textDelete], [DIFF_INSERT, textInsert]);
                                                }
                                                pointer = pointer - countDelete - countInsert + (countDelete ? 1 : 0) + (countInsert ? 1 : 0) + 1;
                                        } else if (pointer !== 0 && diffs[pointer - 1][0] === DIFF_EQUAL) {

                                                // Merge this equality with the previous one.
                                                diffs[pointer - 1][1] += diffs[pointer][1];
                                                diffs.splice(pointer, 1);
                                        } else {
                                                pointer++;
                                        }
                                        countInsert = 0;
                                        countDelete = 0;
                                        textDelete = "";
                                        textInsert = "";
                                        break;
                        }
                }
                if (diffs[diffs.length - 1][1] === "") {
                        diffs.pop(); // Remove the dummy entry at the end.
                }

                // Second pass: look for single edits surrounded on both sides by equalities
                // which can be shifted sideways to eliminate an equality.
                // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
                changes = false;
                pointer = 1;

                // Intentionally ignore the first and last element (don't need checking).
                while (pointer < diffs.length - 1) {
                        if (diffs[pointer - 1][0] === DIFF_EQUAL && diffs[pointer + 1][0] === DIFF_EQUAL) {

                                diffPointer = diffs[pointer][1];
                                position = diffPointer.substring(diffPointer.length - diffs[pointer - 1][1].length);

                                // This is a single edit surrounded by equalities.
                                if (position === diffs[pointer - 1][1]) {

                                        // Shift the edit over the previous equality.
                                        diffs[pointer][1] = diffs[pointer - 1][1] + diffs[pointer][1].substring(0, diffs[pointer][1].length - diffs[pointer - 1][1].length);
                                        diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];
                                        diffs.splice(pointer - 1, 1);
                                        changes = true;
                                } else if (diffPointer.substring(0, diffs[pointer + 1][1].length) === diffs[pointer + 1][1]) {

                                        // Shift the edit over the next equality.
                                        diffs[pointer - 1][1] += diffs[pointer + 1][1];
                                        diffs[pointer][1] = diffs[pointer][1].substring(diffs[pointer + 1][1].length) + diffs[pointer + 1][1];
                                        diffs.splice(pointer + 1, 1);
                                        changes = true;
                                }
                        }
                        pointer++;
                }

                // If shifts were made, the diff needs reordering and another shift sweep.
                if (changes) {
                        this.diffCleanupMerge(diffs);
                }
        };

        return function (o, n) {
                var diff, output, text;
                diff = new DiffMatchPatch();
                output = diff.DiffMain(o, n);
                diff.diffCleanupEfficiency(output);
                text = diff.diffPrettyHtml(output);

                return text;
        };
  }();

}((function() { return this; }())));