pytest

pytest is the industry-standard Python testing framework, offering powerful features like fixtures, parametrization, markers, plugins, and seamless integration with FastAPI, Django, and Flask. It provides a simple, scalable approach to testing from unit tests to complex integration scenarios. Key Features : Installation : Run tests: Run tests by marker: Common settings from your projects' pyproject.toml : Typical markers: Reference: see pyproject.toml in claude-mpm , edgar , mcp-vector-search , mcp-ticketer , and kuzu-memory for full lists. Correct: Correct: Correct: Correct: Correct: When using pytest, consider these complementary skills: RED → GREEN → REFACTOR Cycle: RED Phase: Write Failing Test GREEN Phase: Make It Pass REFACTOR Phase: Improve Code Test Structure: Arrange-Act-Assert (AAA) Phase 1: Root Cause Investigation Phase 2: Isolate the Problem Phase 3: Fix Root Cause Phase 4: Verify Solution [Full TDD and debugging workflows available in respective skills if deployed together] pytest Version Compatibility: This skill covers pytest 7.0+ and reflects current best practices for Python testing in 2025. - Fixture system for dependency injection - Parametrization for data-driven tests - Rich assertion introspection (no need for self.assertEqual ) - Plugin ecosystem (pytest-cov, pytest-asyncio, pytest-mock, pytest-django) - Async/await support - Parallel test execution...