角集成测试:测试当其他组件发出事件时调用的函数，我如何模拟事件数据

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并生成实际的视图，即使这对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();
});

而该事件最终以"未定义"结束。我还尝试过将其制作成一个名为"event"的javascript对象，其中包含键值对，但也没有成功。

component.updateEvent(数据(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

我看过DebugElement.triggerEvent，但不幸的是，文档已经过时了，我自己也没怎么弄清楚该怎么做。它似乎还需要集成第二个组件。

我最终集成了这两个组件，并使用第二个组件的标准JSON对象触发它，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1测试台中添加了两者的依赖项。

我可能会给它们命名一些更相关的名称，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();
});