Combinators for Quickcheck Property construction and diagnostics http://www.github.com/jfeltz/quickcheck-property-comb

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PublicDomain licensed by John Feltz
Maintained by jfeltz@gmail.com

These are simple monads that aim to reduce the pain of composing invariants/properties, and the documenting of those invariants for determining the cause of failure. Specifically, they provide a tool for effective diagnostic for invariants with changing post-conditions, leading to a faster cause-of-failure diagnosis.

Example case for invariants on a data structure Consumers:

data (Ord l) => Consumers l =
    introduced :: S.Set l,
    met :: M.Map (S.Set l) Bool,
    disjoints :: Disjoints l

disjoints_odds ::  Inv (Disjoints l)
disjoints_odds = do
 doc "no odd sets in disjoints"
 disjoint_sets <- cause
 return False

disjoints_non_singletons :: Inv (Disjoints l)
disjoints_non_singletons = do
  return True

disjoints_inv :: Invariants (Disjoints l)
disjoints_inv= do
  sat disjoints_odds
  sat disjoints_non_singletons

introduced_in_disjoint :: Inv (Consumers l)
introduced_in_disjoint = do
  doc "all at quantity are a singleton subset in disjoints"
  subsets       <- (map S.singleton) . S.toList . introduced <$> cause
  disjoint_sets <- disjoints <$> cause
  return . and . map ((flip S.member) disjoint_sets) $ subsets

inv_consumers :: Invariants (Consumers l)
inv_consumers = do
  satcomp disjoints disjoints_inv
  satcomp met met_inv
  sat introduced_in_disjoint

And to run the invariants on generated cases:

prop_testedFunction :: Arg -> Property
prop_testedFunction arg =
 let consumers = testedFunction arg in
   runInvariants consumers inv_consumers
Depends on 3 packages:
Used by 1 package:
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