Running tests...
✗ test_login_validation
  AssertionError: Invalid username
  File "test_auth.py", line 42
✓ test_user_creation
✗ test_password_strength
  ValueError: Password too weak
  File "test_auth.py", line 89
✓ test_database_connection
✗ test_api_authentication
  ConnectionError: API unavailable
  File "test_api.py", line 156
✗ test_rate_limiting
  AssertionError: Expected 429, got 200
  File "test_api.py", line 201
Tests completed: 2 passed, 4 failed
