当setup具有回调时，Moq会抛出NullReferenceException异常

Question

我有一个单元测试。当我定义回调函数来设置我的接口函数并调用调用时，调用Moq抛出NullReferenceException异常，我真的很困惑。

更新：我忘了提到重要的部分。当我逐个运行测试时，一切正常，但是当我运行所有测试时，此测试失败。

例外：

System.NullReferenceException : Object reference not set to an instance of an object.
   at Moq.MethodCall.Matches(ICallContext call)
   at System.Linq.Enumerable.WhereListIterator`1.MoveNext()
   at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
   at Moq.Mock.VerifyCalls(Interceptor targetInterceptor, MethodCall expected, Expression expression, Times times)
   at Moq.Mock.Verify[T](Mock mock, Expression`1 expression, Times times, String failMessage)
   at Moq.Mock`1.Verify(Expression`1 expression, Times times)
   at LimitTest.LimitEditor.LimitEditorTest.EditActionSetExistingLimit(Boolean add) in

单元测试：

var io= new Mock<ILimitServiceIO>(MockBehavior.Strict);
var LimitServiceIO= new MemoryLimitServiceIO();

... different setups...

io.Setup(x => x.PersistActionSet(It.Is<string>(id=>id==companyId), It.IsAny<IList<CsiNotificationActionSet>>()))
                .Callback((string compid, IList<CsiNotificationActionSet> sets) =>LimitServiceIO.PersistActionSet(compid, sets));

... Do some actions...

//This line throws exception
mockIo.Verify(x => x.PersistActionSet(measure.CompanyId,
            It.IsAny<IList<CsiNotificationActionSet>>()), Times.Once());

Assert.AreEqual(2,LimitServiceIO.ActionSets.First(acs => acs.Id == ACTION_SET_A1).Actions.Count,
                "Number of Actions does not match");

PersistActionSet方法的签名是：

void PersistActionSet(string companyId, IList<CsiNotificationActionSet> actionSets)

任何想法为什么发生或指针非常感激。

Answer 1

后人和其他人突然遇到奇怪的错误。在测试中设置STAThread属性解决了问题