diff --git a/plugin/sns/facebook/tests/tests.php b/plugin/sns/facebook/tests/tests.php
index d261cce11..e0777e54f 100644
--- a/plugin/sns/facebook/tests/tests.php
+++ b/plugin/sns/facebook/tests/tests.php
@@ -15,6 +15,10 @@
  * under the License.
  */
 
+if( ! class_exists('PHPUnit_Framework_TestCase') ){
+    return;
+}
+
 class PHPSDKTestCase extends PHPUnit_Framework_TestCase {
   const APP_ID = '117743971608120';
   const SECRET = '9c8ea2071859659bea1246d33a9207cf';