Testing

• Topics
• References

Testing is a critical practice in professional Python development. Python's standard library includes unittest and unittest.mock for writing and isolating tests, while pytest has become the de facto standard for its concise syntax, powerful fixtures, and extensive plugin ecosystem.

This section covers testing patterns that help you write reliable, maintainable tests for your Python code.

Topics

• Pytest — Fixtures, parametrize, built-in fixtures (tmp_path, monkeypatch), assertion introspection, raises/warns
• Unittest Mock — Mock/MagicMock, patch (decorator & context manager), AsyncMock, mock_open, create_autospec

References

• pytest documentation
• unittest.mock — Mock object library
• unittest — Unit testing framework