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# .NET Mocking Frameworks, a comparison
### What is a Mocking Framework?
Mocking framework is used to create replacement objects like Fakes, Stubs and Mocks. It is used to isolate each dependency and help developers in performing unit testing in a concise, quick and reliable way.
Creating mock objects manually is difficult and time consuming so to increase your productivity you can go for automatic generating of mock objects by using a mocking framework. A developer can build his/her unit test by using any of one NUnit, MbUnit, MSTest, xUnit etc. unit test framework and can further test it on a mocking framework.
### Here Comes Our List of Top 3 Mocking Frameworks for .Net Developers:
**1) NSubstitute**
NSubstitute is a free and open source mocking framework. NSubstitute creates friendly substitute for .Net mocking libraries. It is designed for Arrange-Act-Assert (AAA) testing.\
**Source Code:** \
**Testing Type:** Arrange-Act-Assert (AAA)
**2) Moq**
This is a popular mocking framework for .Net. This mocking framework proves to be highly helpful when you are developing a Silverlight application. Moq is a simplest mocking library for .NET with a nice and simple API. It is a free and open source mocking framework.\
**Source Code:** \
**Mock type:** Supports mocking interfaces as well as classes.
**3) FakeItEasy**
FakeItEasy is an amazing and simple to use framework and is compatible with both C# and VB.Net. It provides nice options for fake and dummy creation and argument formatting. Also, it provides friendly API support.\
**Source Code:**