FakeItEasy 

It's faking amazing! The easy mocking library for .NET that works great in C# and VB.NET alike. No need to know the difference between a stub, a mock or a spy, everything's a fake! The easy to use, refactoring friendly API makes faking a breeze.

Provides diagnostic analyzers to warn about incorrect usage of FakeItEasy in C#. Works in Visual Studio 2015 Update 1 or later.

DO NOT INSTALL THIS PACKAGE. It's no longer maintained and does nothing. Use one of the language-specific analyzer packages instead: FakeItEasy.Analyzer.CSharp or FakeItEasy.Analyzer.VisualBasic.

Provides diagnostic analyzers to warn about incorrect usage of FakeItEasy in VB.NET. Works in Visual Studio 2015 Update 1 or later.

Provides extension methods for configuring methods that return ValueTask or ValueTask<T>.