Question

我想触发此catch块并确认def gWord(s): tessr = "".join([ch for ch in s if character(ch) or ch =="'"]) print (tessr) gWord(" !,Nord's** ")运行：

handleError()

utilsSvc类：

@Injectable()
export class JwtService {
    private actionUrl: string;
    private headers: Headers;


    constructor(private http: Http, private configurationService: ConfigurationService, private _utilsSvc: UtilitiesService) {}

    getToken() {
        if (this.configurationService.config) {
            return this.http.post(this.configurationService.config.jwtUrl, { "brand": "IAG" })
                .map(this._utilsSvc.parseJson)
                .catch(this.handleError);
        }   
    }

    handleError(error: any) {
        let errorStatus = error.status;
        return Observable.throw(errorStatus);
    }
}

我试图传递它无效的json导致错误被捕获：

@Injectable()
export class UtilitiesService {

    constructor(private http: Http) { }

    fetchFile(url) {
        return this.http.get(url)
            .toPromise();
    }

    parseJson(response: Response) {
        return response.json();
    }
}

我收到此错误：

TypeError：无法读取属性＆＃39;符号（Symbol.iterator）＆＃39;未定义的

如何使catch块捕获错误？

这是我的整个测试文件：

it("Should handle error", () => {
    let resOp = new ResponseOptions({
        body: "invalid json"
    });
    mockHttpResponse = new Response(resOp);
    mockBackend.connections.subscribe(connection => {
        connection.mockRespond(mockHttpResponse);
    });
    spyOn(jwtService, 'handleError');
    jwtService.getToken().subscribe((res) => {
        expect(jwtService.handleError).toHaveBeenCalled();
    });
});

Answer 1

问题在这里

spyOn(jwtService, 'handleError');

spyOn将覆盖此方法，因此当catch期望您返回一个observable时，它不会返回任何内容。

要解决此问题，您需要从该方法返回

it("Should handle error", () => {
        let resOp = new ResponseOptions({
            body: "sdvhfujvn"
        });
        mockHttpResponse = new Response(resOp);
        mockBackend.connections.subscribe(connection => {
            connection.mockRespond(mockHttpResponse);
        });
        spyOn(jwtService, 'handleError').and.callFake(function () {
            return Observable.from("fake error");
        });
        jwtService.getToken()
            .subscribe((res) => {
                expect(jwtService.handleError).toHaveBeenCalled();
            });
    });

此测试可行，但我不确定此测试是否有意义

TypeError：无法读取属性＆＃39; Symbol（Symbol.iterator）＆＃39;未定义的RxJS

1 个答案: