OAuth device flow tests failing - mock sequences need debugging

[Hozyne-OpenBak]

Problem

OAuth device flow implementation (Issue #3) is complete, but tests are failing due to mock configuration issues.

Current Status

Implementation: ✅ Complete

• Device authorization logic
• Token polling with exponential backoff
• Error handling for all edge cases

Tests: ❌ 3/6 failing

Failing Tests

1. pollForAccessToken returns access token when authorization is granted

   • Symptom: Test times out
   • Cause: axios.post mock stuck in pending state, never progresses to success

2. Error handling for non-retryable errors

   • Symptom: Promise resolves instead of rejecting
   • Cause: invalid_grant error handling logic not terminating correctly

3. pollForAccessToken handles slow_down

   • Symptom: Delay logic not triggering
   • Cause: Mock not simulating slow_down response correctly

Root Cause

axios.post mock sequences not configured to simulate sequential polling flow:

• Expected: pending → pending → success
• Actual: Stuck in pending, never resolves

Additional Issues

• Jest reports open handles (unclosed timers/async code)
• Test framework may need configuration to detect/close handles properly

Next Steps

1. Debug axios.post mock implementation in test file
2. Ensure sequential responses work correctly for all test cases
3. Verify all promises resolve/reject as expected
4. Fix Jest open handles
5. Run npm test to verify 6/6 passing

Files

• Implementation: backend/src/oauth/oauth-client.js
• Tests: backend/src/oauth/oauth-client.test.js

Priority

Medium - Implementation is functional, tests validate correctness but aren't blocking OAuth flow usage.