resources/src/jquery/jquery.qunit.completenessTest.js

   1 /**
   2  * jQuery QUnit CompletenessTest 0.4
   3  *
   4  * Tests the completeness of test suites for object oriented javascript
   5  * libraries. Written to be used in environments with jQuery and QUnit.
   6  * Requires jQuery 1.7.2 or higher.
   7  *
   8  * Built for and tested with:
   9  * - Chrome 19
  10  * - Firefox 4
  11  * - Safari 5
  12  *
  13  * @author Timo Tijhof, 2011-2012
  14  */
  15 ( function ( mw, $ ) {
  16         'use strict';
  17
  18         var util,
  19                 hasOwn = Object.prototype.hasOwnProperty,
  20                 log = ( window.console && window.console.log )
  21                         ? function () { return window.console.log.apply( window.console, arguments ); }
  22                         : function () {};
  23
  24         // Simplified version of a few jQuery methods, except that they don't
  25         // call other jQuery methods. Required to be able to run the CompletenessTest
  26         // on jQuery itself as well.
  27         util = {
  28                 keys: Object.keys || function ( object ) {
  29                         var key, keys = [];
  30                         for ( key in object ) {
  31                                 if ( hasOwn.call( object, key ) ) {
  32                                         keys.push( key );
  33                                 }
  34                         }
  35                         return keys;
  36                 },
  37                 each: function ( object, callback ) {
  38                         var name;
  39                         for ( name in object ) {
  40                                 if ( callback.call( object[ name ], name, object[ name ] ) === false ) {
  41                                         break;
  42                                 }
  43                         }
  44                 },
  45                 // $.type and $.isEmptyObject are safe as is, they don't call
  46                 // other $.* methods. Still need to be derefenced into `util`
  47                 // since the CompletenessTest will overload them with spies.
  48                 type: $.type,
  49                 isEmptyObject: $.isEmptyObject
  50         };
  51
  52         /**
  53          * CompletenessTest
  54          *
  55          * @constructor
  56          * @example
  57          *  var myTester = new CompletenessTest( myLib );
  58          * @param {Object} masterVariable The root variable that contains all object
  59          *  members. CompletenessTest will recursively traverse objects and keep track
  60          *  of all methods.
  61          * @param {Function} [ignoreFn] Optionally pass a function to filter out certain
  62          *  methods. Example: You may want to filter out instances of jQuery or some
  63          *  other constructor. Otherwise "missingTests" will include all methods that
  64          *  were not called from that instance.
  65          */
  66         function CompletenessTest( masterVariable, ignoreFn ) {
  67                 var warn,
  68                         that = this;
  69
  70                 // Keep track in these objects. Keyed by strings with the
  71                 // method names (ie. 'my.foo', 'my.bar', etc.) values are boolean true.
  72                 this.injectionTracker = {};
  73                 this.methodCallTracker = {};
  74                 this.missingTests = {};
  75
  76                 this.ignoreFn = ignoreFn === undefined ? function () { return false; } : ignoreFn;
  77
  78                 // Lazy limit in case something weird happends (like recurse (part of) ourself).
  79                 this.lazyLimit = 2000;
  80                 this.lazyCounter = 0;
  81
  82                 // Bind begin and end to QUnit.
