What are pytest fixtures and how do I use them?

What are pytest fixtures and how do I use them?

Pytest fixtures are a way to set up preconditions for your tests. They allow you to create reusable components that can be shared across multiple test functions.

Can you give me an example of a simple fixture?

Sure! Here's a simple fixture that provides a database connection:

import pytest

def db_connection():
    connection = create_connection()
    yield connection
    connection.close()

How do I use this fixture in my tests?

You can use the fixture by adding it as a parameter to your test function. For example:

def test_query(db_connection):
    result = db_connection.query('SELECT * FROM users')
    assert len(result) > 0

What if I need to set up multiple fixtures?

You can define multiple fixtures and use them together by adding them as parameters in your test function. Pytest will handle the setup and teardown for you.