Top 20 NuGet testing Packages

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This package includes the nunit.engine.api, which is normally the only assembly referenced by runners as well as by engine extensions. It is not intended for direct use by users who simply want to run tests using NUnit.
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Automatic test subject mocking using Moq.
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An extensible Dnamics 365 testing SDK and collection of tools
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A lightweight unconstrained isolation framework for .NET Standard
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Helpers for writing tests that use Microsoft.Extensions.Logging. Contains test implementations that are observable.
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Library that provides methods that will help you with mocking Entity Framework Core.
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TestStack.White.ScreenObjects adds support for the Page Object Pattern, allowing you to write clean maintainable UI Tests
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This package is only a redirect to the System.Waf.UnitTesting.Wpf package. System.Waf.UnitTesting.Wpf is the successor of this package.
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A library containing some helpers which greatly simplify the code needed for assertions.
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Selenium driver implementation for the Alias framework.
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Update of the original NDbUnit Core for .Net Standard 2.0
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Foq

Foq is a lightweight thread-safe mocking library for F#, C#, and VB with a similar API to Moq.
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Adds pairwise and combinatorial testing to Xunit. When combined with Xunit's [Theory] attribute, generates test cases that run a test under many conditions that you control via test method parameters.
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A simple library used for simulating http context during unit or integration testing
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Unit testing framework for Sitecore.
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An xUnit style framework for TypeScript with auto-discovery, async tests, and assertions.
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Generators include: random numbers, currency amounts, coin toss, LUHN passing credit card/account number/sort codes, e-mail, URL, male/female names, lists, IP address, UK mobile and landline phone numbers, UK National Insurance (NI) numbers, relative date/times, and many more.
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Provides assembly-level shared state via IAssemblyFixture<TFixture>, just like built-in class fixture state.
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NBench is a cross-platform automated performance profiling and testing framework for.NET applications.
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My Tested ASP.NET Core MVC view features components.