Spec对Angular 7没有期望

Question

我正在使用 Jasmine 和 Karma 对 angular app 进行单元测试。我写过这样的单元测试：

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，我看到一条消息 SPEC HAS NO EXPECTATIONS for both test cases。我想知道为什么它显示规范没有期望。

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();}
        )
      }));
})

Jasmine 再次告诉我spec has no expectations

Answer 1

等待订阅没有任何作用...

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

您需要将 observable 转换为 Promise。另外，请确保您的 observable 完成，否则您只需要获取第一个元素，否则承诺将永远无法解决（假设 getAll 继续发送事件或其他东西 - 但您应该在测试运行期间获得超时）。这应该可以解决问题：

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');
        }
    }));
})