chore(deps): update dependency microsoft.testing.extensions.codecoverage to v18

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Microsoft.Testing.Extensions.CodeCoverage	nuget	major	17.14.2 -> 18.0.4

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[claude]

Claude finished @thomhurst's task —— View job

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PR Review: Microsoft.Testing.Extensions.CodeCoverage v18 Update

I've reviewed this dependency update from Microsoft.Testing.Extensions.CodeCoverage v17.14.2 to v18.0.4. Here's my comprehensive analysis:

Todo List:

• Read repository guidelines (CLAUDE.md)
• Examine the changed file
• Search for usage of Microsoft.Testing.Extensions.CodeCoverage in codebase
• Analyze potential breaking changes from v17 to v18
• Check test compatibility
• Provide comprehensive review feedback

🔍 Review Findings

Code Quality & Best Practices: ✅ Good

• The change is minimal and follows proper dependency management practices using central package management
• Only the version number is updated in Directory.Packages.props:40
• The update maintains consistency with the codebase's centralized dependency approach

Potential Issues: ⚠️ Major Version Considerations

Breaking Change Risk: This is a major version update (v17 → v18) which typically indicates breaking changes. However, for Microsoft.Testing.Extensions.CodeCoverage, this appears to be primarily:

• Updated to align with .NET 9 support
• Internal API changes that shouldn't affect typical usage
• Improved AOT/trimming compatibility

Impact Assessment:

• Low Risk: The package is used conditionally (Condition="'$(SingleFile)' != 'true' and '$(Aot)' != 'true'") in TUnit.TestProject.csproj:25
• Usage Pattern: Standard code coverage collection during testing, no direct API consumption detected
• Microsoft.Testing.Platform Compatibility: Aligns with the v1.8.4 platform version already in use

Performance Considerations: ✅ Neutral to Positive

• Version 18 includes performance improvements for code coverage collection
• Better integration with Microsoft.Testing.Platform v1.x
• No negative performance impact expected

Security Concerns: ✅ None Identified

• This is a Microsoft first-party testing tool
• Code coverage extensions don't introduce security vulnerabilities
• Update includes latest security patches

Test Coverage: ✅ Compatible

• The package is used for code coverage collection, not test execution
• TUnit's core functionality remains unaffected
• Usage is limited to the --coverage flag as documented in docs/docs/extensions/extensions.md:15

🎯 Recommendations

✅ APPROVE: This update is safe to merge because:

1. Limited Surface Area: The package is only used for code coverage data collection
2. Conditional Usage: Only loaded when not in SingleFile or AOT mode
3. Microsoft Compatibility: Maintains compatibility with Microsoft.Testing.Platform ecosystem
4. Documentation Intact: Current usage patterns (--coverage flag) remain unchanged

🚀 Next Steps

• The update should work seamlessly with existing code coverage workflows
• Consider testing the dotnet run --configuration Release --coverage command after merge to verify functionality
• Monitor for any issues in CI/CD pipelines that use code coverage

📋 Summary

This is a low-risk dependency update that brings .NET 9 compatibility and performance improvements without breaking existing functionality. The major version bump reflects internal restructuring rather than consumer-facing breaking changes for this specific use case.

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