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● Test Coverage Review Complete

I've completed a comprehensive review of the test coverage for the decay chain visualization feature (PR #67). Here's the summary:

📊 Current Status: INSUFFICIENT TEST COVERAGE

Findings:

✅ Existing Coverage (Pre-PR):

  • Basic decay data display, badges, and navigation
  • Decay table toggle functionality
  • Mobile responsiveness
  • Half-life unit display

❌ Missing Coverage (New in PR #67):

  • Zero tests for DecayChainDiagram.tsx component
  • Zero tests for zoom/pan controls
  • Zero tests for mutually exclusive row expansion
  • Zero tests for table height auto-adjustment
  • Zero tests for Integrated tab decay chain section

📝 Report Generated

I've created TEST_COVERAGE_REPORT.md with:

  1. Detailed gap analysis - What's tested vs. what's missing
  2. Complete test suite - 7 test groups with ~25 test cases
  3. Ready-to-use code - Copy-paste Playwright tests
  4. Test data recommendations - Specific nuclides to use (U-238, Th-232, C-14, etc.)
  5. Execution plan - Prioritized in 3 phases

🎯 Recommended Action

Before merging to production, implement Phase 1 Critical Tests (~3-4 hours):

  1. DecayChainDiagram rendering for U-238
  2. Zoom controls functionality
  3. Mutually exclusive row expansion
  4. Table height auto-adjustment
  5. Integrated tab decay chain section

All test code is provided in the report - you can copy it directly into a new file e2e/tests/decay-chain.spec.ts.

📁 Files to Review

  • TEST_COVERAGE_REPORT.md - Complete analysis and test suite
  • Current E2E tests: e2e/tests/element-data.spec.ts (for reference patterns)

Would you like me to:

  1. Create the new test file with Phase 1 critical tests?
  2. Run the existing E2E suite to establish a baseline?
  3. Both?