Typescript 如何在测试中模拟 Angular 4.3 httpClient 的错误响应

我的血压低于interceptor auth-interceptor.service.ts

import {Injectable, Injector} from '@angular/core';
import {HttpErrorResponse, HttpEvent, HttpHandler, HttpInterceptor, HttpRequest} from '@angular/common/http';
import {Observable} from 'rxjs/Observable';
import {Cookie} from './cookie.service';
import {Router} from '@angular/router';
import {UserService} from './user.service';
import {ToasterService} from '../toaster/toaster.service';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
    constructor(private injector: Injector) {}

    private handleError(err: HttpErrorResponse): Observable<any> {
        let errorMsg;
        if (err.error instanceof Error) {
            // A client-side or network error occurred. Handle it accordingly.
            errorMsg = `An error occurred: ${err.error.message}`;
        } else {
            // The backend returned an unsuccessful response code.
            // The response body may contain clues as to what went wrong,
            errorMsg = `Backend returned code ${err.status}, body was: ${err.error}`;
        }
        if (err.status === 401 || err.status === 403) {
            this.injector.get(UserService).purgeAuth();
            this.injector.get(ToasterService).showError(`Unauthorized`, errorMsg);
            this.injector.get(Router).navigateByUrl(`/login`);
        }
        console.error(errorMsg);
        return Observable.throw(errorMsg);
    }

    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        // Clone the request to add the new header.
        const authReq = req.clone({headers: req.headers.set(Cookie.tokenKey, Cookie.getToken())});
        // Pass on the cloned request instead of the original request.
        return next.handle(authReq).catch(err => this.handleError(err));
    }
}

现在我试图模拟http.get来抛出错误，这样方法handleError就可以处理错误消息.

下面是我对测试用例auth-interceptor.service.specs.ts的处理方法

import {async, inject, TestBed} from '@angular/core/testing';

import {AuthInterceptor} from './auth-interceptor.service';
import {ApiService} from './api.service';
import {HttpClientTestingModule, HttpTestingController} from '@angular/common/http/testing';
import {environment} from '../../../environments/environment';

describe(`AuthInterceptor`, () => {
    const somePath = `/somePath`;

    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [HttpClientTestingModule],
            providers: [AuthInterceptor, ApiService]
        });
    });

    it(`should be created`, inject([AuthInterceptor], (service: AuthInterceptor) => {
        expect(service).toBeTruthy();
    }));


    it(`should log an error to the console on error on get()`, async(inject([ApiService, HttpTestingController],
        (apiService: ApiService, httpMock: HttpTestingController) => {
            spyOn(console, 'error');
            apiService.get(somePath).subscribe((res) => {
                console.log(`in success:`, res);
            }, (error) => {
                console.log(`in error:`, error);
            });

            const req = httpMock.expectOne(`${environment.apiUri}${somePath}`);
            req.flush({
                type: 'ERROR',
                status: 404,
                body: JSON.stringify({color: `blue`})
            });
            expect(console.error).toHaveBeenCalled();
        }))
    );
});

在刷新响应时，我不确定如何刷新错误响应，以便在我的拦截器中调用方法handleError，最终调用console.error.文档中没有任何例子可以说明我的情况.任何帮助或建议都将不胜感激.