Python Testing Patterns skill: what it does and how to install it

What it does. Structures Python test suites around unit, integration, functional and performance tests, using pytest, fixtures, mocks, parameterisation and clear arrange-act-assert cases. It covers retry logic, time-dependent behaviour, markers, coverage reports, async code, databases, property-based testing and CI configuration.

When to use it. Use it when writing or debugging Python tests, setting up test infrastructure, applying test-driven development or testing APIs, services and external dependencies.