What is the difference between passing It.IsAny() and the value of It.IsAny() to a method setup

Question

I\'m using Moq and want to create builder classes to create my mocks with preset reasonable defaults that can be overridden during test setup as needed. The approach I took

Answer 1

It.IsAny() has return type of int and returns 0, so your second setup is equivalent to:

mock.Setup(x => x.Bar2(0)).Returns(true);

I didn't check the moq code, but I'm pretty sure that when it evaluates the expression in the setup method, it takes into account that the parameter is actually It.IsAny vs. a normal number.

You are better off if you create the setups directly in your helper methods, and not pass It.IsAny.