pytest-xdist installation - Framework Patterns

Framework Mode - pytest-xdist installation

Folder Structure for pytest with xdist

project-root/
├── tests/
│   ├── test_example.py
│   └── test_another.py
├── conftest.py
├── pytest.ini
└── requirements.txt
  

Test Framework Layers

• Tests: Python test files inside tests/ folder containing test functions.
• Fixtures: Shared setup code in conftest.py to prepare test environment.
• Configuration: pytest.ini to configure pytest options including xdist settings.
• Dependencies: Managed in requirements.txt including pytest and pytest-xdist.

Configuration Patterns

To install and configure pytest-xdist for parallel test execution:

1. Add pytest-xdist to requirements.txt or install via pip:

pip install pytest-xdist

2. Configure pytest.ini to include any options if needed (optional):

[pytest]
addopts = -n auto

3. Use -n option to specify number of parallel workers when running tests:

pytest -n 4

4. Manage environment variables or credentials separately if needed, but pytest-xdist focuses on parallel execution.

Test Reporting and CI/CD Integration

pytest-xdist runs tests in parallel but integrates seamlessly with pytest reporting.

• Test results are combined and shown in the console after all parallel tests finish.
• Use plugins like pytest-html for HTML reports compatible with xdist.
• In CI/CD pipelines (GitHub Actions, Jenkins, GitLab CI), install pytest-xdist and run tests with pytest -n auto to speed up test execution.
• Ensure test environment supports parallel execution (e.g., isolated test data).

Best Practices for pytest-xdist Framework

• Keep tests independent to avoid conflicts during parallel runs.
• Use fixtures with scope="function" or scope="session" carefully to avoid shared state issues.
• Use pytest.ini to set default parallelism with addopts = -n auto for convenience.
• Monitor resource usage as parallel tests consume more CPU and memory.
• Combine pytest-xdist with other plugins like pytest-rerunfailures for robust test runs.

Self Check

Where in this folder structure would you add a new fixture to prepare a database connection for tests running in parallel?

Key Result

Use pytest-xdist to run tests in parallel by installing the plugin and configuring pytest with the -n option.