获取异常system.reflection.targetinvocationexception异常已被调用目标抛出

Question

 public void Post_To_Set_Location_Header_Build()
    {
        // This version uses a mock UrlHelper.
        var mockRepository = new Mock<SEFDataServiceRequestManager>();

        var controller = new BuildController(mockRepository.Object);

        BuildStatusResult buildStatus=null ;
        controller.Request = new HttpRequestMessage() { Properties = { { HttpPropertyKeys.HttpConfigurationKey, new HttpConfiguration() } } }; 
        // Act

        HttpResponseMessage actionResult = controller.Post(buildStatus);
        Assert.IsNotNull(actionResult);
        Assert.AreEqual(HttpStatusCode.Conflict, actionResult.StatusCode);



    }

  

我在webAPI的cs文件中有一些单元测试用例，当我运行tescases时，它显示如下的异常

     

system.reflection.targetinvocationexception异常已被调用目标抛出 - ＆gt; System.NullReferenceException：对象引用未设置为对象的实例