Top 20 NuGet testing Packages

A simple library for authoring self-describing, or BDD-Style tests
Provides a unit testing API that ensures the API of your service remains backwards compatible.
Some test tools for specific MVVM needs
This library only contains Winforms BuildUi() as it is unsupported in .NET Standard
Provides per-integration test database provisioning and database seeding for projects that utilize Entity Framework Core.
Ninstance creates test instances for your classes without you having to care about the constructor signature, so you can change dependencies without having to fix hundreds of tests, or passing substitutes that don't affect behaviour
My Tested ASP.NET Core MVC view component attribute assertion methods.
A fixture for XUnit that start up a fake local S3 bucket to test your code with. Whilst it was built for XUnit it should be framework agnostic.
Package Description
Shimmy is an easy-to-use mocking framework based on Pose. Like Pose, Shimmy helps you test your code by replacing calls to methods (including static, non-virtual and even private methods) with delegates (shims). However, with Shimmy, you don't have to write these delegates yourself. Instead, simply...
MVC functional tests with a fixture pattern for an Entity Framework Core database
A fixture for XUnit that starts up a Redis cache to test your code with. Whilst it was built for XUnit it should be framework agnostic.
A fixture for XUnit that starts up Kafka and Zookeeper to test your code with. Whilst it was built for XUnit it should be framework agnostic.