test(testing): add a test to ensure fakeAsync works with angular2/testing

modules/angular2/test/testing/testing_public_spec.ts

@@ -6,6 +6,7 @@ import {
   ddescribe,
   xdescribe,
   expect,
+  fakeAsync,
   tick,
   beforeEach,
   inject,
@@ -169,6 +170,14 @@ export function main() {
                (value) => { expect(value).toEqual('async value'); });
          }));
 
+      it('should allow the use of fakeAsync',
+         inject([FancyService], fakeAsync((service) => {
+                  var value;
+                  service.getAsyncValue().then(function(val) { value = val; });
+                  tick();
+                  expect(value).toEqual('async value');
+                })));
+
       describe('using beforeEach', () => {
         beforeEach(inject([FancyService],
                           (service) => { service.value = 'value modified in beforeEach'; }));