Top 20 NuGet test Packages

Helper methods to work with Entity Framework 6.* and Moq libraries doing mocks of Entity Framework main methods that access database. To understand how to mock on EF 6, then what this package can do for you, give a look at: http://www.codeproject.com/Tips/1045590/Testing-with-mock-on-Entity-Framew...
My Tested ASP.NET Core MVC core components.
My Tested ASP.NET Core MVC view features components.
Testura.Android is a lightweight test automation framework for Android built in C#. It contains tools and help classes to test, validate and interact with your Android device or emulator.
Gravity API core functionality, which can be hosted as a service on platforms like Console Application, ASP.NET Web API, Service Fabric Service, .NET Core application, WCF Selfhost, etc. FREE register at "http://gravityapi.azurewebsites.net/Account/Register" in order to be able to use Gravity API
A Dynamics CRM 2016/365 mocking framework for plug-ins, custom workflows, and applications.
Mock implementation of IWebDriver which does not open a browser, for high performance testing of Selenium based frameworks, without a dependency on browsers and web drivers.
Akka testing helpers that help you test the relationships between your actors
Specification based testing with xunit
Support for interacting with, and testing, REST services with the TAF test automation framework.
GenFu is a library you can use to generate realistic test data.
WPF extensions for ApprovalTests.
Unit test, integration test and functional test helpers. Includes mocked HttpContext, ActionContext, UserManager and SignInManager. Also includes startup extensions to assert that services has been registered and some extension methods to modify security policies (like bypass a policy).
Behaviour Driven Development UI and API testing framework designed to help developers document thier applications functionality.
Simple test fixture pattern
Enables saving a video of test execution
DotNet port of testcontainers.org
Robust Web UI test automation API with the capability of searching web elements by anchors, i.e. "anchor `First Name` search <input>", "Sign In", "parent `Is this true?` anchor <label> `Yes` search <button/span>", etc., more intuitive and easier than traditonal methods (xpath, css selector, id, name...
Integration of Expecto with DiffPlex
The NUnit project editor allows easy editing of NUnit projects. It supports a form-based interface for editing properties as well as a rudimentary XML editor. This package includes only the editor, which is also available as a part of the NUnit.Runners package.