Skip to content

feat(#257): Add Fuzz Testing for AMM Pricing Model#297

Open
JennyT3 wants to merge 1 commit intoceejaylaboratory:mainfrom
JennyT3:feat/257-fuzz-testing-amm
Open

feat(#257): Add Fuzz Testing for AMM Pricing Model#297
JennyT3 wants to merge 1 commit intoceejaylaboratory:mainfrom
JennyT3:feat/257-fuzz-testing-amm

Conversation

@JennyT3
Copy link
Copy Markdown

@JennyT3 JennyT3 commented Apr 26, 2026

Summary

  • Implements fuzz testing for the constant-product AMM formula (x*y=k)
  • Verifies critical invariants across 1000+ iterations per test case
  • Tests cover security properties, edge cases, and mathematical correctness

Fuzz Tests Added

  • Invariant: Swap never drains pool - reserves stay non-negative
  • Invariant: Swap output bounded - output never exceeds available reserves
  • Invariant: K increases only via fees - bounded fee collection
  • Security: No arbitrage extraction - pool always captures positive fees
  • Edge cases: sqrt properties, deposit shares, withdraw proportionality

Testing Results

All 11 tests pass:

  • 10 fuzz tests covering various scenarios
  • 1 basic initialization test

closes #257

- Add invariant tests for constant product formula (x*y=k)
- Verify reserves never become negative after swaps
- Verify swap output bounded by available reserves
- Verify K increases only via fees (bounded)
- Security tests for no arbitrage extraction
- Edge case tests for sqrt, deposit shares, withdraw proportionality
- Run 1000+ iterations per invariant to catch edge cases
@drips-wave
Copy link
Copy Markdown

drips-wave Bot commented Apr 26, 2026

@JennyT3 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

Contract: Add Fuzz testing for AMM pricing model

1 participant