=== SignalWireClient Tests ===

Testing successful SMS send...
✓ Successful SMS send

Testing invalid phone number validation...
✓ Invalid phone validation

Testing empty message validation...
✓ Empty message validation

Testing message length validation...
✓ Message length validation

Testing fromConfig factory method...
✓ fromConfig factory method

Testing API error handling...
✓ API error handling

Testing invalid JSON handling and phone masking in logs...
✓ Invalid JSON handling (non-JSON with success status treated as success)

Testing invalid JSON with error HTTP status...
✓ Invalid JSON with error status (properly fails)

Testing empty body with success HTTP status...
✓ Empty body with success status (treated as success)

All SignalWireClient tests passed.