Don't Delete Your Tests - Move Them Up the Stack

A debate over AI-era software testing followed Sazabi founder Sherwood Callaway’s deletion of 811,883 unit-test lines from the company’s monorepo, a move he argued could reduce implementation lock-in, agent workload, CI delays, and token and infrastructure costs. Supporters of reassessing unit tests note that AI-generated tests may merely mirror flawed implementations rather than validate user needs, while critics emphasize that removing unit tests does not eliminate risk but shifts the need for verification toward acceptance, integration, and end-to-end testing. The piece argues that traditional testing pyramids were shaped by the high cost and fragility of end-to-end tests, assumptions that AI-assisted test creation and maintenance may weaken. It recommends retaining focused unit tests for stable pure logic and edge cases while expanding behavior-focused tests around critical user journeys, monitoring production defects during any transition, and using E2E suites as a release criterion for coding agents; it also presents KaneAI and TestMu AI as tools intended to generate, maintain, and run such tests at scale.

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