Setup Test Coverage Reporting with Codecov Test Results Action

[Copilot]

This PR implements test coverage reporting using Codecov's test results action to enable failed test reporting in PR comments and the Codecov dashboard.

Changes Made

CI Workflow Updates

• Modified the CI workflow to generate JUnit XML test reports using vitest --reporter=junit --outputFile=test-report.junit.xml
• Added dual reporters (--reporter=verbose --reporter=junit) to maintain console output while generating XML
• Integrated codecov/test-results-action@v1 to upload test results to Codecov with proper error handling

Configuration

• Added test-report.junit.xml to .gitignore to prevent committing test reports
• Updated test artifact uploads to include JUnit XML files for debugging and historical records
• Configured upload step with if: ${{ !cancelled() }} to ensure test results are uploaded even when tests fail

Verification

The implementation has been thoroughly tested with both passing and failing test scenarios:

<!-- Example of captured failure in JUnit XML -->
<testcase classname="temp-failing-test.test.ts" name="should fail to test JUnit XML format">
    <failure message="expected true to be false" type="AssertionError">
        AssertionError: expected true to be false
        ❯ temp-failing-test.test.ts:5:18
    </failure>
</testcase>

Benefits

• Enhanced PR Feedback: Failed tests will now appear in PR comments with detailed error information
• Test Analytics Dashboard: Codecov will provide insights into test trends and failure patterns
• Improved Debugging: JUnit XML artifacts provide structured test data for analysis
• Zero Breaking Changes: All existing functionality remains intact with 213 tests continuing to pass

The repository already had comprehensive test coverage reporting via codecov/codecov-action@v5 for code coverage. This PR adds the complementary test results reporting for better visibility into test failures and trends.

Fixes #20.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@2756f0e). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage        ?   64.50%           
=======================================
  Files           ?       49           
  Lines           ?     3381           
  Branches        ?      319           
=======================================
  Hits            ?     2181           
  Misses          ?     1178           
  Partials        ?       22           

Flag	Coverage Δ
unittests	64.50% <ø> (?)

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[github-actions]

PR Quality Report 📊

Check	Status
TypeScript	✅
ESLint	✅
Tests	✅
Build	✅

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