test-harness

Generates comprehensive pytest test suites: happy path, edge cases, error conditions, fixture scaffolding, mock strategy, and async patterns. Analyzes function signatures, dependency chains, and complexity hotspots to produce runnable, parametrized test files. Triggers on: "generate tests", "write tests for", "test this function", "test this class", "create test suite", "what tests should I write", "pytest for", "unit tests for", "mock strategy for", "how to test", "test coverage for", "write a test file". Use this skill when given a Python function, class, or module and asked to produce tests.