Add test to prevent regression

Author: aidantwoods

test/data/fenced_code_block.html

@@ -8,4 +8,6 @@
 <pre><code class="language-html+php">&lt;?php
 echo "Hello World";
 ?&gt;
-&lt;a href="http://auraphp.com" &gt;Aura Project&lt;/a&gt;</code></pre>
+&lt;a href="http://auraphp.com" &gt;Aura Project&lt;/a&gt;</code></pre>
+<pre><code class="language-php">&lt;?php
+echo "Hello World";</code></pre>

test/data/fenced_code_block.md

@@ -22,4 +22,9 @@ echo 'language identifier with non words';
 echo "Hello World";
 ?>
 <a href="http://auraphp.com" >Aura Project</a>
+```
+
+```php some-class
+<?php
+echo "Hello World";
 ```