The most popular and friendly mocking library for .NET

var mock = new Mock<ILoveThisLibrary>(); // WOW! No record/replay weirdness?! :) mock.Setup(library => library.DownloadExists("2.0.0.0")) .Returns(true); // Use the Object property on the mock to get a reference to the object // implementing ILoveThisLibrary, and then exercise it by calling // methods on it ILoveThisLibrary lovable = mock.Object; bool download = lovable.DownloadExists("2.0.0.0"); // Verify that the given method was indeed called with the expected value at most once mock.Verify(library => library.DownloadExists("2.0.0.0"), Times.AtMostOnce());

Moq also is the first and only library so far to provide Linq to Mocks, so that the same behavior above can be achieved much more succinctly:

ILoveThisLibrary lovable = Mock.Of<ILoveThisLibrary>(l => l.DownloadExists("2.0.0.0") == true); // Exercise the instance returned by Mock.Of by calling methods on it... bool download = lovable.DownloadExists("2.0.0.0"); // Simply assert the returned state: Assert.True(download); // If you want to go beyond state testing and want to // verify the mock interaction instead... Mock.Get(lovable).Verify(library => library.DownloadExists("2.0.0.0"));

You can think of Linq to Mocks as "from the universe of mocks, give me one whose behavior matches this expression".

Check out the Quickstart for more examples!

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