Angular 集成测试：测试一个在其他组件发出事件时调用的函数，如何模拟事件数据？

Question

在我的组件 A 中，我有一个函数可以根据组件 B 发出的数据更新视图。我不想集成组件 B 并制作一个实际的组件，即使这对于这个测试来说太复杂了。

我只想调用函数并将数据传递给函数。问题是，将数据作为“事件”发送到组件 A 中的函数似乎不起作用：

  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();
  });

该事件以“未定义”结束。我还尝试将其设为一个名为“事件”的 javascript 对象，其中包含键值对，但也没有成功。

component.updateEvent(data) 代码：

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

我查看了 DebugElement.triggerEvent，但不幸的是，文档已经过时，而且我自己也没有很幸运地弄清楚如何去做。无论如何，它似乎也需要集成第二个组件。

我最终集成了这两个组件，并使用来自第二个组件的标准 JSON 对象来触发它，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();
      });
  }));

您可以看到我刚刚将其命名为 component2 和 fixture2 并在同一个测试台中添加了两者的依赖项。

我可能会将它们命名为更相关的名称，而不是 component 和 component2。

固定测试：

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();
  });