Hypothesis is a family of testing libraries which let you write tests parametrized
by a source of examples. A Hypothesis implementation then generates simple and
comprehensible examples that make your tests fail. This simplifies writing your
tests and makes them more powerful at the same time, by letting software automate
the boring bits and do them to a higher standard than a human would, freeing you
to focus on the higher level test logic.

This sort of testing is often called "property-based testing", and the most widely
known implementation of the concept is the Haskell library QuickCheck, but
Hypothesis differs significantly from QuickCheck and is designed to fit idiomatically
and easily into existing styles of testing that you are used to, with absolutely no
familiarity with Haskell or functional programming needed.