规格没有期望Angular 7

Question

I am using Jasmine & Karma for unit testing angular app . I have wrote unit tests like this:

describe('#getAll', async () => {
    it('#should return user intergration_tester', inject([UsersService], async(service: UsersService) => {
        await service.getAll('integration_tester', access_token).subscribe(
            user => {
                expect(user[0].firstName).toContain('Integration');
                done();
            })
      }));

      it('#should return error 404', inject([UsersService], (service: UsersService) => {
        service.getAll('integration_tester', '').subscribe(
            user => {expect(user[0].firstName).not.toContain('Integration');},
            err => { expect(err).toContain('error');}
        )
      }));
})

When I execute test cases , I see a message SPEC HAS NO EXPECTATIONS for both test cases . I am wondering why it shows spec has no expectations.

Then I followed the suggested solutions in this post: Spec has no expectations - Jasmine testing the callback function

Using done() :

describe('#getAll', async () => {
    it('#should return user intergration_tester', inject([UsersService], async(service: UsersService, done) => {
        await service.getAll('integration_tester', access_token).subscribe(
            user => {
                expect(user[0].firstName).toContain('Integration');
                done();
            })
      }));

      it('#should return error 404', inject([UsersService], (service: UsersService, done) => {
        service.getAll('integration_tester', '').subscribe(
            user => {expect(user[0].firstName).not.toContain('Integration'); done();},
            err => { expect(err).toContain('error'); done();}
        )
      }));
})

Again, Jasmine tells me that the spec has no expectations

Answer 1

Awaiting a subscription doesn't do anything...

await service.getAll(...).subscribe(...)

You need to convert the observable to a Promise. Also, make sure your observable completes, otherwise you need to get only the first element or the promise will never resolve (let's say that getAll continues to send events or something - but you should get a timeout during the running of the tests). This should do the trick:

describe('#getAll', async () => {
    it('#should return user intergration_tester', inject([UsersService], async (service: UsersService) => {
        const user = await service.getAll('integration_tester', access_token).toPromise();
        expect(user[0].firstName).toContain('Integration');
    }));

    it('#should return error 404', inject([UsersService], async (service: UsersService) => {
        try {
            const user = await service.getAll('integration_tester', '').toPromise();

            expect(user[0].firstName).not.toContain('Integration');
        } catch (err) {
            // why do you also expect an error to be thrown?
            expect(err).toContain('error');
        }
    }));
})