NUnit - A framework, based on the JUnit family, for building application unit tests. It assists with test-driven design, a technique of Extreme Programming. CsUnit - C# based unit testing framework for the .NET framework. Includes download, samples, tutorials and FAQ. [Open source, zlib/libpng license] NCover - Code coverage tool. Includes download, samples, tutorials and FAQ. [Commercial, trial version] xUnit.net - Unit testing framework for .NET. Contains description, tutorials and FAQ. [Open source] Pex - A tool that performs a systematic program analysis and automatically generates test suites with high code coverage. [Proprietary] Moles (Microsoft Fakes) - An isolation framework for .NET which allows to replace any .NET method, including non-virtual/static methods in sealed types, with a delegate. [Proprietary] Typemock Isolator - An isolation tool which can change behavior of static methods, sealed classes, and private methods. [Commercial, trial] SpecFlow - An acceptance test driven development and behavior driven development for .NET. [BSD license] Telerik JustMock - A complete mocking tool that allows mocking of non-virtual methods, non-public members, sealed classes and static methods and classes. It can be used with any .NET unit testing framework, it includes examples and documentation. [Commercial, trial version] Testing @ SharpToolbox - List of .NET tools, components, and libraries for testing. NSubstitute - A mocking library designed for Arrange-Act-Assert. Has the succinct syntax with less noise and fewer lambdas. [Open source] OpenCover - Code coverage tool. Source code and installation instructions are provided. [GPL] WCF Load Test - Site of tool that takes a WCF trace file and a WCF client proxy, or a WCF interface contract, and generates a C# unit test that replays the same sequence of calls found in the trace file. The unit test can then be used to load-test the target. [Open source] Fit Sharp - Site for set of open-source functional testing tools, inspired by the Framework for Integrated Test (Fit). Prig - An isolation framework for .NET which allows to replace any .NET method, including non-virtual/static methods in sealed types, with a delegate. [Open Source] UnitWrappers - Unit testable interface based class wrappers for .NET [Open source] Silverlight Unit Test Framework (part of Silverlight Toolkit 5) - A simple, extensible unit testing solution for Silverlight applications, controls and class libraries. [Open source] StatLight - A tool for automating the setup, execution, and gathering results of Silverlight unit tests. [Open Source] NMock - A dynamic mock object library for making easier to test single components without relying on real implementations of all of the other components. Contains downloads, tutorials, documentation. [Open Source] Rhino.Mocks - A dynamic mock object framework with purpose to ease testing by allowing the developer to create mock implementations of custom objects and verify the interactions using unit testing. Contains documentation and downloads.[BSD license] NBehave - Behaviour-driven development tool. Contains downloads and links to related topics. [Open Source] unquote - F# unit test assertion library using quoted expressions to get step-by-step failure messages. Contains source code and documentation.. FsCheck - Site with open source library and related documentation for random testing moq - Simple mocking library for .NET and Silverlight with deep C# 3.0 integration. [New BSD License] The Gallio Automation Platform with MbUnit testing framework - An open, extensible, and neutral system for .NET that provides a common object model, runtime services and tools that may be leveraged by other test frameworks. Provides extensible unit testing framework. Includes downloads, samples, tutorials and FAQ [Open Source] List of Testing Tools and Frameworks - Community maintained list of automated testing tools and frameworks. Microsoft Visual Studio Team Services Test - MS Visual Studio-based support for unit, automation and performance tests as well as measuring coverage [Commercial, trial version] Xamarin Test Cloud - Web site devoted to ecosystem and tooling for automatic mobile application testing on mobile devices. FsUnit - Site of set of libraries for automated testing which makes unit-testing with F# more productive. adds a special syntax to popular .NET testing frameworks. [Opensource] F# web automation and testing framework - Web site of open source web automation and testing framework with goals to make UI testing simple, eliminate brittle and quirky UI tests using solid stabilization layer built on top of Selenium, easy to learn with no prior knowledge. Clean, concise API.