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Mastering pytest: A Comprehensive Guide

Table of Contents

1. Pytest Drill

1. Pytest Drill

1.1. Running Tests

1.1.1. How do I run all tests in the current directory? drill python_pytest

1.1.1.1. Answer

pytest

1.1.2. How do I run all tests in a specific file? drill python_pytest

1.1.2.1. Answer

pytest <filename>

1.1.3. How do I run a specific test function? drill python_pytest

1.1.3.1. Answer

pytest <filename>::<function_name>

1.1.4. How do I run all tests with a specific marker? drill python_pytest

1.1.4.1. Answer

pytest -m <marker_name>

1.2. Fixtures

1.2.1. What is a fixture in pytest? drill python_pytest

1.2.1.1. Answer

A setup function that provides a fixed baseline so that tests execute reliably and consistently.

1.2.2. How do I define a fixture in pytest? drill python_pytest

1.2.2.1. Answer

Using the `@pytest.fixture` decorator.

1.2.3. How do I use a fixture in a test function? drill python_pytest

1.2.3.1. Answer

By including the fixture name as an argument in the test function.

1.3. Assertions

1.3.1. How do I make an assertion in pytest? drill python_pytest

1.3.1.1. Answer

Using the `assert` statement.

1.3.2. What happens if an assertion fails in pytest? drill python_pytest

1.3.2.1. Answer

The test fails and pytest displays an error message.

1.4. Markers

1.4.1. What is a marker in pytest? drill python_pytest

1.4.1.1. Answer

A way to categorize tests based on certain characteristics.

1.4.2. How do I define a marker in pytest? drill python_pytest

1.4.2.1. Answer

Using the `@pytest.mark` decorator.

1.4.3. How do I run all tests with a specific marker? drill python_pytest

1.4.3.1. Answer

pytest -m <marker_name>

1.5. Skipping Tests

1.5.1. How do I skip a test in pytest? drill python_pytest

1.5.1.1. Answer

Using the `@pytest.mark.skip` decorator.

1.5.2. How do I skip a test based on a condition? drill python_pytest

1.5.2.1. Answer

Using the `@pytest.mark.skipif` decorator.

1.6. Xfail

1.6.1. What is xfail in pytest? drill python_pytest

1.6.1.1. Answer

A way to mark a test as expected to fail.

1.6.2. How do I mark a test as xfail in pytest? drill python_pytest

1.6.2.1. Answer

Using the `@pytest.mark.xfail` decorator.

1.7. Parametrize

1.7.1. What is parametrize in pytest? drill python_pytest

1.7.1.1. Answer

A way to run the same test function with different inputs.

1.7.2. How do I parametrize a test function in pytest? drill python_pytest

1.7.2.1. Answer

Using the `@pytest.mark.parametrize` decorator.

1.8. Plugins

1.8.1. What is a plugin in pytest? drill python_pytest

1.8.1.1. Answer

A way to extend the functionality of pytest.

1.8.2. How do I install a pytest plugin? drill python_pytest

1.8.2.1. Answer

Using pip, e.g. `pip install pytest-<plugin_name>`.