Top 20 NuGet testing Packages

Helper functions for opening test data files. Handles tests running under Live Unit Testing.
Reposify EF Core implementation.
Auto Health Check integration for Raygun.
Easy to use, small, SignalR Core unit testing support with xUnit and Moq. Check my github for NUnit or MSTest version.
This library contains some test helpers which we regularly use in our test projects.
This .NET Core library provides wrapper interfaces for the classes HttpContext, HttpRequest and HttpResponse.
Mocklis is a library and source code generator for .net, targeted at generating test doubles from interfaces. This is a meta-package referencing both the library and the code generator.
Simple and fluent web automation - Make it so easy to write a range of tests from functional, smoke to acceptance tests for your web application that there's no excuse not to.
XUnit extensions to aid testing ASP.Net Core-specific properties / attributes etc.
Traced Test Extension (TTE) is an extension to major testing frameworks. It extends their capabilities to record and assert the events provided by Event Tracing for Windows (ETW).
Traced Test Extension (TTE) is an extension to major testing frameworks. It extends their capabilities to record and assert the events provided by Event Tracing for Windows (ETW).
AssertJ style fluent assertions for .NET unit testing frameworks.
Extensions for the Selenium IWebElement. Integrates properties and methods that are always needed.
Base Class for Selenium Page Objects for the POM and APOM principles.
Some helpers classes for the SxS Framework