Angular Integration測試：測試發出其他組件的事件時調用的函數，如何模擬事件數據？

Question

在我的組件AI中，有一個功能可以根據從組件B發出的數據來更新視圖。我不想集成組件B並進行實際操作，即使此測試太復雜了。

我只想調用該函數並將數據傳遞給該函數。 問題是，將數據作為“事件”發送到組件A中的函數似乎不起作用：

  it('should update the video with the data from the edit component', () => {
    let event;
    event.title = 'New Title';
    event.description = 'New Description';
    event.link = 'New Link';
    event.videoCategory = 'New Category';
    event.categories = '2';
    event.a14Only = 0;

    component.updateVideoCard(event);
    fixture.detectChanges();

    expect(component.videoTitle).toBe('New Title');
    expect(component.videoLink).toBe('New Link');
    expect(component.videoDescription).toBe('New Description');
    expect(component.videoCategory).toBe('New Category');
    expect(component.categoryID).toBe('2');
    expect(component.a14Only).toBe('0');
    expect(component.editDisabled).toBeTruthy();
  });

並且該事件最終顯示為“未定義”。 我也嘗試過使它成為一個名為'event'的javascript對象，該對象內部具有鍵-值對，但也沒有產生任何運氣。

component.updateEvent（data）代碼：

updateVideoCard(event) {
    this.videoTitle = event.title;
    this.videoDescription = event.description;
    this.videoLink = event.link;
    this.videoCategory = event.category;
    this.categoryID = event.categories;
    if (event.a14Only === 1) {
      this.a14Only = true;
    } else {
      this.a14Only = false;
    }
    this.enableEditor = false;
    this.notification.done(`${this.videoTitle} updated successfully.`);
  }

Answer 1

我已經看過DebugElement.triggerEvent，但是不幸的是文檔已經過時，而且我自己沒有辦法確定如何做到這一點。 無論如何，它似乎也需要集成第二個組件。

我最終集成了這兩個組件，並使用來自第二個組件的標准JSON對象觸發了它，如下所示：

describe('VideoCardComponent', () => {
  let component: VideoCardComponent;
  let fixture: ComponentFixture<VideoCardComponent>;
  let fixture2: ComponentFixture<EditVideoComponent>;
  let component2: EditVideoComponent;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        MatCardModule,
        MatButtonModule,
        BrowserAnimationsModule,
        FontAwesomeModule,
        BrowserModule,
        FlexLayoutModule,
        RouterTestingModule,
        ReactiveFormsModule,
        FormsModule,
        MatSelectModule,
        MatOptionModule,
        MatInputModule,
        MatSlideToggleModule
      ],
      declarations: [VideoCardComponent, SafepipePipe, EditVideoComponent],
      providers: [
        { provide: RestService, useClass: RestStub },
        { provide: NotificationService, useClass: NotificationStub }
      ],
      schemas: [NO_ERRORS_SCHEMA]
    })
      .compileComponents()
      .then(() => {
        fixture2 = TestBed.createComponent(EditVideoComponent);
        fixture = TestBed.createComponent(VideoCardComponent);
        component = fixture.componentInstance;
        component2 = fixture2.componentInstance;
        fixture2.detectChanges();
        fixture.detectChanges();
      });
  }));

您可以看到我剛剛將其命名為component2和Fixture2，並在相同的1個測試床上添加了兩者的依賴關系。

我可能會給它們命名更相關的名稱，而不是component和component2。

固定測試：

it('should update the video with the data from the edit component', () => {
    const data = [
      {
        title: 'New Title',
        description: 'New Description',
        link: 'New Link',
        category: 'New Category',
        categories: '2',
        a14Only: 0
      }
    ];

    component2.updateVideoCard.subscribe(newVideo => {
      component.updateVideoCard(newVideo);
      expect(component.videoTitle).toBe('New Title');
      expect(component.videoLink).toBe('New Link');
      expect(component.videoDescription).toBe('New Description');
      expect(component.videoCategory).toBe('New Category');
      expect(component.categoryID).toBe('2');
      expect(component.a14Only).toBeFalsy();
      expect(component.editDisabled).toBeFalsy();
    });

    component2.updateLocalVideoData(data);

    fixture2.detectChanges();
    fixture.detectChanges();
  });