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Properties First, Fixtures Second, Flakes Never: A Test Contract for Agent Patches

An agent patch is a hypothesis. A test suite is the only evidence a reviewer gets. Most suites fail at that job in three reproducible ways: assertions the agent can reverse-engineer, fixtures that…

  • Layer 1 focuses on property checks to ensure outputs adhere to documented contracts
  • Layer 2 tackles fixture drift by generating fixtures at test time and hashing them
  • Layer 3 introduces flake quarantine to run tests before the agent sees the suite

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