Question

我需要模拟一个方法以及它作为对象的返回值。下面是我在主类中的代码

//**Main Class**
var message = CorrelationMessageClient.GetCorrelationMessage(
      orderRequest.OrderId, CorrelationMessageType.CorrelationFix);
if (message != null && !string.IsNullOrEmpty(message.CorrelationId))
{
        sendOrderResponse = PrepareExecutionReport(
                 new MessageManager(message.ResponseMessage));
}

CorrelationMessageClient.GetCorrelationMessage的返回类型属于CorrelationMessage对象。

在我的单元测试中，我嘲笑如下

//**Unit Test class** 
private Mock<ICorrelationMessageClient> _mockCorrelationMessageClient;
_mockCorrelationMessageClient = new Mock<ICorrelationMessageClient>();

var correlationResponse = new CorrelationMessage { 
    CorrelationId = "1212121",ResponseMessage = "Response Successful"};

_mockCorrelationMessageClient.Setup(x => 
    x.GetCorrelationMessage(correlationMessageFix.CorrelationId, 
      correlationMessageFix.CorrelationMessageType))
      .Returns(correlationResponse);

当我调试Main Class代码时，我看到传递给GetCorrelationMessage方法的值但消息变量仍然为null。当我在下面的设置方法中编写一个Return语句时，为什么它为null

_mockCorrelationMessageClient.Setup(x =>
   x.GetCorrelationMessage(correlationMessageFix.CorrelationId, 
        correlationMessageFix.CorrelationMessageType))
       .Returns(correlationResponse);

Answer 1

看起来你正在使用Moq。在这种情况下，方法＆＃39;实际调用的参数需要匹配您在.Setup方法中使用的一次，或者您可以允许任何/特定匹配函数。即It.IsAny<T>允许特定参数的所有值：

_mockCorrelationMessageClient.Setup(x =>
   x.GetCorrelationMessage(It.IsAny<TypOfId>(), It.IsAny<TypeOfMessageType>()))
   .Returns(correlationResponse);

否则，您将获得方法的默认实现，该方法将返回结果类型的默认值（引用类型为null）。

请注意，您应该It.IsAny - What is the difference between passing It.IsAny<int>() and the value of It.IsAny<int>() to a method setup内联.Setup。

模拟+问题捕获c＃中方法的返回值

1 个答案: