Python Testing Patterns

Comprehensive guide to implementing robust testing strategies in Python using pytest, fixtures, mocking, parameterization, and property-based testing.

When to Use This Skill

• Writing unit tests for Python functions and classes
• Setting up comprehensive test suites and infrastructure
• Implementing test-driven development (TDD) workflows
• Creating integration tests for APIs, databases, and services
• Mocking external dependencies and third-party services
• Testing async code and concurrent operations
• Implementing property-based testing with Hypothesis
• Setting up CI/CD test automation
• Debugging failing tests and improving test coverage

Core Concepts

Test Discovery: Files matching test_*.py or *_test.py, functions starting with test_