Top 20 NuGet Unit Testing Packages

Extensions to make automated specifications with a BDD flavor for some .NET testing frameworks
An extension to the LightInject service container that enables dependency injection in xUnit test methods.
Base assembly for PageObjectModels for xUnit based projects
xUnit helpers
Fluent Unit Test framework that allows you to define test methods as fluent lamda expressions instead of plain methods.
Some extended Xunit based functionalities
A bridge package allowing smooth transition from LightBDD.XUnit to LightBDD.XUnit2. After update to this version, the LightBDD.XUnit package can be removed and LightBDD.XUnit2 should be used since then.
The Maxfire Webstack TestCommons Library contains a bunch of xUnit.net Extensions.
The Maxfire Webstack ASP.NET MVC TestCommons Library contains a bunch of xUnit.net/RhinoMocks based Extensions.
Testing helpers using Moq
Test helpers for Mendham.Events
Test helpers for Mendham.Domain using Moq
Test helpers for Mendham.Domain
Testing helpers with builder and ability to populate values directly in xUnit tests
Components to write tests against AspNetCore using Moq
Fixtures for writing tests using AspNetCore TestHost
Testing helpers
xUnit, AutoFixture and NSubstitute stack for declarative style testing.
xUnit, AutoFixture and AutoMoq stack for declarative style testing.
Utility for snapshot testing.