github-api.service.spec.ts

describe('#getUsers', () => {
  it('should return an Observable<User[]>', () => {
    const dummyUsers = [
      { login: 'John' },
      { login: 'Doe' }
    ];

    service.getUsers().subscribe(users => {
      expect(users.length).toBe(2);
      expect(users).toEqual(dummyUsers);
    });

    const req = httpMock.expectOne(`${service.API_URL}/users`);
    expect(req.request.method).toBe("GET");
    req.flush(dummyUsers);
  });
});