Installing and managing plugins in PyTest

Introduction

Plugins add extra features to pytest without changing its core. They help you test better and faster.

You want to add new test report formats like HTML or XML.

You need to run tests in parallel to save time.

You want to check code coverage during tests.

You want to integrate pytest with other tools like Django or Flask.

You want to customize test discovery or add new command line options.

Syntax

PyTest

pip install pytest-plugin-name

# To list installed plugins
pytest --trace-config

# To uninstall a plugin
pip uninstall pytest-plugin-name

Replace pytest-plugin-name with the actual plugin name.

Use pip commands in your terminal or command prompt.

Examples

This installs the pytest-cov plugin to measure test coverage.

PyTest

pip install pytest-cov

This command shows all plugins pytest has loaded and their settings.

PyTest

pytest --trace-config

This removes the pytest-cov plugin from your system.

PyTest

pip uninstall pytest-cov

Sample Program

This example shows how to install the pytest-html plugin, run tests to generate an HTML report, and list all active plugins.

PyTest

# Step 1: Install a plugin
# Run in terminal:
pip install pytest-html

# Step 2: Run tests with the plugin to create an HTML report
pytest --html=report.html

# Step 3: Check installed plugins
pytest --trace-config

Important Notes

Always check plugin compatibility with your pytest version.

Use virtual environments to avoid conflicts between plugins.

Some plugins add new command line options; read their docs to use them well.

Summary

Plugins extend pytest features without changing its core.

Install plugins using pip install and remove with pip uninstall.

Use pytest --trace-config to see active plugins and their settings.