Advanced testing with pytest

Intermediate

Developer

Student

Visual Studio Code

Use parametrization, fixtures, and the monkeypatch fixture to write pytest tests with reusable setup and isolated state.

Learning objectives

By the end of this module, you'll be able to:

Use @pytest.mark.parametrize to run one test function with multiple input values.
Create reusable fixtures to share setup and cleanup across tests.
Explain pytest fixture scopes, use yield-based teardown, and share fixtures through conftest.py.
Use the built-in monkeypatch fixture to safely replace functions, values, environment variables, and paths during tests.

Ability to write Python scripts
Familiarity with command-line tools and executing scripts
Basic familiarity with writing and running pytest tests, including test discovery and assertions
Python 3.10 or later, which matches the minimum supported version for pytest 9.x, and pytest installed in a virtual environment. For Windows setup, see Set up your Python development environment on Windows. For Python packaging and pytest setup, see Python's Installing Python modules and pytest's getting started guide.