hypothesis.works articles: Integrated vs type based shrinking

One of the big differences between Hypothesis and Haskell QuickCheck is how shrinking is handled.

Specifically, the way shrinking is handled in Haskell QuickCheck is bad and the way it works in Hypothesis (and also in test.check and EQC) is good. If you’re implementing a property based testing system, you should use the good way. If you’re using a property based testing system and it doesn’t use the good way, you need to know about this failure mode.

Unfortunately many (and possibly most) implementations of property based testing are based on Haskell’s QuickCheck and so make the same mistake.