Add tests for DifferenceEngine for revision loading

Change-Id: Ia206b396e96b52ba9ac4895aae0f2839dca6f958

diff --git a/tests/phpunit/includes/diff/DifferenceEngineTest.php b/tests/phpunit/includes/diff/DifferenceEngineTest.php
new file mode 100644 (file)
index 0000000..a10c024
--- /dev/null
+++ b/tests/phpunit/includes/diff/DifferenceEngineTest.php
@@ -0,0 +1,120 @@
+<?php
+
+/**
+ * @covers DifferenceEngine
+ *
+ * @todo tests for the rest of DifferenceEngine!
+ *
+ * @group Database
+ *
+ * @licence GNU GPL v2+
+ * @author Katie Filbert < aude.wiki@gmail.com >
+ */
+class DifferenceEngineTest extends MediaWikiTestCase {
+
+       protected $context;
+
+       private static $revisions;
+
+       public function setUp() {
+               parent::setUp();
+
+               $title = $this->getTitle();
+
+               $this->context = new RequestContext();
+               $this->context->setTitle( $title );
+
+               if ( !self::$revisions ) {
+                       self::$revisions = $this->doEdits();
+               }
+       }
+
+       /**
+        * @return Title
+        */
+       protected function getTitle() {
+               $namespace = $this->getDefaultWikitextNS();
+               return Title::newFromText( 'Kitten', $namespace );
+       }
+
+       /**
+        * @return int[] revision ids
+        */
+       protected function doEdits() {
+               $title = $this->getTitle();
+               $page = WikiPage::factory( $title );
+
+               $strings = array( "it is a kitten", "two kittens", "three kittens", "four kittens" );
+               $revisions = array();
+
+               foreach( $strings as $string ) {
+                       $content = ContentHandler::makeContent( $string, $title );
+                       $page->doEditContent( $content, 'edit page' );
+                       $revisions[] = $page->getLatest();
+               }
+
+               return $revisions;
+       }
+
+       public function testMapDiffPrevNext() {
+               $cases = $this->getMapDiffPrevNextCases();
+
+               foreach( $cases as $case ) {
+                       list( $expected, $old, $new, $message ) = $case;
+
+                       $diffEngine = new DifferenceEngine( $this->context, $old, $new, 2, true, false );
+                       $diffMap = $diffEngine->mapDiffPrevNext( $old, $new );
+                       $this->assertEquals( $expected, $diffMap, $message );
+               }
+       }
+
+       private function getMapDiffPrevNextCases() {
+               $revs = self::$revisions;
+
+               return array(
+                       array( array( $revs[1], $revs[2] ), $revs[2], 'prev', 'diff=prev' ),
+                       array( array( $revs[2], $revs[3] ), $revs[2], 'next', 'diff=next' ),
+                       array( array( $revs[1], $revs[3] ), $revs[1], $revs[3], 'diff=' . $revs[3] )
+               );
+       }
+
+       public function testLoadRevisionData() {
+               $cases = $this->getLoadRevisionDataCases();
+
+               foreach( $cases as $case ) {
+                       list( $expectedOld, $expectedNew, $old, $new, $message ) = $case;
+
+                       $diffEngine = new DifferenceEngine( $this->context, $old, $new, 2, true, false );
+                       $diffEngine->loadRevisionData();
+
+                       $this->assertEquals( $diffEngine->mOldid, $expectedOld, $message );
+                       $this->assertEquals( $diffEngine->mNewid, $expectedNew, $message );
+               }
+       }
+
+       private function getLoadRevisionDataCases() {
+               $revs = self::$revisions;
+
+               return array(
+                       array( $revs[2], $revs[3], $revs[3], 'prev', 'diff=prev' ),
+                       array( $revs[2], $revs[3], $revs[2], 'next', 'diff=next' ),
+                       array( $revs[1], $revs[3], $revs[1], $revs[3], 'diff=' . $revs[3] ),
+                       array( $revs[1], $revs[3], $revs[1], 0, 'diff=0' )
+               );
+       }
+
+       public function testGetOldid() {
+               $revs = self::$revisions;
+
+               $diffEngine = new DifferenceEngine( $this->context, $revs[1], $revs[2], 2, true, false );
+               $this->assertEquals( $revs[1], $diffEngine->getOldid(), 'diff get old id' );
+       }
+
+       public function testGetNewid() {
+               $revs = self::$revisions;
+
+               $diffEngine = new DifferenceEngine( $this->context, $revs[1], $revs[2], 2, true, false );
+               $this->assertEquals( $revs[2], $diffEngine->getNewid(), 'diff get new id' );
+       }
+
+}