dotnet-enable-testing-platform

在global.json中启用Microsoft测试平台运行器。当用户提到“测试平台”、“Microsoft.Testing.Platform”、“新测试运行器”、“迁移测试运行器”、“global.json测试”或“现代测试平台”时也使用。

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

The Microsoft Testing Platform is a test runner with an in-process host and native parallel test execution.

Steps

Find the solution file (*.sln) in the current directory
- If no .sln found, warn and stop
Check for existing global.json in the solution root directory
- Read contents if file exists
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
Verify JSON validity:
```
dotnet build
dotnet test
```
If build fails, report the error and ask user how to proceed
Report results:
- Confirm global.json was created or updated
- Show the final global.json content
- Confirm build status
- Confirm tests run successfully

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"
  }
}