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Getting started with FakeItEasy is very simple:

  • Open the Package Manager Console:
    Tools → Library Package Manager → Package Manager Console
  • Execute Install-Package FakeItEasy
  • Start faking dependencies in your tests. Here's a sample test class with fakes:
namespace FakeItEasyQuickstart
    using FakeItEasy;
    using NUnit; // any test framework will do

    public class SweetToothTests
        public void BuyTastiestCandy_should_buy_top_selling_candy_from_shop()
            // make some fakes for the test
            var lollipop = A.Fake<ICandy>();
            var shop = A.Fake<ICandyShop>();

            // set up a call to return a value
            A.CallTo(() => shop.GetTopSellingCandy()).Returns(lollipop);

            // use the fake as an actual instance of the faked type
            var developer = new SweetTooth();

            // asserting uses the exact same syntax as when configuring calls—
            // no need to learn another syntax
            A.CallTo(() => shop.BuyCandy(lollipop)).MustHaveHappened();
  • Most FakeItEasy functionality is reached from a common entry point: the A class.
  • In this example the lollipop instance is used as a stub and the shop instance is used as a mock but there's no need to know the difference, just fake it! Easy!
  • Fluent, easy-to-use syntax guides you as you configure fakes.