角度单元测试-未报告带有承诺的失败测试

Question

我正在测试一种返回承诺的服务方法。 当调度动作A, B, C时，诺言就解决了。派发AFail, BFail, CFail之一时，它被拒绝。

当测试通过时，它可以很好地完成并报告结果。但是，如果测试错误，则永远不会报告失败的测试，并且浏览器会无限期挂起。

这是测试代码：

// Here ommited TestBed declaration etc. 

describe('initializeApp', () => {
    let initializePromise: Promise<any>;
    let promiseResolved: boolean;
    beforeEach(() => {
      initializePromise = appInitializerService.initializeApp();
      promiseResolved = undefined;
      initializePromise.then(() => promiseResolved = true).catch(() => promiseResolved = false);
    });

    it('should reject when A, BFail, C are dispatched (1 fail)',
      fakeAsync(() => {
        store.dispatch(new A());
        store.dispatch(new BFail());
        store.dispatch(new C());
        flushMicrotasks();

        console.log(promiseResolved); // log false as the promise is rejected

        expect(promiseResolved).toEqual(true); // test fails and the result is never reported
        // expect(promiseResolved).toEqual(false); // test passes and all is working
      }));
});

我尝试用tick而不是flushMicrotasks玩，直接打电话给fail，但无济于事。

为什么测试没有报告失败？