Property-based testing is probably the thing I missed the most from my time working with Haskel. It is such an elegant way of testing functionalities that it is hard to not use it. As you can imagine, I look for a Property-based testing framework in any language I have under my hands. Usually, unsuccessfully. However, in recent years I am working a lot with Typescript and, luckily, Typescript has a good property-based testing library: fast-check.