我的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: ${err.error}`;
}
if (err.status === 401 || err.status === 403) {
this.injector.get(UserService).purgeAuth();
this.injector.get(ToasterService).showError(`Unauthorized`, errorMsg);
this.injector.get(Router).navigateByUrl(`/login`);
}
console.error(errorMsg);
return Observable.throw(errorMsg);
}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
// Clone the request to add the new header.
const authReq = req.clone({headers: req.headers.set(Cookie.tokenKey, Cookie.getToken())});
// Pass on the cloned request instead of the original request.
return next.handle(authReq).catch(err => this.handleError(err));
}
}
现在我试图模仿http.get
抛出错误,以便方法handleError
控制错误消息。
以下是我对测试用例auth-interceptor.service.specs.ts
import {async, inject, TestBed} from '@angular/core/testing';
import {AuthInterceptor} from './auth-interceptor.service';
import {ApiService} from './api.service';
import {HttpClientTestingModule, HttpTestingController} from '@angular/common/http/testing';
import {environment} from '../../../environments/environment';
describe(`AuthInterceptor`, () => {
const somePath = `/somePath`;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [AuthInterceptor, ApiService]
});
});
it(`should be created`, inject([AuthInterceptor], (service: AuthInterceptor) => {
expect(service).toBeTruthy();
}));
it(`should log an error to the console on error on get()`, async(inject([ApiService, HttpTestingController],
(apiService: ApiService, httpMock: HttpTestingController) => {
spyOn(console, 'error');
apiService.get(somePath).subscribe((res) => {
console.log(`in success:`, res);
}, (error) => {
console.log(`in error:`, error);
});
const req = httpMock.expectOne(`${environment.apiUri}${somePath}`);
req.flush({
type: 'ERROR',
status: 404,
body: JSON.stringify({color: `blue`})
});
expect(console.error).toHaveBeenCalled();
}))
);
});
当刷新响应时,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
并最终调用console.error
。文档对我的情况没有任何例子。任何帮助或建议表示赞赏。
答案 0 :(得分:37)
expectOne
类中的HttpTestingController
方法返回TestRequest
个对象。此TestRequest类具有flush
方法,可用于传递
成功和不成功的回复。
我们可以通过返回一个正文和一些额外的响应头(如果有的话)来解决请求。可以找到相关信息here。
现在,回过头来说明如何做到这一点。您可以根据自己的使用情况自定义以下代码段。
http = TestBed.get(HttpTestingController);
let response: any;
let errResponse: any;
const mockErrorResponse = { status: 400, statusText: 'Bad Request' };
const data = 'Invalid request parameters';
apiService.get(somePath).subscribe(res => response = res, err => errResponse = err);
http.expectOne('url/being/monitored').flush(data, mockErrorResponse);
expect(errResponse).toBe(data);
注意:在撰写此评论时,statusText
需要mockErrorResponse
。相关信息可以在here找到。
P.S。:error
类的TestRequest
方法可用于模拟测试用例中的网络错误,因为它需要一个Error实例。以下代码段显示了。
http.expectOne(someUrl).error(new ErrorEvent('network error'));