Top 20 NuGet Unit Testing Packages

Augments Microsoft's Visual Studio unit testing framework and helps out with TDD
NJasmine is an NUnit extension for writing given/when/then style specifications or tests. Like RSpec, NJasmine as a DSL uses nested anonymous methods to build up a specification. Reference nuget NJasmine to write your specs, and reference nuget NJasmine.NUnit to run your tests.
NDecision.Aspects provides AOP-driven business logic execution. NDecision is a Fluent decisioning engine written with Behavior Driven Development practices.
An Ninject-based automocker for Moq.
MVC Route Unit Tester provides convenient, easy to use methods that let you unit test the route table in your ASP.NET MVC application, including Area routes. Unlike many libraries, this lets you test routes both ways -- both incoming and outgoing. You can specify an incoming request and make one of ...
An extension to nunit assertions to reflect on lambda expressions passed to an expect method to give better output of what goes wrong on failures, rather than the builtin assertions.
NetBash Commands for abSee A/B Testing library
Deleporter - Simple Cross Process Stubbing. Facilitates stubbing out dependencies when running automated browser tests against ASP.Net. Use in conjunction with your favorite mocking/IOC frameworks. Deleporter will teleport mock objects (or any arbitrary delegates) into a remote ASP.Net application, ...
Adds the current SeleniumServer.jar (27MB) to the project (requires Java to run - http://java.com). Pulls in Selenium.Support. Useful for headless browser testing where you don't want to be bothered with setting up Selenium Server. Note, if you already have a SeleniumServer.jar on your system, you c...
Deleporter - Simple Cross Process Stubbing. Facilitates stubbing out dependencies when running automated browser tests against ASP.Net. Use in conjunction with your favorite mocking/IOC frameworks. Deleporter will teleport mock objects (or any arbitrary delegates) into a remote ASP.Net application, ...
Tests constructors in a given assembly or class for ArgumentNullExceptions.
An ActiveRecord pattern implementation for POCOs using NHibernate with emphasize on testability.
Test fixtures for .NET and MongoDB to make integration testin a little easier.
A library for automatic regressiontesting of applications / Coded UI Tests. This library allows you to write tests for your WPF applications. The library uses MS UI Automation and TestApi to mimic the user interaction.
A lightweight testing DSL for C#, providing Given When Then syntax for unit tests
Phantom.js runner to integrate javascript tests for xUnit
Extensions to SharpTestsEx for ASP.NET MVC
a collection of wp7 helper classes which make it simpler to write tests for wp7
Web application testing framework.