Moq 4.20.70
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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