fast-check

Derive property based testing fast-check into a fuzzer for REST APIs

Fable bindings for jest and friends for delightful Fable testing.

Harden your Foundry module or system code with end-to-end UI tests directly within Foundry. Powered by Mocha and Chai.

Property based testing (QuickCheck) examples based on fast-check

Generate fast-check arbitraries from Valibot schemas for property-based testing

Generate Fastcheck arbitraries from GraphQL Schema

Discover laws in your code like with QuickSpec

effect-ts Law Testing

PBT workshop in js

fast-check over @testjs/testing

Real-time crypto market screener with Binance order book liquidity heatmap, multi-exchange (Binance/Bybit/OKX/Coinbase/Kraken) screener, 0–100 hotness score, 10 signal detectors, and alerts. Next.js 14 + Fastify 5 + TypeScript. Public APIs only — no keys.

Property-based testing skill for Claude Code and OpenCode: fast-check and Hypothesis, strongest property, honest generators, order-of-arrival properties, failure triage

Breaking 'return true to win' using Property based testing fast-check

Property-based testing for UI components. Generate random user interaction sequences and verify your components maintain their invariants.

Monorepo containing numerical codecs and arbitraries for native JavaScript number types

property-based testing patterns examples

Set of tools and helpers to help JSVerify users to migrate to fast-check

Testing repo for contract tests in Typescript

🐒 A TypeSpec emitter for fast-check arbitraries.

fp-ts but QuickCheck (partial port)