Chrome 67.0.3396 (Mac OS X 10.13.5) LoginComponent should call auth.login when passed a valid form with correct credentials onSubmit FAILED
    Expected spy login to have been called.
        at UserContext.<anonymous> src/app/components/login/login.component.spec.ts:87:26)
        at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:388:1)
        at ProxyZoneSpec.push../node_modules/zone.js/dist/zone-testing.js.ProxyZoneSpec.onInvoke node_modules/zone.js/dist/zone-testing.js:288:1)
        at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:387:1)

onSubmit(form: NgForm) {
    if (form.valid) {
      this.authService.login(this.user.username, this.user.password)
      .subscribe(
          data => {
            console.log(data);
            /* TODO: Navigate to holding page etc */
            // Hide any error message that was previously shown
            this.hideErrorMsg = true;
          },
          err => {
            console.log(err);
            // Change error message to be shown
            this.errorMessage = 'Either username or password were incorrect';
            // Show the error message
            this.hideErrorMsg = false;
          }
      );
    }

const validFormGoodCreds = <NgForm>{
    value: {
      password: "somePassword",
      username: "someUsername"
    }
  };

beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [LoginComponent],
      imports: [FormsModule, HttpClientModule]
    }).compileComponents();
authLogoutSpy = spyOn(component['authService'], 'logout');

it('should call auth.login when passed a valid form with correct credentials onSubmit', () => {
    component.onSubmit(validFormGoodCreds);
    expect(authLoginSpy).toHaveBeenCalled();

    // TODO: Check for navigation to holding page
  });