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Service Fallback & Graceful Degradation Tests

Tests EU-Utility's ability to handle service unavailability gracefully.

Test Categories

Network Failures

DNS resolution failures
Connection refused
Network unreachable
Service timeouts

Missing Dependencies

OCR engines not installed
requests library missing
paho-mqtt not available
Optional libraries

API Errors

Rate limiting (429)
Authentication failures (401/403)
Server errors (500/503)
Invalid responses

Timeout Handling

Request timeouts
Slow responses
Hanging connections
Retry logic

Expected Graceful Degradation

When Network Fails

Show cached data if available
Display clear error message
Retry with exponential backoff
Never block UI indefinitely

When Dependencies Missing

Disable affected features
Show informative messages
Provide alternatives
Continue with reduced functionality

When API Errors

Handle specific error codes
Implement appropriate retry logic
Show user-friendly messages
Log for debugging

Recovery Mechanisms

Automatic Retry: Exponential backoff for transient failures
Cached Data: Use stale cache when fresh data unavailable
Feature Degradation: Disable features that depend on unavailable services
User Notification: Clear messages about service status
Reconnection: Detect when service returns and resume normal operation