Top 10 Unit Testing Libraries in 2017

A unit is the smallest testable part of the software. Unit testing is a technique of software testing where individual modules/units are tested. The primary purpose of unit testing is to isolate and validate each unit of the application and fix the bugs.


  • Makes the coding process more Agile.
  • Improves the quality of the code and issues are found at an early stage.
  • Bugs are found early, so it reduces the cost of bug fixes.
  • Improves design and allows better refactoring of code.

There are a lot of unit testing libraries/frameworks available which helps you integrate unit testing into your application.

In this article, we will discuss the top 10 Unit Testing libraries, or you can say the most useful libraries which are used in 20107

01 NUnit By charliepoole

Downloads (Total: 1053m+, Daily: 6,065)

NUnit is a unit-testing framework for all .Net languages. Initially ported from JUnit, the current production release, version 3, has been completely rewritten with many new features and support for a wide range of .NET platforms.

For further details, you can visit

02 xUnit By bradwilson

Downloads (Total: 106m+, Daily: 4,252) is a free, open source, community-focused unit testing tool for the .NET Framework. It is a developer testing framework, built to support Test Driven Development, with a design goal of extreme simplicity and alignment with framework features.

For further details, you can visit

03 FluentAssertions By dennisdoomen

Downloads (Total: 062m+, Daily: 2,475)

A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit test.

Fluent Assertions supports the following unit test frameworks:

  • MSTest (Visual Studio 2010, 2012 Update 2, 2013 and 2015)
  • MSTest2 (Visual Studio 2017)
  • NUnit
  • XUnit
  • XUnit2
  • MBUnit
  • Gallio
  • NSpec
  • MSpec

For further details, you can visit

04 Moq By kzu & clariuslabs

Downloads (Total: 1092m+, Daily: 7,587)

Moq is a third party library/framework that enables you to create the dummy class and its methods’ dummy implementation without actually creating a class with actual method implementation.

For further details, you can visit

05 NSubstitute By davetchepak

Downloads (Total: 035m+, Daily: 1,415)

NSubstitute is a friendly substitute for .NET mocking frameworks. It has a simple, succinct syntax to help developers write clearer tests. NSubstitute is designed for Arrange-Act-Assert (AAA) testing and with Test Driven Development (TDD) in mind.

For further details, you can visit

06 FakeItEasy By tom103 & adamralph

Downloads (Total: 013m+, Daily: 539)

FakeItEasy is a .Net dynamic fake framework for creating all types of fake objects, mocks, stubs, etc.

  • Easier semantics, all fake objects are just that - fakes - the use of the fakes determines whether they're mocks or stubs.
  • Context-aware fluent interface guides the developer.
  • Designed for ease of use.
  • Full compatibility with both C# and VB.Net.

For further details, you can visit

07 Chutzpah By mmanela

Downloads (Total: 870k+, Daily: 380)

Chutzpah is an open source JavaScript test runner which helps you integrate JavaScript unit testing into your website. It enables you to run JavaScript unit tests from the command line and from inside of Visual Studio. It also supports running in the TeamCity continuous integration server.

For further details, you can visit

08 Flurl.Http By tmenier

Downloads (Total: 451k+, Daily: 342)

  • Flurl is a modern, fluent, asynchronous, testable, portable, buzzword-laden URL builder and HTTP client library.
  • With a discoverable API, extensibility at every turn, and a nifty set of testing features, Flurl is intended to make building and calling URLs easy and downright fun.

For further details, you can visit

09 Bogus By bchavez >

Downloads (Total: 281k+, Daily: 306)

A sane and straightforward data generator for populating objects that supports different locales. A delightful port of the famed faker.js and inspired by FluentValidation. Use it to create and load databases and UIs with mock-up data. Get started by using Faker class or a DataSet directly.

For further details, you can visit

10 NUnitLite By charliepoole

Downloads (Total: 416k+, Daily: 196)

NUnitLite provides a simple way to run NUnit tests, without the overhead of a full NUnit installation. It is suitable for projects that want to have a quick way to run tests using a console runner and don't need all the features of the NUnit engine and console runner.