Test.GenCheck is a Haskell library for /generalized proposition-based
testing/. It simultaneously generalizes *QuickCheck* and *SmallCheck*.
Its main novel features are:
* introduces a number of /testing strategies/ and /strategy combinators/
* introduces a variety of test execution methods
* guarantees uniform sampling (at each rank) for the random strategy
* guarantees both uniqueness and coverage of all structures for the
exhaustive strategy
* introduces an /extreme/ strategy for testing unbalanced structures
* also introduces a /uniform/ strategy which does uniform sampling
along an enumeration
* allows different strategies to be mixed; for example one can
exhaustively test all binary trees up to a certain size, filled with
random integers.
* complete separation between properties, generators, testing
strategies and test execution methods
The package is based on a lot of previous research in combinatorics
(combinatorial enumeration of structures and the theory of Species), as
well as a number of established concepts in testing (from a software
engineering perspective). In other words, further to the features
already implemented in this first release, the package contains an
extensible, general framework for generators, test case generation and
management. It can also be very easily generalized to cover many more
combinatorial structures unavailable as Haskell types.
The package also provides interfaces for different levels of usage. In
other words, there is a 'simple' interface for dealing with
straightforward testing, a 'medium' interface for those who want to
explore different testing strategies, and an 'advanced' interface for
access to the full power of GenCheck.
See http://hackage.haskell.org/package/gencheck for further details.
In the source repository (https://github.com/JacquesCarette/GenCheck),
the file tutorial/reverse/TestReverseList.lhs shows the simplest kinds
of tests (standard and deep for structures, or base for unstructured
types) and reporting (checking, testing and full report) for the
classical list reverse function. The files in tutorial/list_zipper show
what can be done with the medium level interface (this tutorial is
currently incomplete). The brave user can read the source code of the
package for the advanced usage -- but we'll write a tutorial for this
too, later.
User beware: this is gencheck-0.1, there are still a few rough edges.
We plan to add a Template Haskell feature to this which should make
deriving enumerators automatic for version 0.2.
Jacques and Gordon
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