Question

我正在创建一个没有Angular 4和RxJs的Web应用程序。在我的代码的一部分中，我使用：Observable.websocket(url);函数创建一个websocket。

这是我的代码：

  /**
   * Tries to open a websocket connection to a given URL.
   * @param url
   * @param subscription Previous subscription to this socket (it may be necessary to close it before proceeding)
   * @returns an object containing the subscription and the websocket subject.
   */
  private openConnection(url: string, subscription: Subscription): { socket$: WebSocketSubject<any>, subscription: Subscription } {
    const socket$ = Observable.webSocket<string>(url);

    // Make sure we unsubscribe from the previous socket if necessary.
    if (subscription) {
      subscription.unsubscribe();
    }

    // Subscribe the recently created socket. Note: this must be done otherwise the socket won't work.
    const newSubscription = socket$.subscribe(
      (msg: string) => this.handleIncomingMessages(msg),
      (error: Error) => this.handleErrors(error),
      () => this.handleComplete());

    return { socket$: socket$, subscription: newSubscription };
  }

我想做的下一件事是为我的websocket创建一个单元测试。但是为了做到这一点，我需要创建一个模拟websocket，以便我可以自由地发送和接收消息。

有谁知道怎么做？是否可以使用Angular MockBackend？

Answer 1

OP提到答案是使用间谍。

fakeSocket = new Subject<any>(); spyOn(Observable, 'webSocket').and.returnValue(fakeSocket);

如何模拟RxJs Observable Websocket进行单元测试

1 个答案: