Need some advice n how can I use this approach for auto testing with scripts

Here is the part of code that is giving error import pytest from unittest.mock import Mock, MagicMock from payment_service import PaymentProcessor, PaymentGateway # ========================================== # FIXTURES (Setup / Teardown Architecture) # ========================================== @pytest.fixture def mock_gateway() -> Mock: """Provides a thread-safe, isolated mock instance of the abstract PaymentGateway.""" gateway = Mock(spec=PaymentGateway) # Default behavior setup...