Moq expectations on the same method twice in a row

Question

I am trying to set up exceptions for a method that is called twice in a row with different parameters. Like this:

  var adapter = new Mock<IKeyAdapter>();
  adapter.Setup(x => x.ImportKey(It.IsAny<Guid>(), key, It.IsAny<string>(), publicTicket)).Returns(Guid.NewGuid());
  adapter.Setup(x => x.ImportKey(It.IsAny<Guid>(), key, It.IsAny<string>(), privateTicket)).Returns(Guid.Empty);

I wan't the first to pass and the second to fail. Currently it seems that the second setup overwrites the first.

Is this possible with Moq?

Answer 1

You are correct that the second expectation is overwriting the first. This appears to be a current limitation. Some workarounds have been devised as follows:

• Moq Sequences which can obtained here at github.
• Overloading IExpect.Returns to take an expression rather than a value as described here, and elaborated on here and here.