Add more tests

Author: JBlond

tests/Diff/Renderer/Html/MergedTest.php

@@ -21,4 +21,58 @@ public function testMergedRendererReplaceCase()
         $this->assertStringContainsString('<del', $output);
         $this->assertStringContainsString('<ins', $output);
     }
+
+    public function testInsertCase()
+    {
+        $a = "line1\nline2";
+        $b = "line1\nline2\nline3";
+
+        $diff = new Diff($a, $b);
+        $output = $diff->render(new Merged());
+
+        $this->assertStringContainsString('<ins', $output);
+        $this->assertStringContainsString('line3', $output);
+    }
+
+    public function testDeleteCase()
+    {
+        $a = "line1\nline2\nline3";
+        $b = "line1\nline3";
+
+        $diff = new Diff($a, $b);
+        $output = $diff->render(new Merged());
+
+        $this->assertStringContainsString('ChangeDelete', $output);
+        $this->assertStringContainsString('line2', $output);
+    }
+
+    public function testMixedChanges()
+    {
+        $a = "alpha\nbeta\ngamma\ndelta";
+        $b = "alpha\nBETA\ngamma\nnew-delta";
+
+        $diff = new Diff($a, $b);
+        $output = $diff->render(new Merged());
+
+        $this->assertStringContainsString('<del>beta</del>', $output);
+        $this->assertStringContainsString('<ins>BETA</ins>', $output);
+        $this->assertStringContainsString('<ins>new-</ins>', $output);
+        $this->assertStringContainsString('delta', $output);
+    }
+
+
+    public function testReplaceCaseTriggersMergedBlock()
+    {
+        $a = "line1\nsame\nline3";
+        $b = "line1\nchanged\nline3";
+
+        $diff = new Diff($a, $b);
+        $output = $diff->render(new Merged());
+
+        // Hier sollte der Block ab Zeile 250 greifen:
+        $this->assertStringContainsString('<del', $output);
+        $this->assertStringContainsString('<ins', $output);
+        $this->assertStringContainsString('same', $output);
+        $this->assertStringContainsString('changed', $output);
+    }
 }