Spec没有期望Angular 7

Question

我正在使用Jasmine＆Karma进行角度应用程序的单元测试。我写了这样的单元测试：

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');}
        )
      }));
})

当我执行测试用例时，我看到两个测试用例的消息SPEC HAS NO EXPECTATIONS。我想知道为什么它显示规格没有期望。

然后我按照这篇文章中建议的解决方案：Spec has no expectations - Jasmine testing the callback function

使用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();}
        )
      }));
})

再一次，Jasmine告诉我spec has no expectations

Answer 1

等待订阅没有做任何事......

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

您需要将observable转换为Promise。另外，确保你的observable完成，否则你只需要获得第一个元素，或者promise永远不会解析（假设getAll继续发送事件或其他东西 - 但是你应该在测试运行期间得到超时）。这应该做的伎俩：

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');
        }
    }));
})