Tests: Add docblocks for Basic_Object and Basic_Subclass classes.

Props DylanAuty.
See #37523.

git-svn-id: https://develop.svn.wordpress.org/trunk@38444 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/class-basic-subclass.php

@@ -1,3 +1,15 @@
 <?php
+/**
+ * Unit Tests: Basic_Subclass class
+ *
+ * @package WordPress
+ * @subpackage UnitTests
+ * @since 4.7.0
+ */
 
+/**
+ * Class used to test accessing methods and properties.
+ *
+ * @since 4.0.0
+ */
 class Basic_Subclass extends Basic_Object {}