Arg.Any<Nullable<T>> and Arg.Any<T?> throws a null argument exception

[Imaji]

I'm trying to mock out a call that takes in nullable GUIDs, unfortunately when I try arranging the call:

Mock.Arrange(() => myStubInstance.DoSomthing(Arg.Any<Nullable<GUID>>()) or

Mock.Arrange(() => myStubInstance.DoSomthing(Arg.Any<GUID?>())

I get a null reference exception being thrown.  I then tried change the Arrange to use just GUID as the Arg type which works, but when the call is made in the code under test with a null value, the null reference is thrown again.

How can I get around this?

Ta,

J

[Ricky]

Hi John,

Unfortunately, the issue is more internal of how the argument is matched for nullable types. But i fixed it and it will be shipping with next build.

With the new build you will be able to do it like [as expected]:

[TestMethod]
public void ShouldMatchNullableArgument()
{
    var foo = Mock.Create<Foo>();
    Mock.Arrange(() => foo.Echo(Arg.IsAny<int?>())).Returns(10);
    int ret = foo.Echo(4);
    Assert.Equal(10, ret);
}

 
Thanks a lot for reporting it :-)

Regards,
Mehfuz.

[Imaji]

Rocking, thanks Mehfuz :)