fast-check VS AVA

fast-check

• The 5 principles of Unit Testing
  2 projects | dev.to | 14 Sep 2023

  Libraries like JSVerify or Fast-Check offer essential tools to facilitate property-based testing.

• How to Survive Your Project's First 100k Lines
  4 projects | news.ycombinator.com | 4 May 2023

  Strong agree!

  For JavaScript, I suggest folks check out fast-check [0] and this introduction to property-based testing that uses fast-check [1].

  This is broadly useful, but one specific place I've found it helpful was to check redux reducers against generated lists of actions to find unchecked edge cases and data assumptions.

  [0] https://github.com/dubzzz/fast-check

• [AskJS] Should I be generating random data for parameters when unit testing?
  2 projects | /r/javascript | 5 Mar 2023

  There's a library for exactly that: FastCheck.

• Integrate Jest and fast-check together
  2 projects | dev.to | 20 Oct 2022

  It makes @fast-check/jest, the best option to integrate Jest and fast-check, as it provides an abstraction over both to ease their mutual integration.

• I Created an API to Generate Mock Information
  2 projects | /r/node | 9 Aug 2022
• Generating dummy entities with random data for tests based on types
  4 projects | /r/typescript | 23 Jun 2022

  The closest that I know of (and I have not used this) is zod-fast-check. It generates fast-check “arbitraries” (test data generators) for property-based testing based on zod schemas. Of course, this requires that you use zod to define your types, which has some downsides. Fortunately there is another tool, ts-to-zod, (which I also have not used) which will codegen zod schemas based on TS type definitions. If you thread these four libraries together you should end up with the ability to write random tests on generated data with very little overhead. In theory.

• In praise of property-based testing (2019)
  2 projects | news.ycombinator.com | 3 Apr 2021

  I've been aware of property-based testing for a number of years now, but never had a good opportunity to give it a try. Then the past year I had a piece of serialisation/de-serialisation code, which was the perfect opportunity for a rather simple property-based test. That gave me the hang of it, and found two (minor, but still) bugs.

  Then recently I had a fairly larger, more error prone piece of work that lend itself very well to property-based testing, and it's been a godsend. It helped me discover a number of bugs, this time with the risk of causing privilege escalation. And since the proptests started succeeding reliably, I've been very confident that a rather complex piece of code now actually does what it's supposed to.

  If you're working in JavaScript, I can recommend fast-check [1].

  Another interesting approach, that I haven't yet tried, is Quickstrom [2], basically Puppeteer for proptests. It opens a webpage in a browser, performs some random interactions (pressing buttons, entering data, etc.), and then verifies that properties you specified still hold.

  [1] https://dubzzz.github.io/fast-check.github.com/

  [2] https://quickstrom.io/

• Fastcheck: Property based testing for JavaScript and TypeScript
  4 projects | news.ycombinator.com | 15 Feb 2021

  The about says:

  Property based testing framework for JavaScript (like QuickCheck) written in TypeScript

  source: https://github.com/dubzzz/fast-check

  4 projects | news.ycombinator.com | 15 Feb 2021
• Effective Property-Based Testing
  2 projects | news.ycombinator.com | 3 Feb 2021

  For JS and TypeScript, the best property testing library I've encountered so far is fast-check https://github.com/dubzzz/fast-check

AVA

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Tracking mentions began in Dec 2020.