Python Testing with pytest

Getting Started with Fixtures

Here’s a simple fixture that returns a number:

ch3/test_fixtures.py

import pytest


@pytest.fixture()
def some_data():
    """Return answer to ultimate question."""
    return 42

def test_some_data(some_data):
    """Use fixture return value in a test."""
    assert some_data == 42

The @pytest.fixture() decorator is used to tell pytest that a function is a fixture. When you include the fixture name in the parameter list of a test function, pytest knows to run it before running the test. Fixtures can do work, and can also return data to the test function.

You don’t need to have a complete understanding of Python decorators to use the decorators included with pytest. pytest uses decorators to add ...