Dart嘲笑流

Question

我试图通过模拟套接字来测试使用WebSockets的类

我的班级看起来像

class WebLoggerHandler{

   WebLoggerHandler(){

     var webSocket = new WebSocket('hostUrl');
     webSocket.onOpen.first.then((_) {
       webSocket.sendString('hello');
     });
   }
}

我正在嘲笑WebSocket类，如下所示

class MockWebSocket extends Mock implements WebSocket{        
  Stream<Event> onOpen;
}

我测试的主体看起来像

  var webSocket = new MockWebSocket();

  //fire the onOpen event 
  webSocket.onOpen = new Stream.fromFuture( new Future.value( new Event( "onOpen")));

  WebLoggerHandler underTest = new WebLoggerHandler();

  //test that the hello message was sent when the socket was opened
  webSocket.getLogs( callsTo("sendString", 'hello')).verify( happenedExactly(1))  

但是在检测到webSocket日志发生后，onClose事件发生时它无效。

如何使代码等待Future发生？

由于

Answer 1

阅读API文档并进行了解决。测试需要返回未来

   test("it should send 'hello' to the server", () {

      return new Future.value().then((_) {

        webSocket.getLogs(callsTo("sendString", {'hello'})).verify(happenedExactly(1));

      });

   });