Callback of Moq is not called?

问题

In the following code. The Assert.Equal(...) of the Callback() is never called?

var test = "Test";

var command = new MyCommand { V = test };

var mock = new Mock<IRepository>(); // IRepository has the method of Save()
var p = new P(test);
mock.Setup(x => x.Save(p))
    .Callback<P>(x => Assert.Equal(x.Value, test)); // break point on Assert.Equal not hit

var sut = new C(mock.Object);
var result = await sut.M(command);

回答1:

You have:

.Setup(x => x.Save(p))

but are you sure the P used in your SUT is "equal to" just that p? Instead you could do:

.Setup(x => x.Save(It.IsAny<P>()))

and in that case the set-up (and call-back) would apply to any argument.

来源：https://stackoverflow.com/questions/59418160/callback-of-moq-is-not-called