Fake It Easy Philipp Dolder What it is Amazingly simple mocking framework Created by Patrik Hägne https://github.com/FakeItEasy/FakeItEasy http://www.nuget.org/packages/FakeItEasy Concepts Everything is a fake Setups are put on a stack Default behavior Default values for primitive types Fakes for complex types How to use it Install-Package FakeItEasy Interface f = A.Fake<Interface>(); A.CallTo(() => f.GetValue()).Returns(5); A.CallTo(() => f.DoIt()).MustHaveHappened(); Create fakes Interface f = A.Fake<Interface>(); IList<Interface> fakes = A.CollectionOfFake<Interface>(3); Setup (1) f.Property = 5; A.CallTo(() => f.ReadOnly).Returns(8); A.CallTo(() => f.GetValue()).Returns(13); Setup (2) A.CallTo(() => f.GetValue()) .ReturnsNextFromSequence(5, 8, 13, 21); int i = 0; A.CallTo(() => f.GetValue()) .ReturnsLazily(() => i++); Assert (1) A.CallTo(() => f.DoIt()).MustHaveHappened(); A.CallTo(() => f.DoIt()) .MustHaveHappened(Repeated.AtLeast.Once); A.CallTo(() => f.DoIt()).MustNotHaveHappened(); A.CallTo(() => f.DoIt()) .MustHaveHappened(Repeated.Never); Assert (2) A.CallTo(() => f.DoIt()) .MustHaveHappened(Repeated.AtLeast.Twice); A.CallTo(() => f.DoIt()) .MustHaveHappened(Repeated.Exactly.Times(3)); A.CallTo(() => f.DoIt()) .MustHaveHappened(Repeated.NoMoreThan.Once); Argument Matching (1) A.CallTo(() => f.Request(3)) .Returns(5); A.CallTo(() => f.Request(3)) .MustHaveHappened();