Top 20 NuGet Unit Testing Packages

Fluent Assertions extensions for ASP.NET MVC 5.
A Xunit plugin that allows a test to try again if it fails.
Unit testing framework for Sitecore.
Integration testing framework for developers. TestR allows automating testing of web applications. Adds PowerShell features that are not part of the regular deployment.
Allows creating reliable, flexible and fast VS SDK integration (VSIX) tests that run using any xUnit capable runner, such as Visual Studio built-in Test Explorer or TestDriven.NET.
A library that will help you unit test your Roslyn analyzers. This package contains the default test helpers provided with the Diagnostics + CodeFix solution template but updated for the latest version of Roslyn and with a few enhancements.
Friendly for C1.Win.
Friendly for FarPoint.
DynamicSpecs NUnit integration
Category Trait helper library for xUnit 2 tests (e.g. UnitTestAttribute)
Hassle free deep object comparison assertions for NUnit.
Testing helpers for using FakeItEasy with EntityFramework.
Provides additional assert capabilities for MS Test.
NUnit comparing assertions
Allows access to test case data in TFS from nunit tests, to read parameters and also to update test runs.
A library containing some helpers which helps you in testing WPF code. Commonly Used Types: DispatcherExtensions
Provides build features for creating model data.
Testify is a unit test assertions, test data creation and contract verification framework. It's not dependent on any specific unit testing framework.
Capture serilog log events to xUnit output
A library providing NUnit tests with the i-net PDFC server.