在测试中输入更改后,Angular 4 ngModel未更新

时间:2017-05-22 13:08:54

标签: angular jasmine testbed

我有一个简单的应用程序有1个输入:

@Component({   selector: 'mycomponent',   styles: [

  ],   template: `
    <div class="new-stuff">
      <div>
        <div>
        Name: <input type="text" class="new-stuff-name" [(ngModel)]="stuff.name"/>
        </div>
        <div class="new-stuff-name-error" *ngIf="nameError != null">
          {{nameError}}
        </div>
      </div>

      <button class="new-stuff-save" (click)="checkStuff()">Add idea</button>
    </div>  `, }) 
export class StuffComponent implements OnInit {
   public stuff = {name: ''};
   public allStuff = [];
   public checkStuff() {
    if (this.stuff.name.length === 0) {
      this.nameError = 'The name field cannot be empty';
    }

    if (this.stuff.name.length > 0) {
      this.allStuff.push(this.stuff);
      this.stuff= { name: ''};
    }
  }
 }

当我运行应用程序时,我看到值发生了变化,所有内容看起来都捆绑在了一起,但当我尝试测试时,当我更改输入框中的值并单击按钮时,不显示错误消息,错误消息仍然是显示,因为输入值不会改变。

这是我的Jasmine测试:

describe(`stuff`, () => {
  let comp: StuffComponent ;
  let fixture: ComponentFixture<StuffComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [StuffComponent ],
      schemas: [NO_ERRORS_SCHEMA],
      imports: [FormsModule],
    }).compileComponents();
    fixture = TestBed.createComponent(StuffComponent );
    comp = fixture.componentInstance;
  }));

  describe('adding a new stuff', () => {
    let stuffNameInput;
    let saveButton;
    beforeEach(() => {
      stuffNameInput = fixture.nativeElement
        .querySelectorAll('.new-stuff-name')[0];
      saveButton = fixture.debugElement.nativeElement.querySelector(
        '.new-stuff-save');
    });

    describe('when is successfull', () => {
      beforeEach(async(() => {
        stuffNameInput.value = 'New Stuff';
        stuffNameInput.dispatchEvent(new Event('input'));
        saveButton.click();
        fixture.detectChanges();
      }));
      it('should display an error', () => {
        let errorDiv = fixture.nativeElement
          .querySelectorAll('.new-stuff-desc-error');
        expect(errorDiv.length)
          .toBe(0, 'Error message displayed');
      });
    });
  });
});

我尝试了多种方法,用fakeAsync替换async,调用tick函数,在fixture.whenStable()中移动click。然后阻塞,将div的检查移动到fixture.whenStable()。然后阻止。到目前为止没有任何工作。

我正在使用角度

的版本4.1.3

2 个答案:

答案 0 :(得分:1)

回答我自己的问题来记录问题。

使用stuff.name作为ngModel效果不佳。

我将stuff.name更改为name并开始工作

答案 1 :(得分:0)

我发现mousedown比click()更适合我的测试:

    const e: Event = document.createEvent('HTMLEvents');
    e.initEvent('mousedown', false, true);
    itemElements[1].nativeElement.dispatchEvent(e);