Pytest Adapter Integration Testing

Write production-grade integration tests for Kafka producers and consumers using testcontainers to spin up temporary brokers. Test producer/consumer workflows, message ordering, error handling, and delivery semantics in real Kafka environments.

This skill teaches patterns for building maintainable test data in pytest through factory functions, builder patterns, and fixture factories. Learn to eliminate test data duplication by providing sensible defaults and easy customization for domain objects, complex structures, and parameterized datasets.

Learn a decision-driven framework for mocking in pytest that separates external boundaries from business logic. This skill covers autospec enforcement, async mock patterns, reusable mock factories, and a clear matrix for what to mock versus what to test directly. Master the golden rule—mock external dependencies, test the unit in isolation—to write tests that survive refactoring.

Master async testing in Python with production-ready patterns for pytest-asyncio, async fixtures, and mocking. Covers FastAPI endpoints, Kafka clients, context managers, and async generators with proper event loop isolation.

This skill teaches pytest patterns for testing application layer code—use cases, services, and data transfer objects—with mocked external dependencies at layer boundaries. Learn to structure tests with fixtures, verify orchestration behavior, and validate error handling and recovery logic.

Set up pytest with production-ready configuration patterns covering test discovery, async support, custom markers, and coverage reporting. Includes conftest.py hierarchy examples and fixture scoping strategies for consistent test behavior across environments.