How to set up a method twice for different parameters with Moq

Question

I would like to set up a method with Moq twice but it seems that the last one overrides the previous ones. Here\'s my initial setup:

string username = \"foo\";
s         


        

Answer 1

Moq supports this out of box with argument constraints:

mock.Setup(ms => ms.ValidateUser(
        It.Is(u => u == username), It.Is(p => p == password))
    .Returns(new ValidUserContext { Principal = principal });
mock.Setup(ms => ms.ValidateUser(
        It.Is(u => u != username), It.Is(p => p != password))
    .Returns(new ValidUserContext());

Catch-all It.IsAny also works, but the order is important:

// general constraint first so that it doesn't overwrite more specific ones
mock.Setup(ms => ms.ValidateUser(
        It.IsAny(), It.IsAny())
    .Returns(new ValidUserContext());
mock.Setup(ms => ms.ValidateUser(
        It.Is(u => u == username), It.Is(p => p == password))
    .Returns(new ValidUserContext { Principal = principal });