Python Testing

This skill provides comprehensive Python testing patterns using pytest as the primary testing framework.

Testing Framework

Use pytest as the testing framework for its powerful features and clean syntax.

Basic Test Structure

def test_user_creation():
    """Test that a user can be created with valid data"""
    user = User(name="Alice", email="alice@example.com")

    assert user.name == "Alice"
    assert user.email == "alice@example.com"
    assert user.is_active is True

Test Discovery

pytest automatically discovers tests following these conventions:

• Files: test_*.py or *_test.py
• Functions: test_*
• Classes: Test* (without __init__)
• Methods: test_*

Fixtures

Fixtures provide reusable test setup and teardown:

import pytest
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

@pytest.fixture
def db_session():
    """Provide a database session for tests"""
    engine = create_engine("sqlite:///:memory:")
    Session = sessionmaker(bind=engine)
    session = Session()

    # Setup
    Base.metadata.create_all(engine)

    yield session

    # Teardown
    session.close()

d…