[英]How to test an observable in angular/jasmine when the observable next is called before the observable is returned, due to mocks
I have the following code 我有以下代码
login(user: string, pass: string): Observable<User> {
const subject = new Subject<User>();
this.authApi.authTokenPost(user, pass)
.subscribe((token: OAuthAccessToken) => {
this.tokenService.save(token);
this.userApi.fetch()
.subscribe((user: User) => {
subject.next(user);
});
}) // removed error handling for brevity
return subject;
}
The problem of course is that I need two api calls, so back then I solved it by creating a new subject and returning that. 问题当然是我需要两个api调用,所以当时我通过创建一个新主题并返回它来解决它。
Now I'm writing the functional test.. 现在我正在编写功能测试..
const user: User = {id: '1234'};
const authApi = jasmine.createSpyObj('AuthApi', ['authTokenPost']);
const tokenService = jasmine.createSpyObj('TokenService', ['save']);
const userApi = jasmine.createSpyObj('UserService', ['fetch']);
beforeEach(() => {
authApi.authTokenPost.and.returnValue(of(oauthAccessToken));
userService.fetch.and.returnValue(of(user));
authenticationService = new AuthService(authApi, tokenService, userApi);
});
it('should login', (done) => {
authService.login('user', 'pass')
.subscribe((user2) => {
expect(user2).toEqual(user);
done();
})
});
The problem is that because of the mocks, the subscribe is called immediately, and therefore the subject.next(user)
is called BEFORE the subject is even returned.. 问题是因为模拟,会立即调用subscribe,因此在主题被返回之前调用
subject.next(user)
。
Does anyone know a good way around this? 有没有人知道这方面的好方法?
I found a solution: 我找到了解决方案:
authApi.authTokenPost.and.returnValue(of(oauthAccessToken).pipe(delay(0)));
By delaying any of the mock observables even for 0 microseconds, the call becomes async and therefore executes after returning the subject. 通过延迟任何模拟可观察量甚至0微秒,调用变为异步,因此在返回主题后执行。
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