fast-check vs QuickCheck
fast-check
fast-check.devQuickCheck
github.comSide by side
| Figure | fast-check | QuickCheck |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | Yes | — |
| Web | Yes | — |
| Linux | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 1 | 0 |
| Spec score · Property-Based Testing Tools | 8.9 (#1) | 6.5 (#26) |
| Compatibility | Version 4 requires Node.js 12.17.0 or newer, ES2020 support and TypeScript 5.0 or newer when TypeScript is used. | The repository includes a make-hugs script for a Hugs-compatible version, which may also be useful for other non-GHC implementations. |
| Purpose | fast-check is a property-based testing library for JavaScript and TypeScript that generates inputs, runs assertions over many cases, and shrinks failures to smaller counterexamples. | QuickCheck is a Haskell library for random testing of program properties. |
Plans
In their own words
fast-check
fast-check is a property-based testing library for JavaScript and TypeScript. It generates inputs and checks expected behavior across many cases, then reduces a failure to a smaller counterexample to help investigate it. Tests combine arbitraries that create values, properties that describe behavior, runners that execute checks, and plugins that extend runners. It works with Jest, Mocha, Vitest, Ava, Bun, Deno, the Node.js test runner, and other test runners. Runs can be configured with seeds, generated-value sizes, time limits, and result reporting globally or per assertion. fast-check supports stateful testing and reproducible failures; its project also describes fuzzing and generative testing for issues such as race conditions and prototype poisoning. The project is open source under the MIT license, and the listed plan is free. Version 5.x requires Node.js 22.12.0 or later and ECMAScript 2025; TypeScript 5.8 or later is optional.