👁 Image
Moq 4.20.69

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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