Testing: Add tests for Kestra integration and webhooks

[coderabbitai]

Description

The recent Kestra integration (PR #37) has zero test coverage. Critical functionality is untested.

Untested Components

1. Kestra Client (kestra_client.py)

   • Flow triggering
   • Status checking
   • Error handling

2. Webhook Endpoints (webhooks.py)

   • Task update handling
   • Execution update handling
   • WebSocket broadcasting

3. WebSocket Manager (websocket_manager.py)

   • Connection management
   • Broadcast functionality
   • State tracking

Required Tests

Unit Tests

# backend/tests/test_kestra_client.py
async def test_trigger_flow_success()
async def test_trigger_flow_offline()
async def test_get_execution_status()

# backend/tests/test_webhooks.py
async def test_task_update_webhook()
async def test_execution_update_webhook()
async def test_webhook_broadcasts_to_websocket()

# backend/tests/test_websocket_manager.py
async def test_connection_lifecycle()
async def test_broadcast_to_multiple_clients()
async def test_execution_status_tracking()

Integration Tests

• Test full flow: trigger → webhook → WebSocket broadcast
• Test Kestra offline scenario
• Test concurrent WebSocket connections
• Test webhook signature verification (after Issue SEVERE: Debug Code and Sensitive Data Logging in Production #32)

Acceptance Criteria

• Unit tests for KestraClient (>80% coverage)
• Unit tests for webhook endpoints
• Unit tests for ConnectionManager
• Integration test for end-to-end flow
• Mock Kestra API responses
• Test error scenarios (timeouts, invalid data)

Location

• Create: backend/tests/test_kestra_client.py
• Create: backend/tests/test_webhooks.py
• Create: backend/tests/test_websocket_manager.py
• Related Code: PR Kestra end to end integration with the frontend and backend #37

Related Issues

• Issue Implement comprehensive testing infrastructure #20 (Testing Infrastructure)
• Issue Install and configure Cline #4 (Cline configuration testing)