Function test to test keepNewLines

In preperation of rewriting convertHtmlToListOfWords I added a test
to check if the keepNewLines feature still works as expected afterwards.

Author: SavageTiger

tests/Caxy/Tests/HtmlDiff/Functional/HtmlDiffFunctionalTest.php

@@ -29,7 +29,7 @@ public function testHtmlDiff(string $oldText, string $newText, string $expected,
             $expected = $this->stripExtraWhitespaceAndNewLines($expected);
         }
 
-        static::assertEquals($expected, $output);
+        static::assertEquals(trim($expected), trim($output));
     }
 
     public function diffContentProvider()

tests/fixtures/HtmlDiff/keep-newlines-test.html

@@ -0,0 +1,40 @@
+<options>
+    <option type="boolean" name="setKeepNewLines" value="true" />
+    <option type="boolean" name="setPurifierEnabled" value="false" />
+</options>
+
+<oldText>
+    Please read the non-informative information underneath <br />
+
+    <pre>
+        This is the first paragraph.
+
+
+
+        This is the second paragraph
+    </pre>
+</oldText>
+
+<newText>
+    Please read the non-informative information underneath <br />
+
+    <pre>
+        This is the primary paragraph.
+
+
+
+        This is the secondary paragraph
+    </pre>
+</newText>
+
+<expected>
+    Please read the non-informative information underneath <br />
+
+    <pre>
+        This is the <del class="diffmod">first</del><ins class="diffmod">primary</ins> paragraph.
+
+
+
+        This is the <del class="diffmod">second</del><ins class="diffmod">secondary</ins> paragraph
+    </pre>
+</expected>