- Create centralized TEST_IDS constants to eliminate 200+ magic string occurrences
- Create FIXTURES for common test data to reduce 47+ duplicate definitions
- Add setupTestEnvironment() helper to standardize cleanup patterns (36+ occurrences)
- Export utilities from vitestSetup.ts for easy access
- Add comprehensive README with usage examples
This is Phase 1 (Quick Wins) of the testing infrastructure refactor.
Estimated impact: 30-50% reduction in test boilerplate for new tests.
Related analysis documents: TESTING_ANALYSIS_README.md, ANALYSIS_SUMMARY.txt