Device Agent Reliability — Final QA Report
==========================================
Date: 2026-06-02
Executor: Sisyphus-Junior (F3 Real Manual QA)

SCENARIOS [10/15 PASS | 5 BLOCKED]
=================================

T1: State Machine Core — PASS
  - TestStateMachine_InitialState: PASS
  - TestStateMachine_ValidTransitions (7 sub-tests): ALL PASS
  - TestStateMachine_InvalidTransitions (9 sub-tests): ALL PASS
  - TestStateMachine_String (5 sub-tests): ALL PASS
  - TestStateMachine_OnStateChange: PASS
  - TestStateMachine_ContextCancellation: PASS
  - TestStateMachine_ConcurrentTransitions (100 goroutines): PASS
  - TestStateMachine_OnStateChangeNotPanicWhenNil: PASS

T2: Tunnel Restart Fix — PASS
  - TestUAPIConversion: PASS
  - TestUAPIConversionWithPSK: PASS
  - StopStealthTunnel() exists and is idempotent
  - Graceful restart with 2s cleanup wait implemented
  - Code review: restart logic in StartStealthTunnel correct

T3: Handshake Monitor Fix — PASS
  - TestHeartbeatInterval: PASS
  - TestReconnectBackoff: PASS
  - TestHandshakeTimeout: PASS

T4: CLI Help Menu — BLOCKED
  - Cannot build binary (main.go:174 missing ctx arg)
  - Source review: printHelp() comprehensive (flags, env, examples, JSON fields)

T5: Health Check System — PASS
  - DefaultHealthCheckerConfig() returns correct values
  - NewHealthChecker: creation, failure tracking, ResetFailures, Failures snapshot
  - runCheckLoop: threshold triggers StateRecovering, recovery callback fires
  - Start/Stop lifecycle: context cancellation, WaitGroup cleanup
  - BEHAVIORAL NOTE: onRecover only fires for sub-threshold recovery

T6: Failover Manager — PASS
  - Priority-based server selection: correct
  - Endpoint format: correct
  - RecordFailure: endpoint exhaustion -> next server
  - ResetFailure: clears counts and backoff
  - Empty server list: all ops safe
  - Concurrent access (100 goroutines): no race/panic

T7: Provisioning Timeout — PASS
  - TestProvisionSuccess: encrypted config round-trip works
  - TestInvalidToken: HTTP 404 handled
  - TestRetryOnNetworkError: 3 retries with 5s backoff verified (10s+)

T8: Enhanced Logging — BLOCKED
  - Cannot build binary
  - Source review: JSONMessage struct, jsonLog(), 4 components, RFC3339

T9: Server Heartbeat API — PASS
  - server-core builds cleanly
  - heartbeat.go: accepts StatusReport (status, state, tunnel_up, last_handshake)
  - Validation: device_id UUID parse, last_handshake RFC3339 format

T10: Server Status API — PASS
  - status.go: GetDeviceStatus + ListStatuses
  - Response format consistent across both endpoints

T11: Installation Documentation — PASS
  - Linux: automated install, manual install, Docker
  - Windows: nssm, PowerShell New-Service
  - Android: AAR library, WireGuard app
  - Troubleshooting: 7-row issue table, log locations, debug commands

T12: Configuration Documentation — PASS
  - docs/configuration.md: env vars table, CLI flags table
  - JSON format documented, version info, internal defaults

T13: Windows Support — BLOCKED (BUG)
  - windows.go:31: svc.SpecificCode undefined
  - svc.Handler.Execute requires (bool, uint32), not (svc.SpecificCode, error)

T14: Android Support — BLOCKED
  - gomobile not installed on test machine
  - Code review: AgentController, GetAndroidID fallback chain correct

T15: Cross-Compile Pipeline — BLOCKED (BUG)
  - main.go:174 compilation error blocks all builds
  - Makefile targets verified: 5 linux + 1 windows + 1 android + release

COMPILATION BUGS (2)
====================

BUG 1 — main.go:174 (Critical)
  client.Provision(serverURL, regToken, hwid)
  Expected: client.Provision(ctx, serverURL, regToken, hwid)
  Impact: Blocks binary build, CLI, logging, all cross-compilation

BUG 2 — internal/platform/windows.go:31 (Critical)
  Execute returns (svc.SpecificCode, error)
  svc.Handler requires (svcSpecificEC bool, exitCode uint32)
  Impact: Blocks Windows compilation

CROSS-TASK INTEGRATION [3/4]
============================
  State Machine + Health Checks: PASS
  State Machine + Failover: PASS
  Health Checks + Failover: PASS
  main.go Integration: FAIL (Task 7 broke main.go)

EDGE CASES [8/8 PASS | 1 NOTE]
==============================
  Concurrent state machine (100 goroutines): PASS
  Concurrent failover manager (100 goroutines): PASS
  Context cancellation propagation: PASS
  Invalid transitions silently ignored: PASS
  Full lifecycle: Idle->Connected->Recovering->Connected->Stopped->Idle: PASS
  Empty server list operations: PASS
  Nil callback safety: PASS
  Unknown state String(): PASS
  onRecover post-threshold: NOTE (by design — recovery counter resets)

VERDICT: FAIL
=============
Scenarios [10/15 pass | 5 BLOCKED] | Integration [3/4 | 1 FAIL] | Edge Cases [8/8 | 1 note]