  83                 QUnit.begin( function () {
  84                         // Suppress warnings (e.g. deprecation notices for accessing the properties)
  85                         warn = mw.log.warn;
  86                         mw.log.warn = $.noop;
  87
  88                         that.walkTheObject( masterVariable, null, masterVariable, [] );
  89                         log( 'CompletenessTest/walkTheObject', that );
  90
  91                         // Restore warnings
  92                         mw.log.warn = warn;
  93                         warn = undefined;
  94                 } );
  95
  96                 QUnit.done( function () {
  97                         that.populateMissingTests();
  98                         log( 'CompletenessTest/populateMissingTests', that );
  99
 100                         var toolbar, testResults, cntTotal, cntCalled, cntMissing;
 101
 102                         cntTotal = util.keys( that.injectionTracker ).length;
 103                         cntCalled = util.keys( that.methodCallTracker ).length;
 104                         cntMissing = util.keys( that.missingTests ).length;
 105
 106                         function makeTestResults( blob, title, style ) {
 107                                 var elOutputWrapper, elTitle, elContainer, elList, elFoot;
 108
 109                                 elTitle = document.createElement( 'strong' );
 110                                 elTitle.textContent = title || 'Values';
 111
 112                                 elList = document.createElement( 'ul' );
 113                                 util.each( blob, function ( key ) {
 114                                         var elItem = document.createElement( 'li' );
 115                                         elItem.textContent = key;
 116                                         elList.appendChild( elItem );
 117                                 } );
 118
 119                                 elFoot = document.createElement( 'p' );
 120                                 elFoot.innerHTML = '<em>&mdash; CompletenessTest</em>';
 121
 122                                 elContainer = document.createElement( 'div' );
 123                                 elContainer.appendChild( elTitle );
 124                                 elContainer.appendChild( elList );
 125                                 elContainer.appendChild( elFoot );
 126
 127                                 elOutputWrapper = document.getElementById( 'qunit-completenesstest' );
 128                                 if ( !elOutputWrapper ) {
 129                                         elOutputWrapper = document.createElement( 'div' );
 130                                         elOutputWrapper.id = 'qunit-completenesstest';
 131                                 }
 132                                 elOutputWrapper.appendChild( elContainer );
 133
 134                                 util.each( style, function ( key, value ) {
 135                                         elOutputWrapper.style[ key ] = value;
 136                                 } );
 137                                 return elOutputWrapper;
 138                         }
 139
 140                         if ( cntMissing === 0 ) {
 141                                 // Good
 142                                 testResults = makeTestResults(
 143                                         {},
 144                                         'Detected calls to ' + cntCalled + '/' + cntTotal + ' methods. No missing tests!',
 145                                         {
 146                                                 backgroundColor: '#D2E0E6',
 147                                                 color: '#366097',
 148                                                 paddingTop: '1em',
 149                                                 paddingRight: '1em',
 150                                                 paddingBottom: '1em',
 151                                                 paddingLeft: '1em'
 152                                         }
 153                                 );
 154                         } else {
 155                                 // Bad
 156                                 testResults = makeTestResults(
 157                                         that.missingTests,
 158                                         'Detected calls to ' + cntCalled + '/' + cntTotal + ' methods. ' + cntMissing + ' methods not covered:',
 159                                         {
 160                                                 backgroundColor: '#EE5757',
 161                                                 color: 'black',
 162                                                 paddingTop: '1em',
 163                                                 paddingRight: '1em',
 164                                                 paddingBottom: '1em',
 165                                                 paddingLeft: '1em'
 166                                         }
 167                                 );
 168                         }
 169
 170                         toolbar = document.getElementById( 'qunit-testrunner-toolbar' );
 171                         if ( toolbar ) {
 172                                 toolbar.insertBefore( testResults, toolbar.firstChild );
 173                         }
 174                 } );
 175
 176                 return this;
 177         }
 178
 179         /* Public methods */
 180         CompletenessTest.fn = CompletenessTest.prototype = {
 181
 182                 /**
 183                  * CompletenessTest.fn.walkTheObject
 184                  *
 185                  * This function recursively walks through the given object, calling itself as it goes.
 186                  * Depending on the action it either injects our listener into the methods, or
 187                  * reads from our tracker and records which methods have not been called by the test suite.
 188                  *
 189                  * @param {String|Null} currName Name of the given object member (Initially this is null).
 190                  * @param {mixed} currVar The variable to check (initially an object,
 191                  *  further down it could be anything).
 192                  * @param {Object} masterVariable Throughout our interation, always keep track of the master/root.
 193                  *  Initially this is the same as currVar.
 194                  * @param {Array} parentPathArray Array of names that indicate our breadcrumb path starting at
 195                  *  masterVariable. Not including currName.
