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我在我们的Angular应用中实现了一个测试套件(Karma + Jasmine),但是我遇到了这个特定情况的问题。Angular + Jasmine:使用spyOn测试子组件的输出
比方说,我需要测试一个名为MessageComponent的组件,它发出一个按钮的事件。如果我从父母测试它,我如何确保事件正确发射?
这里的例子:
@Component({
selector: "cw-message",
template: `
<div #messageElement>
{{message.title}}
<button class="close icon" (click)="close($event, messageElement)">Close</button>
</div>`
})
class MessageComponent {
@Input() message;
@Output() onClose:EventEmitter<boolean> = new EventEmitter();
public close(event:Event, element:HTMLElement):void {
this.onClose.emit(true);
}
}
有这样的分量,我想用下面的代码进行测试:
describe("MessageComponent",() => {
let comp:TestComponent;
let fixture:ComponentFixture<TestComponent>;
let de:DebugElement;
@Component({
template: `
<div>
<cw-message class="first" [message]="message"></cw-message>
</div>`
})
class TestComponent {
@ViewChild(MessageComponent) messageComponent:MessageComponent;
public message = {
title: "My message",
content: "The content of the message",
duration: 1000,
};
ngAfterViewInit() {};
ngAfterContentInit() {};
ngAfterViewChecked() {}
ngAfterContentChecked() {};
}
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [ FormsModule ],
declarations: [ TestComponent, MessageComponent, ],
}).compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(TestComponent);
comp = fixture.componentInstance;
de = fixture.debugElement;
fixture.detectChanges();
});
fit("Should close message",() => {
spyOn(comp.messageComponent, "close");
spyOn(comp.messageComponent.onClose, "emit");
let messageDiv:HTMLElement = fixture.nativeElement.querySelector(".message");
let closeBtn = fixture.nativeElement.querySelector(".close.icon");
closeBtn.click();
expect(comp.messageComponent.onClose.emit).toHaveBeenCalledWith(true);
});
});
但我始终有以下例外结束了:
Expected spy emit to have been called with [ true ] but it was never called.
这让我思考......是否有可能通过这种方式来测试子组件?我究竟做错了什么?
'comp.messageComponent.onClose.emit'永远不会被调用,因为您已经重写了'comp.messageComponent'.close方法 – yurzui
不需要父测试组件;实例化孩子,订阅输出字段然后触发点击事件。 – jonrsharpe
@jonrsharpe这就是我所做的,但它抛出了相同的异常:'期望的间谍发出已被调用与[真],但它从来没有被称为。' – user4068063