If this is normal mocking...
Repo.GetLastName(Arg.Any<string>()).Returns("Smith");
...why won't this work?
Repo.GetLastName(Arg.Any<string>()).Returns(null);
For some reason NSubstitute, in expecting to return a string in this example, cannot associate a null string with the string type. It's authors seem happy to let us do some of the work ourselves and thus we must undertake a wire-up like so to hack around the inability to use one line of intuitive code.
string nullString = null;
Repo.GetLastName(Arg.Any<string>()).Returns(nullString);
If you need an interface to come back null you have to do it the same way too.
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