Error: Expected one matching request for criteria "Match by function: ", found none

Question

I have a userService.spec.ts file that I want to test.The code goes this way. It calls a get function that calls the ADMIN_API_URL.I tried testing the given file but got an error that is mentioned in the title. My user.service.spec.ts file.

 describe('Service: User service', () => {
 let httpMock: HttpTestingController;
 let userService: UserService;
 let url: string;

  beforeEach(() => {
   TestBed.configureTestingModule({
    imports: [HttpClientTestingModule],
     providers: [
    { provide: AUTH_API_URL, useValue: 'https://auth.example.com/api/' 
      },
    { provide: SSO_API_URL, useValue: 'https://sso.example.com/auth/api/' },
    { provide: WIT_API_PROXY, useValue: 'https://wit.example.com/api/'},
    { provide: ADMIN_API_URL, useValue: 'https://admin.example.com/api/'},
    { provide: REALM, useValue: 'realm' },
    Broadcaster,
    Logger,
    AuthenticationService,
    HttpHandler,
    UserService
  ]
});
httpMock = TestBed.get(HttpTestingController);
url = TestBed.get(ADMIN_API_URL);
userService = TestBed.get(UserService);
 });

 it('Get user by user name returns valid user', (done) => {
const testUser = [{
  'attributes': {
    'fullName': 'name',
    'imageURL': '',
    'username': 'myUser'
  },
  'id': 'userId',
  'type': 'userType'
}];
userService.getUsersByName('name').subscribe((user) => {
  expect(user[1].id).toEqual('userId');
  done();
});
const req = httpMock.expectOne(request => request.method === 'GET'
&& request.url === `${url}search/users?q=name`);
req.flush({data: testUser});
 });
});

I tried testing all the things that I had in my mind but still can't find what is wrong with my code.Am I doing any silly mistake?.

Answer 1

Most likely the URLs are not matching. The expectOne condition (request.url === `${url}search/users?q=name`) is likely failing. You can log your mock request URL to see what the actual URL is.

const req = httpMock.expectOne(request => {
    console.log("url: ", request.url);
    return true;
});

Answer 2

In my case the tested service had a dependency on some other service, which I mocked. The mocked dependency missed mocked function which was called by the tested service. This error was silently swallowed.

Once the mocked function has been added, it started to work correctly.