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Implements end-to-end testing infrastructure for the Pulse update flow, validating the entire path from UI to backend with controllable test scenarios. ## What's Included ### Test Infrastructure - Mock GitHub release server (Go) with controllable failure modes - Docker Compose test environment (isolated services) - Playwright test framework with TypeScript - 60+ test cases across 6 test suites - Helper library with 20+ reusable test utilities ### Test Scenarios 1. Happy Path (8 tests) - Valid checksums, successful update flow - Modal appears exactly once - Complete end-to-end validation 2. Bad Checksums (8 tests) - Server rejects invalid checksums - Error shown ONCE (not twice) - fixes v4.28.0 issue type - User-friendly error messages 3. Rate Limiting (9 tests) - Multiple rapid requests throttled gracefully - Proper rate limit headers - Clear error messages 4. Network Failure (10 tests) - Exponential backoff retry logic - Timeout handling - Graceful degradation 5. Stale Release (10 tests) - Backend refuses flagged releases - Informative error messages - Proper rejection logging 6. Frontend Validation (15 tests) - UpdateProgressModal appears exactly once - No duplicate modals on error - User-friendly error messages - Proper accessibility attributes ### CI/CD Integration - GitHub Actions workflow (.github/workflows/test-updates.yml) - Runs on PRs touching update-related code - Separate test runs for each scenario - Regression test to verify v4.28.0 issue prevention - Automatic artifact uploads ### Documentation - README.md: Architecture and overview - QUICK_START.md: Getting started guide - IMPLEMENTATION_SUMMARY.md: Complete implementation details - Helper scripts for setup and test execution ## Success Criteria Met ✅ Tests run in CI on every PR touching update code ✅ All scenarios pass reliably ✅ Tests catch v4.28.0 checksum issue type automatically ✅ Frontend UX regressions are blocked ## Usage ```bash cd tests/integration ./scripts/setup.sh # One-time setup npm test # Run all tests ``` See QUICK_START.md for detailed instructions. Addresses requirements from issue for comprehensive update flow testing with specific focus on preventing duplicate error modals and ensuring checksum validation works correctly.