AI Briefing8 Patterns of Vacuous Tests Written by AI and How to Verify Them
·2026.11.13 16:04
Key point
Tests written by AI may pass without any actual verification, so you must verify the source of the expected values.
Details
- Tests written by AI can copy the implementation by recording the results of running the code as expected values
- Presents 8 patterns of vacuous tests that skip verification, such as missing
await, conditionalskip, and absence of assertions - Detects vacuous tests in the following order: regex scanning, checking for 0 executed
expectcalls, injecting API response failures, and mutation testing - Uses Specification-Driven Development (SDD) to provide the specification first and restricts changes to expected values of failing tests to require human approval
- A routine is needed during PR review to verify whether expected values come from the specification or from the implementation
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