To test .NET applications with Slim, you'll need to add the .NET Slim server provided by fitSharp. Here's how to do that:

• Go to the github download page and click on the "release.x.x.zip" file. Save this file in your favorite download spot and then unzip it into a program folder, e.g., c:\Program Files\fitSharp.

• Add the following to the root page of your Slim tests. This could be the root of your FitNesse wiki (e.g., localhost:8080/root) if you're only doing Slim tests, or on the Slim test page or suite page if you have a mix of Slim and Fit tests in your wiki.

!define TEST_SYSTEM {slim}
!path c:\myfolder\mytest.dll
!define COMMAND_PATTERN {%m -r fitSharp.Slim.Service.Runner,c:\program files\fitsharp\fitsharp.dll %p}
!define TEST_RUNNER {c:\program files\fitsharp\Runner.exe}

• Make sure your FitNesse root (e.g., localhost:8080/root) doesn't contain Java paths. If you find the following, remove them.

!path classes
!path fitnesse.jar
!path fitlibrary.jar

• Write your Slim test tables and test fixtures as described on the FitNesse Slim pages.

• To run Slim tests from the command line, you can use the FitNesse Java TestRunner. This works with all types of Slim tests, including .NET.