feat(phase5-batch5.1): Comprehensive E2E test suite

[arpayidcloud-byte]

Summary

Implement Phase 5.1 - E2E Tests per MASTER_PLAN_PRODUCTION.md

Changes

• Added 16 new E2E tests for Phase 4 Reliability features
• Test Dead Letter Queue (3 tests)
• Test Graceful Shutdown Manager (9 tests)
• Test InFlightTracker (3 tests)
• Test Error Handling + DLQ integration (1 test)
• Fixed existing provider registry test
• Total: 37 E2E tests passing

E2E Test Coverage

Pre-existing Tests (21 tests)

• ✅ Agent workflow tests
• ✅ Error handling tests
• ✅ Tool execution tests
• ✅ Multi-agent tests
• ✅ Validation tests

New Tests (16 tests)

• ✅ Dead Letter Queue (3 tests)

  • DLQ accepts and stores failed messages
  • DLQ lists all messages
  • DLQ can be cleared

• ✅ Graceful Shutdown Manager (9 tests)

  • Shutdown manager initializes correctly
  • Shutdown hooks are executed
  • Multiple shutdown hooks execute sequentially
  • Shutdown continues even if hook fails
  • In-flight operations are tracked
  • Shutdown waits for in-flight operations
  • Shutdown times out if operations take too long
  • Signal handlers can be installed
  • Shutdown manager can be reset

• ✅ InFlightTracker (3 tests)

  • Tracks operation count
  • Waits for all operations with timeout
  • Throws on timeout

• ✅ Integration Tests (1 test)

  • Failed tasks can be sent to DLQ

CI Status

• Typecheck ✅
• Lint ✅ (warnings in test file - pre-existing pattern)
• Build ✅
• E2E Tests ✅ (37/37 passing)
• Coverage ⏳

Files Changed

• tests/e2e/specs/phase4-reliability.test.ts (NEW - 240 lines)
• tests/e2e/specs/validation-day1.test.ts (MODIFIED - fix provider test)

Related

• Phase 4.1: PR feat(phase4-batch4.1): Centralized error handling & DLQ #62 (Error Handling & DLQ) ✅ Merged
• Phase 4.4: PR feat(phase4-batch4.4): Graceful shutdown implementation #63 (Graceful Shutdown) ✅ Merged
• Phase 5.1: This PR (E2E Tests) ⬅️ CURRENT

Next Steps

After merge:

1. Phase 5.2: Load Tests
2. Phase 5.3: Security Tests
3. Phase 6: Monitoring & Observability

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