Grey Haven's comprehensive testing strategy - Vitest unit/integration/e2e for TypeScript, pytest markers for Python, >80% coverage requirement, fixture patterns, and Doppler for test environments. Use when writing tests, setting up test infrastructure, running tests, debugging test failures, improving coverage, configuring CI/CD, or when user mentions 'test', 'testing', 'pytest', 'vitest', 'coverage', 'TDD', 'test-driven development', 'unit test', 'integration test', 'e2e', 'end-to-end', 'test fixtures', 'mocking', 'test setup', 'CI testing'.
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EXAMPLES.mdREFERENCE.mdchecklists/test-quality-review.mdchecklists/testing-checklist.mdscripts/coverage_check.pyscripts/run_tests.pytemplates/conftest.pytemplates/pytest-integration.pytemplates/pytest-unit.pytemplates/vitest-component.test.tsxtemplates/vitest-integration.test.tstemplates/vitest-unit.test.tstemplates/vitest.config.ts