integration-test-generator

Integration Test Generator

Generate comprehensive integration tests for Python applications that test multiple interacting components together.

When to Use Integration Tests

Integration tests verify that multiple components work correctly together:

• Service Integration: REST/GraphQL APIs communicating with each other
• Database Integration: Repositories, ORM models, transaction handling
• External Services: Payment gateways, email services, third-party APIs
• Event-Driven: Message queues, event publishers/consumers
• Full Stack: Complete workflows through multiple layers (API → business logic → database)

Test Structure

Basic Integration Test Template

import pytest
from myapp.services import ServiceA, ServiceB

class TestServiceIntegration:
    """Test integration between ServiceA and ServiceB."""

    @pytest.fixture
    def service_a(self):
        """Setup ServiceA with test configuration."""
        return ServiceA(config={"mode": "test"})

    @pytest.fixture
    def service_b(self, service_a):
        """Setup ServiceB that depends on ServiceA."""
        return ServiceB(service_a=service_a)

    def test_services_communicate_correctly(self, service_a, service_b):
        """Test that ServiceB correctly uses ServiceA."""
        # Arrange
        test_data = {"key": "value"}

        # Act
        service_a.store(test_data)
        result = service_b.process()

        # Assert
        assert result["key"] == "value"
        assert result["processed"] is True

Test Fixtures Pattern

Use fixtures to set up and tear down test dependencies:

@pytest.fixture(scope="function")
def db_session():
    """Create a fresh database for each test."""
    engine = create_engine("sqlite:///:memory:")
    Base.metadata.create_all(engine)
    Session = sessionmaker(bind=engine)
    session = Session()

    yield session  # Test runs here

    session.close()

@pytest.fixture
def test_user(db_session):
    """Create a test user and clean up after test."""
    user = User(username="testuser", email="[email protected]")
    db_session.add(user)
    db_session.commit()

    yield user

    db_session.delete(user)
    db_session.commit()