dotnet-enable-testing-platform

name	dotnet-enable-testing-platform
description	Enables the Microsoft Testing Platform runner in global.json. Also use when the user mentions "testing platform," "Microsoft.Testing.Platform," "new test runner," "migrate test runner," "global.json testing," or "modern test platform."
license	MIT
metadata	{"author":"Im5tu","version":"1.0","repositoryUrl":"https://github.com/im5tu/dotnet-skills"}
allowed-tools	Bash(dotnet:*) Read Glob AskUserQuestion

Enable the Microsoft Testing Platform runner for a .NET solution by configuring global.json.

The Microsoft Testing Platform is a modern, extensible test runner that provides improved performance, better diagnostics, and native support for parallel test execution.

Steps

1. Find the solution file (*.sln) in the current directory

   • If no .sln found, warn and stop

2. Check for existing global.json in the solution root directory

   • Read contents if file exists

3. Create or update global.json:

   • If file does not exist, create it:

     {
       "test": {
         "runner": "Microsoft.Testing.Platform"
       }
     }
     

   • If file exists, merge the test section while preserving all other content:
     • Parse existing JSON
     • Add or update the test.runner property
     • Preserve sdk, msbuild-sdks, and any other existing sections

4. Verify JSON validity:

   dotnet build
   dotnet test
   

5. If build fails, report the error and ask user how to proceed

6. Report results:

   • Confirm global.json was created or updated
   • Show the final global.json content
   • Confirm build status
   • Confirm tests run successfully

Example global.json Configurations

Minimal (new file):

{
  "test": {
    "runner": "Microsoft.Testing.Platform"
  }
}

Merged (existing file with SDK pinning):

{
  "sdk": {
    "version": "8.0.100",
    "rollForward": "latestMinor"
  },
  "test": {
    "runner": "Microsoft.Testing.Platform"
  }
}

Error Handling

• If no .sln found: warn and stop
• If global.json exists but is invalid JSON: report error and ask user
• If build fails after update: show errors and ask user how to proceed