Python

pytest Commands

The most popular Python testing framework. Write simple tests with assert statements, use powerful fixtures, and generate coverage reports.

11 commands

Pro Tips

Use '-x' to stop on first failure, '-v' for verbose output.

Name test files 'test_*.py' and functions 'test_*' for auto-discovery.

Use '@pytest.mark.parametrize' to run tests with multiple inputs.

Common Mistakes

Use '-s' flag to see print statements - pytest captures output by default.

Install pytest-cov separately for coverage reports.

Commands

Run all tests

$ pytest

Run all tests in current directory.

Run with verbose

$ pytest -v

Run tests with verbose output.

Run specific file

$ pytest tests/test_api.py

Run tests in a specific file.

Run specific test

$ pytest tests/test_api.py::test_login

Run a specific test function.

Filter by name

$ pytest -k "login or signup"

Run tests matching name pattern.

Stop on first failure

$ pytest -x

Exit after first test failure.

Show print output

$ pytest -s

Don't capture stdout (show print statements).

Run with coverage

$ pytest --cov=myapp --cov-report=term-missing

Generate coverage report with missing lines.

Run by marker

$ pytest -m slow

Run only tests with specific marker.

Debug on failure

$ pytest --pdb

Drop into debugger on test failure.

Show slowest tests

$ pytest --durations=10

Show 10 slowest tests.