Top 20 NuGet test Packages

Lightweight Test Automation Framework (LTAF) for ASP.NET runtime dependencies
Library of helpers for testing
A fork of the QUnit javascript unit test framework that has been redesigned to work exclusively with WinJS bindings in Windows 8.
Fluent API for creating large amounts of test data.
The Underscore Log projects solves the problem to standardizing the way to write javascript code and the way the logs are displayed in all browsers.
Test packaging
Plant is a test factory for .NET 4.0. It is very much like FactoryGirl (http://github.com/thoughtbot/factory_girl/) for Ruby. The goal of this project is to allow you to reduce noise and duplication across your tests when creating models.
Uses PhantomJS to run your mocha/chai/sinon test suite, base package to be used for specific test runners
Jasmine is a behavior-driven development framework for testing JavaScript code. The package contains only jasmine.js which is useful for using together with Chutzpah.
This library contains the DgmlTestModel class which you can use to execute a DGML test model in VS 2013. The execution state is writen to a named pipe so that the DGML Test Monitor VSIX package can animate the progress during test execution.
Conjurer is a clever .NET implementation of the Test Data Builder pattern that helps you set up objects in the arrange part of your tests. Although useful in many situations, Conjurer is particularly good at setting up POCO style entity objects used with Entity Framework, NHibernate and similar pers...
A fluent assertion module for PowerShell. Part of the PSST PowerShell Suite for Testing.
A mocking library for PowerShell, including dyamic mocks, multiple context levels, call tracking. Part of the PSST PowerShell Suite for Testing.
A test runner module for PowerShell, supporting TDD- and BDD-style test cases, NUnit-compatible test results, batch running or ISE F5 testing, and setup/teardown constructs. Part of the PSST PowerShell Suite for Testing.
TestApi is a library of test and utility APIs that enables developers and testers to create testing tools and automated tests for .NET and Win32 applications. TestApi provides a set of common test building blocks -- types, data-structures and algorithms -- in a simple, layered, componentized and doc...
My package description.
Functional testing for ASP.NET MVC web apps
A small framework and runner for .NET performance testing.
Provides the initial skeleton to write specs/tests for client side scripts in ASP.NET MVC Application.