xUnit.js and its sub-projects are provided as a Visual Studio 2010 solution. Open xUnit.js.sln in Visual Studio, and choose Build > Build Solution.
The build artifacts will be located in the project sub-directories, in the bin/Debug or bin/Release folder, depending on the configuration selected; e.g.: "xUnit.js/xUnit.js.Console/bin/Release/xUnit.js.Console.js".
You can also download the console and gui runners directly from https://xunitjs.codeplex.com.