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The Tests Got a Contract Before They Got Code
An agent wrote preconditions, postconditions and undefined behavior before generating a test suite.
Summary
An agent wrote preconditions, postconditions and undefined behavior before generating a test suite.
On production bugs from Google, spec-driven generation improved bug detection by 9.8 percentage points and branch coverage by 2.5 points over the direct agent baseline. An LLM judge also preferred many generated suites, a result that complements but does not replace executable bug and coverage measurements.
Why it matters
An agent wrote preconditions, postconditions and undefined behavior before generating a test suite.
Limits and context
- An LLM judge also preferred many generated suites, a result that complements but does not replace executable bug and coverage measurements.
Key claims
An agent wrote preconditions, postconditions and undefined behavior before generating a test suite.
Qualification: An LLM judge also preferred many generated suites, a result that complements but does not replace executable bug and coverage measurements.
Evidence: source-2026-08-19-021
Sources
- arXiv preprint 2608.17177arXiv · primary research
Corrections
No corrections have been recorded for this story.