diff --git a/modules/angular2/src/test_lib/test_lib.dart b/modules/angular2/src/test_lib/test_lib.dart
index c0e2466040..043e5d6e8b 100644
--- a/modules/angular2/src/test_lib/test_lib.dart
+++ b/modules/angular2/src/test_lib/test_lib.dart
@@ -114,6 +114,7 @@ class NotExpect extends gns.NotExpect {
 
   void toEqual(expected) => toHaveSameProps(expected);
   void toBePromise() => _expect(actual is Future, equals(false));
+  void toBeNull() => _expect(actual == null, equals(false));
   Function get _expect => gns.guinness.matchers.expect;
 }