为什么我的间谍测试失败了？

I have the following test:

我有以下测试:

beforeEach(inject(($document, _DirectiveReadyService_) => {
  DirectiveReadyService = _DirectiveReadyService_;
  foo = jasmine.createSpy('foo');
}));

it('should resolve `foo` subscriber when `foo` is published', () => {
  DirectiveReadyService.subscribe('foo').then(foo);
  DirectiveReadyService.publish('foo');

  expect(foo).toHaveBeenCalled();
});
beforeEa