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Dev.to
6/30/2026
Green Tests Don't Mean Better Software

Green Tests Don't Mean Better Software

Short summary

Green tests measure spec-conformance, not system improvement—two different axes that teams often conflate. Most shipped code is correct but never proven better because teams only measure one axis. Pair testing with effect measurement (latency, activation, user adherence) to know if changes truly move the needle.

  • •Green tests verify code correctness but not whether the system actually improved
  • •Spec-Driven Development and Hypothesis-Driven Development answer different questions on different axes
  • •Measure both spec-conformance and effect to know if changes are truly beneficial

Generated with AI, which can make mistakes.

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