End-to-end scenario testing without mocks, using real dependencies. Test scripts go in .scratch/ (gitignored), patterns documented in scenarios.jsonl (committed). Truth hierarchy - scenarios > unit tests > mocks. Use when validating features end-to-end, testing integrations, writing proof programs, or when scenario-test, e2e-test, integration-test, no-mocks, or --scenario are mentioned.
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references/patterns.md