Unit tests: Change the parent class to avoid a deprecated class.

This is necessary to make it work in PHP 5.3 (as well as PHP 4).

admin/report/unittest/ex_simple_test.php

@@ -22,13 +22,13 @@ require_once($CFG->libdir . '/simpletestlib/test_case.php');
  * them into a group test.
  * @package SimpleTestEx
  */
-class AutoGroupTest extends GroupTest {
+class AutoGroupTest extends TestSuite {
 
     var $thorough;
     var $showsearch;
 
     function AutoGroupTest($showsearch, $thorough, $test_name = null) {
-        $this->GroupTest($test_name);
+        $this->TestSuite($test_name);
         $this->showsearch = $showsearch;
         $this->thorough = $thorough;
     }