角度测试和ngModel

时间:2018-01-11 10:50:13

标签: angular testing ngmodel

我正在使用Angular编写我的第一个组件测试之一,并且我在使ngModel绑定工作方面遇到了一些困难。 这是我的测试模块定义:

beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        LdapLoginComponent,
      ],
      imports: [
        CommonModule,
        FormsModule,
        NoopAnimationsModule,
        MatInputModule,
        MatFormFieldModule,
        RouterTestingModule,
      ],
      providers: [
        {
          provide: AuthorizationService,
          useValue: { login() {} },
        },
      ]
    }).compileComponents();
  }));

这是我的测试用例:

it('should bind form fields with class', fakeAsync(() => {
    // Given
    const username = 'username';
    const password = 'password';
    const usernameField = de.query(By.css('input[name=username]')).nativeElement;
    const passwordField = de.query(By.css('input[name=password]')).nativeElement;

    // When
    usernameField.value = username;
    passwordField.value = password;
    usernameField.dispatchEvent(new Event('input'));
    passwordField.dispatchEvent(new Event('input'));
    tick();
    fixture.detectChanges();

    // Then
    expect(comp.username).toEqual(username);
    expect(comp.password).toEqual(password);
  }));

我的组件类:

export class LdapLoginComponent {

  username: string;
  password: string;
  errorMessage: string;
  submitDisabled = false;

  constructor(
    private authorizationService: AuthorizationService,
    private router: Router,
  ) {
  }

  login(): void {
    delete this.errorMessage;
    this.submitDisabled = true;
    this.authorizationService.login(AuthorizationProvider.LDAP, this.username, this.password)
      .subscribe(
        () => {
          this.router.navigate(['/']);
        },
        (err: Error) => {
          this.errorMessage = err.message;
          this.submitDisabled = false;
        },
      );
  }

}

我的组件模板:

<form class="form-container" (submit)="login()">
  <mat-form-field color="warn">
    <input
    matInput
    type="text"
    name="username"
    placeholder="Insert your username"
    [(ngModel)]="username"
    required
    i18n-placeholder="@@input.placeholder.username">
  </mat-form-field>
  <mat-form-field color="warn">
    <input
      matInput
      type="password"
      name="password"
      placeholder="Insert your password"
      [(ngModel)]="password"
      required
      i18n-placeholder="@@input.placeholder.password">
  </mat-form-field>
  <button
    mat-raised-button
    type="submit"
    color="warn"
    [disabled]="submitDisabled"
    i18n="@@input.submit">Submit</button>
</form>
<article>{{errorMessage}}</article>

我正在更改测试中的用户名和密码字段的值,并且我希望相应地更新我的类的用户名和密码字段。如果我在浏览器中手动测试,但测试中没有测试,那么一切都很顺利。

有什么想法吗?

感谢。

2 个答案:

答案 0 :(得分:1)

对于mat-input字段,我们需要在更改输入之前执行focus():

it('should bind form fields with class', fakeAsync(() => {
// Given
const username = 'username';
const password = 'password';
const usernameField = de.query(By.css('input[name=username]')).nativeElement;
const passwordField = de.query(By.css('input[name=password]')).nativeElement;

usernameField.focus();
passwordField.focus();

// When
usernameField.value = username;
passwordField.value = password;
usernameField.dispatchEvent(new Event('input'));
passwordField.dispatchEvent(new Event('input'));
tick();
fixture.detectChanges();

// Then
expect(comp.username).toEqual(username);
expect(comp.password).toEqual(password);

}));

答案 1 :(得分:0)

问题是在调用dispatchEvent之前,实际上并没有设置输入字段的值。您正在直接设置组件属性。

comp.username = username;
usernameField.dispatchEvent(new Event('input'));

应该是

let usernameFieldElement = usernameField.nativeElement;
usernameFieldElement.value = username;
usernameField.dispatchEvent(new Event('input'));

和密码相同。

另一件事是你要同时测试三件事,将文本输入到输入区域,单击按钮会运行登录和登录功能本身。我建议将这些分为三个断言。

  1. 如上所述设置字段并检查数据绑定。

  2. 点击按钮并监视登录功能以检查它是否已被调用。

  3. 设置实际组件属性并直接调用logon()并检查您的navigateSpy是否已正确调用。

  4. 这样一来,如果出现问题,您将能够更轻松地找到它。