 196                  */
 197                 walkTheObject: function ( currObj, currName, masterVariable, parentPathArray ) {
 198                         var key, currVal, type,
 199                                 ct = this,
 200                                 currPathArray = parentPathArray;
 201
 202                         if ( currName ) {
 203                                 currPathArray.push( currName );
 204                                 currVal = currObj[ currName ];
 205                         } else {
 206                                 currName = '(root)';
 207                                 currVal = currObj;
 208                         }
 209
 210                         type = util.type( currVal );
 211
 212                         // Hard ignores
 213                         if ( this.ignoreFn( currVal, this, currPathArray ) ) {
 214                                 return null;
 215                         }
 216
 217                         // Handle the lazy limit
 218                         this.lazyCounter++;
 219                         if ( this.lazyCounter > this.lazyLimit ) {
 220                                 log( 'CompletenessTest.fn.walkTheObject> Limit reached: ' + this.lazyCounter, currPathArray );
 221                                 return null;
 222                         }
 223
 224                         // Functions
 225                         if ( type === 'function' ) {
 226                                 // Don't put a spy in constructor functions as it messes with
 227                                 // instanceof etc.
 228                                 if ( !currVal.prototype || util.isEmptyObject( currVal.prototype ) ) {
 229                                         this.injectionTracker[ currPathArray.join( '.' ) ] = true;
 230                                         this.injectCheck( currObj, currName, function () {
 231                                                 ct.methodCallTracker[ currPathArray.join( '.' ) ] = true;
 232                                         } );
 233                                 }
 234                         }
 235
 236                         // Recursively. After all, this is the *completeness* test
 237                         // This also traverses static properties and the prototype of a constructor
 238                         if ( type === 'object' || type === 'function' ) {
 239                                 for ( key in currVal ) {
 240                                         if ( hasOwn.call( currVal, key ) ) {
 241                                                 this.walkTheObject( currVal, key, masterVariable, currPathArray.slice() );
 242                                         }
 243                                 }
 244                         }
 245                 },
 246
 247                 populateMissingTests: function () {
 248                         var ct = this;
 249                         util.each( ct.injectionTracker, function ( key ) {
 250                                 ct.hasTest( key );
 251                         } );
 252                 },
 253
 254                 /**
 255                  * CompletenessTest.fn.hasTest
 256                  *
 257                  * Checks if the given method name (ie. 'my.foo.bar')
 258                  * was called during the test suite (as far as the tracker knows).
 259                  * If not it adds it to missingTests.
 260                  *
 261                  * @param {String} fnName
 262                  * @return {Boolean}
 263                  */
 264                 hasTest: function ( fnName ) {
 265                         if ( !( fnName in this.methodCallTracker ) ) {
 266                                 this.missingTests[ fnName ] = true;
 267                                 return false;
 268                         }
 269                         return true;
 270                 },
 271
 272                 /**
 273                  * CompletenessTest.fn.injectCheck
 274                  *
 275                  * Injects a function (such as a spy that updates methodCallTracker when
 276                  * it's called) inside another function.
 277                  *
 278                  * @param {Object} masterVariable
 279                  * @param {Array} objectPathArray
 280                  * @param {Function} injectFn
 281                  */
 282                 injectCheck: function ( obj, key, injectFn ) {
 283                         var spy,
 284                                 val = obj[ key ];
 285
 286                         spy = function () {
 287                                 injectFn();
 288                                 return val.apply( this, arguments );
 289                         };
 290
 291                         // Make the spy inherit from the original so that its static methods are also
 292                         // visible in the spy (e.g. when we inject a check into mw.log, mw.log.warn
 293                         // must remain accessible).
 294                         // XXX: https://github.com/jshint/jshint/issues/2656
 295                         /*jshint ignore:start */
 296                         /*jshint proto:true */
 297                         spy.__proto__ = val;
 298                         /*jshint ignore:end */
 299
 300                         // Objects are by reference, members (unless objects) are not.
 301                         obj[ key ] = spy;
 302                 }
 303         };
 304
 305         /* Expose */
 306         window.CompletenessTest = CompletenessTest;
 307
 308 }( mediaWiki, jQuery ) );