执行Windows Phone单元测试时出现异常

Question

当我运行Windows Phone的单元测试时出现此错误。 我使用Windows Phone 8和Visual Studio2012。我不确定该如何处理：

An exception occurred while invoking executor 'executor://mswptestadapter/v1': Object reference not set to an instance of an object.
========== Run test finished: 0 run (0:00:11.7426216) ==========

Answer 1

我缺少.Net和VS2012扩展的代码合同：

.Net的代码合同-http: //www.google.com/url? q =http% 3A%2F%2Fvisualstudiogallery.msdn.microsoft.com%2F1ec7db13-3363-46c9-851f-1ce455f66970%3FSRC%3DVSIDE&sa = D&sntz = 1＆usg = AFQjCNGLZoTI_GSQJfSfJP5JuSNvv8SlOw

代码合同编辑器扩展VS2012- http://www.google.com/url? q =http% 3A%2F%2Fvisualstudiogallery.msdn.microsoft.com%2F02de7066-b6ca-42b3-8b3c-2562c7fa024f%3FSRC%3DVSIDE&sa = D&sntz = 1＆usg = AFQjCNEHZ2ObOxX0KF5PK7DAme9C1zh6Kg