pytest-factoryboy

import pytest import factory # Assume a simple data model for demonstration class User: def __init__(self, username, email): self.username = username self.email = email def __repr__(self): return f"User(username='{self.username}', email='{self.email}')" # Define your factory_boy factory (e.g., in factories.py or conftest.py) class UserFactory(factory.Factory): class Meta: model = User # Link to your actual model/class username = factory.Sequence(lambda n: f'user{n}') email = factory.LazyAttribute(lambda o: f'{o.username}@example.com') # In your conftest.py or test file, define a fixture that uses `pytest-factoryboy`'s `factory` fixture @pytest.fixture def user_factory(factory): # `factory` is provided by pytest-factoryboy, it returns a callable bound to UserFactory return factory(UserFactory) # Now use your `user_factory` in tests def test_create_single_user(user_factory): user = user_factory() assert user.username.startswith('user') assert user.email.endswith('@example.com') assert isinstance(user, User) def test_create_multiple_users(user_factory): users = user_factory.create_batch(3) assert len(users) == 3 assert all(isinstance(u, User) for u in users) def test_create_user_with_override(user_factory): user = user_factory(username='admin_user', email='admin@example.com') assert user.username == 'admin_user' assert user.email == 'admin@example.com'