具有多重签名的Angular Mocking Service

在我的Angular项目中，所有的Rest服务都定义如下，它们有4个签名

public commandsGet(oem: string, countryCode?: string, observe?: 'body', reportProgress?: boolean): Observable<CommandGetResponse>;
    public commandsGet(oem: string, countryCode?: string, observe?: 'response', reportProgress?: boolean): Observable<HttpResponse<CommandGetResponse>>;
    public commandsGet(oem: string, countryCode?: string, observe?: 'events', reportProgress?: boolean): Observable<HttpEvent<CommandGetResponse>>;
    public commandsGet(oem: string, countryCode?: string, observe: any = 'body', reportProgress = false): Observable<any> {

        return this.httpClient.get<CommandGetResponse>(`${this.basePath}/${oem}/commands/`, params);
    }

我正在编写一些测试并试图模拟该服务，但我收到错误消息:"类型为‘Observable’的参数不可赋值给类型为‘Observable；HttpEvent&gt；’的参数."

it('should return expected commands', (done: DoneFn) => {
            const mockResponse: CommandGetResponse  = {
                data: [
                    { commandname: 'A' },
                    { commandname: 'B' }],
                count: 2
            };
           
            spyOn(commandService, 'commandsGet').and.returnValue(of(mockResponse) as Observable<CommandGetResponse>);
            component.ngOnInit();
            fixture.detectChanges();

            expect(component.commands).toEqual(mockResponse.data);
        });

我也试过了

spyOn(commandService, 'commandsGet').and.returnValue(of(mockResponse));

``

Then I'm getting "Argument of type 'Observable<CommandGetResponse>' is not assignable to parameter of type 'Observable<HttpEvent<CommandGetResponse>>'.

当我定义:

const httpResponse = new HttpResponse({ body: mockResponse });
spyOn(commandService, 'commandsGet').and.returnValue(of(httpResponse));

我没有收到任何错误，但我的测试失败，因为返回的对象不是"CommandGetResponse"类型

这方面的任何帮助都将是受欢迎的.

谢谢