Set gPageCompleted so Spider can detect test completion, no bug.

js/tests/js-test-driver-end.js

@@ -2,4 +2,9 @@ if (window.opener && window.opener.runNextTest)
 {
   setTimeout('window.opener.runNextTest()', 250);
 }
+else
+{
+  gPageCompleted = true;
+}
+