Top 20 NuGet unit-testing Packages

FluentArrange using NSubstitute as mocking framework.
.NET Core global tool continuous test runner that monitors and runs only the tests affected.
Parse jQuery QUnit JavaScript tests from .NET; you can consequently present the tests and their results in your favourite test library (e.g. NUnit).
Utility classes and extensions to facilitate common testing operations.
Experiment.Idioms is to facilitate running idiomatic, regular unit-tests.
Experiment is a base library to support parameterized tests with auto data.
Tools to help write tests for Microdot services.
Tools to help write tests for Microdot services. The project contains logic for Orleans host testers.
This package contains experimental support for configuring parts of the test engine by using ${xmlunit.KEYWORD} sequences inside the control document.
Changelog: 2.5 Updated for Microsoft.Azure.DurableTask.Core 2.9.0 and Microsoft.Azure.WebJobs.Extensions.DurableTask 2.7.0 2.4 Added WaitForCustomStatus(predicate). Updated for DurableTask.Core 2.6.0 2.3 Added WaitForOrchestrationToReachStatus(status[]) and WaitForOrchestrationToFi...
A small .NET Standard library for writing well-structured, clear-cut 3A tests.
Write clean Arrange code using Fluent syntax.
Unit testing framework for Sitecore.
A library that will help you unit test your Roslyn analyzers. This package contains the default test helpers provided with the Diagnostics + CodeFix solution template but updated for the latest version of Roslyn and with a few enhancements.
A simple TCP/UDP server for using in test projects which test .net core based projects.
A set of simple assert extensions to give you more choices and easier to read tests
A sample project to get you up and running with NQUnit using NUnit quickly.
Tools to help write tests for Microdot services. The project contains logic for both Orleans and Non-Orleans host testers.
ExcelDna.Registration.Abstractions is a library that abstracts ExcelDna.Registration classes such as `ExcelRegistration`, `ExcelFunctionRegistration`, and others so you can easily mock them and write unit tests against your Excel add-ins built with Excel-DNA.
ExcelDna.IntelliSense.Abstractions is a library that abstracts ExcelDna.IntelliSense classes such as `IntelliSenseServer`, so you can easily mock them and write unit tests against your Excel add-ins built with Excel-DNA.