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Dev.to
5/9/2026
The Asymmetry of Change: Why Your Tests Are Looking the Wrong Way

The Asymmetry of Change: Why Your Tests Are Looking the Wrong Way

Short summary

Test suites verify past behavior but miss implicit contract breaks—removed guard clauses, narrowed conditions, validation steps skipped in state transitions. Research across 600+ PRs shows 71% contain undetected behavioral risks. Deterministic static analysis at diff time catches these patterns before production incidents.

  • •Tests capture past behavior but miss implicit contract breaks (guard clauses, narrowed conditions)
  • •71% of code PRs without test changes contain behavioral risks undetected by existing tests
  • •Deterministic static analysis at diff time catches pattern-based risks before production

Generated with AI, which can make mistakes.

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