Top 20 NuGet testing Packages

A tiny helper library for creating database integration tests
AssertJ style fluent assertions for the Moq mocking framework.
Simple package for internal logging into the local file
A framework for implementing testable plugins and code activities for Dynamics CRM 365
Easy way to tests queries generated by NHibernate. General concept here: http://blog.approvaltests.com/2009/04/approving-weather.html
Utilities to use at runtime with EntityFramework to enable more tesable code. Use the ApprovalTests.EntityFramework nuget in your tests.
Simple full-featured automocking framework
ULinq is a .NET standard library that converts MVC/WebAPI controller actions into URLs. It is particularly useful for integration testing.
The Schema Generator for the Consumer Schema Tool
The Schema Checker for the Consumer Schema Tool
A number of simple methods to test database objects and execute sql. Currently supports Microsoft SQL Server databases.
Implementation of ITestCaseOrderer to enforcing xUnit to run the facts in strict order
Implementation of ITestCaseOrderer to enforcing xUnit to run the facts in strict order
xUnit Integration testing and testing helpers.
Moq extension methods and syntax helpers used by SparkyTestHelpers.Moq and SparkyTestHelpers.Moq.Fluent
A test runner console template capable of running tests developed with SourceCharm.Testing.
FakeHttpMessageHandler seamlessly fakes http request sent from System.Net.Http.HttpClient for purpose of unit testing code that previously could only be integration tested.