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Dev Guide Proposes Seed-Pinned Merge Gates to Catch Flaws in Agent-Written Tests

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A software engineering post on DEV Community argues that AI agent-generated patches should not be merged solely on the basis of new example tests, which it says only reflect what the agent already knows. The author proposes a three-file merge gate system — using a contracts file, a seed ledger, and a flake-freeze registry — to enforce property-based testing at public API boundaries under reproducible random seeds. Under this policy, a patch that adds only example assertions is blocked, while one that fails a contract under a recorded seed is rejected with the seed and shrunk input attached as evidence. Flaky failures must be frozen with a pinned seed rather than skipped, and the freeze ledger is strictly human-owned to prevent agents from editing it. The system is designed to reverse the incentive for agents to write self-validating tests by requiring every legal input to satisfy the pre-existing contract, not just the fixtures the patch can see.

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