adding missing group test

Test/Case/AllThickboxTestsTest.php

@@ -0,0 +1,17 @@
+<?php
+class AllThickboxTestsTest extends PHPUnit_Framework_TestSuite {
+
+/**
+ * Suite define the tests for this suite
+ *
+ * @return void
+ */
+	public static function suite() {
+		$suite = new CakeTestSuite('All Thickbox test');
+
+		$path = CakePlugin::path('Thickbox') . 'Test' . DS . 'Case' . DS;
+		$suite->addTestDirectoryRecursive($path);
+
+		return $suite;
+	}
+}