Pytest Tutorial: Installation, Usage, Parameters, Plugins, Configuration, and Best Practices

This tutorial covers Pytest, a powerful Python testing framework.

1. Installation and verification : Install Pytest with pip install -U pytest and verify the installation using pytest --version to display the installed version.

2. Common runtime parameters : Explains flags such as -v for verbose output, -s to disable output capture, -k to select tests by expression, -m to run tests by marker, -x to stop on first failure, --maxfail=NUM to set allowed failures, --collect-only to list tests without running, --tb=style to control traceback format, and --duration=N to show the slowest N tests.

3. Plugin installation and usage : Lists popular plugins — pytest-cov for coverage reports, pytest-xdist for distributed testing, pytest-django for Django support, pytest-bdd for BDD, and pytest-timeout for test timeouts — and shows how to install ( pip install pytest-NAME ) and uninstall ( pip uninstall pytest-NAME ) them.

4. Configuration file (pytest.ini) : Demonstrates a sample configuration with addopts = -v -s --cov=my_project , testpaths = tests , and custom markers like smoke and integration .

5. Test discovery rules : Outlines naming conventions: test modules must start with test_ or end with _test , test classes must start with Test and lack an __init__ method, and test functions must start with test_ .

6. Overview of commonly used plugins : Repeats the plugin list with brief descriptions of each.

7. Conclusion : Emphasizes Pytest’s flexibility, how mastering its rules, parameters, and plugins can significantly improve testing efficiency and code quality, especially for interface automation testing.