[英]How to write unit test for method in Angular component using jasmine?
我是 jasmine 单元测试的新手,但我不确定如何编写以及它在 jasmine 中的工作方式。真的面临很多错误。
谁能帮我为下面的代码编写单元测试?
app.component.html
<a href="" class="black" id="upload-template" (click)="uploadTemplate($event)" style="position: relative">
<img style="width: 45px" src="/assets/images/icons/upload (1).png" alt="upload the model" />
<div>Upload Template</div>
<i *ngIf="uploadTempStatus" class="fas fa-check-circle fa-2x upload-check" aria-hidden="true"></i>
</a>
应用程序组件.ts
uploadTemplate(e) {
e.preventDefault();
this.clearMsg();
if (this.selectedModel == null) {
this.messageService.add({ severity: 'error', summary: 'Please option from dropdown', detail: 'Please contact Admin', sticky: true });
} else if (this.selectedModel.name == 'Classification') {
this.router.navigate(['router_one'], { state: { data: this.selectedModel } });
} else {
this.router.navigate(['router_two'], { state: { data: this.selectedModel } });
}
}
规格文件
function newEvent(eventName: string) {
const event = document.createEvent('CustomEvent');
event.initCustomEvent(eventName, false, false, null);
return event;
}
it('should be ok uploadTemplate', async(() => {
const uploadT = fixture.debugElement.query(By.css('#upload-template'));
expect(uploadT).toBeDefined();
const uploadTNativeElement = uploadT.nativeElement;
expect(uploadTNativeElement).toBeDefined();
fixture.detectChanges();
uploadTNativeElement.dispatchEvent(newEvent('click'));
//uploadTNativeElement.dispatchEvent(new Event('click'));
fixture.detectChanges();
fixture.whenStable().then(() => {
spyOn(component, 'uploadTemplate').and.callThrough();
expect(component.uploadTemplate).toHaveBeenCalled();
});
}));
错误:预期间谍 uploadTemplate 已被调用。
监听组件方法uploadTemplate
必须在派发点击事件之前创建。 尝试更改单元测试如下:
it('should be ok uploadTemplate', async(() => {
...
spyOn(component, 'uploadTemplate').and.callThrough();
uploadTNativeElement.dispatchEvent(newEvent('click'));
fixture.detectChanges();
fixture.whenStable().then(() => {
expect(component.uploadTemplate).toHaveBeenCalled();
});
}));
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