[英]How to mock RxJs Observable Websocket for Unit Tests
我正在使用Angular 4和RxJs創建一個Web應用程序。 在代碼的一部分中,我將使用以下方法創建一個Websocket: Observable.websocket(url);
功能。
這是我的代碼:
/**
* 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為Websocket創建一個單元測試。 但是,為了做到這一點,我需要創建一個模擬websocket,以便我可以自由地發送和接收來自它的消息。
有誰知道該怎么做? 是否可以為此使用Angular MockBackend
?
正如OP提到的,答案是使用間諜。
fakeSocket = new Subject<any>(); spyOn(Observable, 'webSocket').and.returnValue(fakeSocket);
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