xunit.core by: jnewkirk, bradwilson

Includes the libraries for writing unit tests with xUnit.net.

xunit.runner.visualstudio by: James Newkirk, Brad Wilson

Visual Studio 2012+ Test Explorer runner for the xUnit.net framework. Capable of running xUnit.net v1.9.2 and v2.0+ tests. Supports .NET 2.0 or later, .NET Core 1.0 or later, and Universal Windows 10.0 or later.