无法在 jasmine 单元测试中使用组件的只读属性

Question

我的组件中有一个 @Output 事件发射器，为了测试它发出的值，我做了这样的事情：

component.uploadFinished = {emit: jasmine.createSpy()};
---
---
expect(component.uploadFinished.emit).toHaveBeenCalledWith({response: jasmine.any(HttpResponse)})

这里不允许我写 component.uploadFinished 因为它说它是只读的属性。任何帮助将不胜感激。这里的组件也是 TestComponent

类型

编辑 1：

这是我的 ts 文件和我正在为其编写测试的函数

  async fileUpload() {

    this.fileUploadStatus = 'uploading';
    const file = this.uploadFile[0];
    const formData = new FormData();
    formData.append(this.uploadConfig.fieldName, file, file.name);

    const req = new HttpRequest(this.uploadConfig.method, this.uploadConfig.url, formData, {
      headers: this.uploadConfig.headers
    });
    try {
      const response = await this.http.request(req).pipe(
        retry(3)
      ).toPromise() as HttpResponse<any>;
      this.fileUploadStatus = 'success';
      this.uploadFinished.emit({response});
    } catch (error) {
      this.uploadFinished.emit({error});
    }
  }

这是单元测试

it('should emit success response', async () => {

    component.uploadFinished = {emit: jasmine.createSpy()};
    // eslint-disable-next-line max-len
    component.uploadConfig = {
      method: 'POST',
      url: '/api/attachments',
      fieldName: 'file',
      // eslint-disable-next-line @typescript-eslint/naming-convention
      headers: new HttpHeaders({ 'Accept': 'application/json' })
    };

    component.handleFiles(createFileList(['matching.fmwr']));
    fixture.detectChanges();

    component.fileUpload(); // trigger upload

    // mock request
    const attachment = { id: 201, fileName: 'matching.fmwr' };
    const req = httpMock.expectOne('/api/attachments');
    req.flush(attachment);
    httpMock.verify();

    // api call is async function and there is time delay in emit
    await (new Promise((resolve, reject) => {
      setTimeout(()=>{
        expect(component.uploadFinished.emit).toHaveBeenCalledWith({response: jasmine.any(HttpResponse)})
      return resolve(true);
      }, 1000);
    }))
  });

我必须使用 setTimeout，因为异步函数 emit 没有按需要被调用。如果可以建议更好的方法，我们将不胜感激。

Answer 1

您可以禁用 TypeScript 检查一行代码：

// @ts-ignore
expect(component.uploadFinished.emit).toHaveBeenCalledWith({response)

注意：我建议您只在规范文件中使用它。总的来说这是最后的手段

Answer 2

我通过更改

解决了这个问题

component.uploadFinished = {emit: jasmine.createSpy()};

至

spyOn(component.uploadFinished, 'emit');

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