Proptest is a property testing framework (the family of which QuickCheck is perhaps most well-known) inspired by Hypothesis. It allows to test that certain properties of your code hold for arbitrary inputs, and if a failure is found, automatically finds the minimal test case to reproduce the problem. Unlike QuickCheck, generation and shrinking is defined on a per-value basis instead of per-type, which makes it much more flexible and simplifies composition.
For a full introduction and examples, see the documentation.
In my personal usage, everything works pretty well, though the crate itself has a few rough edges.
There may be breaking changes when "impl Trait" becomes stable or when the
possible restructuring of the
rand crate occurs.
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