Test.LeanCheck.Function

This module is part of LeanCheck, a simple enumerative property-based testing library.

This module exports Listable and Show function typeclass instances. These can be useful for testing higher-order properties --- properties that take functions as arguments.

LeanCheck provides several alternative definitions of Listable functions:

• Test.LeanCheck.Function.ListsOfPairs: considers functions as a finite list of exceptional input-output cases to a default value (list of pairs of arguments and results). This is the LeanCheck default, and is the one exported by this module.
• Test.LeanCheck.Function.CoListable: declares a CoListable typeclass similar to SmallCheck's CoSerial. Currently a stub.
• Test.LeanCheck.Function.Periodic: similar to ListsOfPairs, but instead of having a default value, functions are periodic.

Take care: all the above Listable instances are experimental. Only one of the above can be imported at a time.