Top 20 NuGet Unit Testing Packages

Pluggable foundation blocks for building distributed apps.
TestKit for writing tests for Akka.NET using xUnit.
NUnit console and Visual Studio runner for .NET Core and .NET 4.5.1+
AssertJ style fluent assertions for .NET testing framework NUnit.
Simple full-featured automocking framework
Add deep object comparison to your NUnit assertions. Simply use Is.DeepEqualTo in place of Is.EqualTo.
An analyzer to find missing tests for tests written with SmartTests.
SmartTests enables you to write Smarter unit tests, wether you use NUnit, Xunit or MSTests. It is best to install SmartTests.Analyzer and SmartTests.Extension so that missing tests will be displayed. They are Smart in the sense that: 1. The Act line of your test is instantly identifiable. ...
TestFountain is a set of addons/extensions for to help with things like data generation.
Behaviour Driven Development UI and API testing framework designed to help developers document thier applications functionality.
AssertJ style fluent assertions for .NET testing framework xUnit.
This xUnit fixture will start up a dockerised application and allow you to run integration tests against it.
Unit test, integration test and functional test helpers. Includes mocked HttpContext, ActionContext, UserManager and SignInManager. Also includes startup extensions to assert that services has been registered and some extension methods to modify security policies (like bypass a policy).
A testing library for creating Expected Objects
SpecsFor.Mvc is a stand-alone acceptance testing framework for ASP.NET MVC. It enables you to write strongly-typed, refactor friendly integration tests using the browser and testing framework of your choice.
Machine.Specifications.Should is a should library for the Context/Specification framework Machine.Specifications
Defines the IO clients and server contexts that other contexts can use to transport information on a service graph.
Implements the base classes for Powershell instrumentation of service graphs and contexts. Existing commands can be ported with this package.
fitSharp is a set of open-source functional testing tools for .NET, inspired by the Framework for Integrated Test
Genesis.TestUtil contains utility helpers for tests.