Moq: How to get to a parameter passed to a method of a mocked service

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You can use the Mock.Callback-method:

var mock = new Mock<Handler>();
SomeResponse result = null;
mock.Setup(h => h.AsyncHandle(It.IsAny<SomeResponse>()))
    .Callback<SomeResponse>(r => result = r);

// do your test
new Foo(mock.Object).Bar(22);
Assert.NotNull(result);

If you only want to check something simple on the passed in argument, you also can do it directly:

mock.Setup(h => h.AsyncHandle(It.Is<SomeResponse>(response => response != null)));

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