Non-static method requires a target

[kentcb]

A verification along the lines of:

mock
    .Verify(x => x.SomeCall(It.Matches(y => y.SomeNullableThing.HasValue)))
    .WasCalledExactlyOnce();

results in an exception:

System.Reflection.TargetException: Non-static method requires a target

A simple workaround in this specific example is to change to:

mock
    .Verify(x => x.SomeCall(It.Matches(y => y.SomeNullableThing != null)))
    .WasCalledExactlyOnce();

NOTE: tested on mono only (Xamarin/iOS).

[kentcb]

This affects mono only. I've added a test to prove it works under MS .NET. Hopefully this will sort itself out as the mono team adopt Microsoft OS code.