Migrate test project from VSTest to Microsoft Testing Platform

[hahn-kev-bot]

Switch to the fancy new MTP test runner, instead of vs test.

AI Summary

Switch SIL.Harmony.Tests to run on Microsoft.Testing.Platform (MTP) instead of VSTest, following the .NET VSTest-to-MTP migration guidance.

• Enable the MTP runner for the xUnit.net v3 test project (UseMicrosoftTestingPlatformRunner + OutputType=Exe).
• Use the xunit.v3.mtp-v2 package so the GitHubActionsTestLogger MTP extension (which requires MTP v2) can report results in CI.
• Add global.json with test.runner=Microsoft.Testing.Platform so dotnet test uses MTP on the .NET 10 SDK.
• Remove VSTest-only packages: Microsoft.NET.Test.Sdk, xunit.runner.visualstudio, coverlet.collector, and the explicit Microsoft.Testing.Platform reference (now transitive).
• Update CI workflows to replace the VSTest --logger GitHubActions with the MTP --report-github flag.

Claude-Session: https://claude.ai/code/session_01PKdgdJdeDQrwFE5pruMH3n

Summary by CodeRabbit

• Tests
  • Updated automated test execution to use Microsoft Testing Platform and xUnit v3.
  • Improved GitHub Actions test reporting with the updated test reporting integration.
  • Simplified test project configuration and refreshed test tooling dependencies.
• Chores
  • Added repository-level configuration for the standardized test runner.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 72422d70-e201-42a2-afcd-c1c9a96dc906

📥 Commits

Reviewing files that changed from the base of the PR and between d243104 and d08ab9e.

📒 Files selected for processing (1)

• Directory.Packages.props

📝 Walkthrough

Walkthrough

The test projects now use Microsoft Testing Platform with the xUnit v3 MTP runner. Central test dependencies were updated, and both CI workflows now use --report-github for test reporting.

Changes

Test platform migration

Layer / File(s)	Summary
Test runner configuration global.json, Directory.Packages.props, src/SIL.Harmony.Tests/SIL.Harmony.Tests.csproj	The repository and test project now use Microsoft Testing Platform with the xUnit v3 MTP runner. Legacy test SDK, runner, adapter, coverage, and platform references were removed.
CI test reporting .github/workflows/test.yaml, .github/workflows/nuget-ci-cd.yml	The test commands now use --report-github instead of the GitHubActions logger option.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: hahn-kev, rmunn

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: migrating the test project from VSTest to Microsoft Testing Platform.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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