← Entropy Atlas
Reproducible randomness
Property-based & randomized testing
Generated inputs explore more cases than a small hand-written test list.
Evaluation card
What “plenty” means here.
- Required property
- A seed printed with every failure so the exact case can be replayed and minimized.
- If it fails
- A “flaky” failure disappears because its random path was not recorded.
- Relevant attacker
- Usually none; the challenge is debugging and representative input generation.
- The Plenty Line
- Use deterministic per-test seeds, retain failing examples, and vary seeds across scheduled runs.
- Why more is not automatically better
- Fresh secret entropy on every run actively harms diagnosis when it prevents replay.
Where it appears
Recognize the pattern.
- 01property-based tests
- 02randomized integration tests
- 03chaos test schedules
The Plentropy rule
Protect the requirement, then stop.
Use deterministic per-test seeds, retain failing examples, and vary seeds across scheduled runs.
Once that claim has comfortable evidence and margin, improve the next limiting factor instead of worshipping a larger entropy number.