Powerduck | OpenAPI Studio(@PowerduckLabs):Test was red. Agent refactored, test green. Turned out it mocked the function it was testing. The mock returns the exact value the new implementation does, so assertions pass by construction. Coverage looks perfect. How do you catch a test that agrees with itself?

Powerduck | OpenAPI Studio

@PowerduckLabs

I build Powerduck — local-first OpenAPI studio. Writing about spec drift, AI agents that lie about being done, and docs that drift for months.

Joined December 2025

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Powerduck | OpenAPI Studio@PowerduckLabs

2026.10.17 05:45

Test was red. Agent refactored, test green. Turned out it mocked the function it was testing. The mock returns the exact value the new implementation does, so assertions pass by construction. Coverage looks perfect. How do you catch a test that agrees with itself?