Stability  experimental 

Maintainer  conal@conal.net 
Some QuickCheck helpers
 type Test = (String, Property)
 type TestBatch = (String, [Test])
 unbatch :: TestBatch > [Test]
 checkBatch :: Config > TestBatch > IO ()
 quickBatch :: TestBatch > IO ()
 verboseBatch :: TestBatch > IO ()
 probablisticPureCheck :: Testable a => Config > a > Bool
 type Unop a = a > a
 type Binop a = a > a > a
 genR :: Random a => (a, a) > Gen a
 inverseL :: (EqProp b, Arbitrary b, Show b) => (a > b) > (b > a) > Property
 inverse :: (EqProp a, Arbitrary a, Show a, EqProp b, Arbitrary b, Show b) => (a > b) > (b > a) > Property
 type FracT = Float
 type NumT = Int
 type OrdT = Int
 type T = Char
 class EqProp a where
 eq :: Eq a => a > a > Property
 type BinRel a = a > a > Bool
 reflexive :: (Arbitrary a, Show a) => BinRel a > Property
 transitive :: (Arbitrary a, Show a) => BinRel a > (a > Gen a) > Property
 symmetric :: (Arbitrary a, Show a) => BinRel a > (a > Gen a) > Property
 antiSymmetric :: (Arbitrary a, Show a, Eq a) => BinRel a > (a > Gen a) > Property
 leftId :: (Show a, Arbitrary a, EqProp a) => (i > a > a) > i > Property
 rightId :: (Show a, Arbitrary a, EqProp a) => (a > i > a) > i > Property
 bothId :: (Show a, Arbitrary a, EqProp a) => (a > a > a) > a > Property
 isAssoc :: (EqProp a, Show a, Arbitrary a) => (a > a > a) > Property
 isCommut :: (EqProp a, Show a, Arbitrary a) => (a > a > a) > Property
 commutes :: EqProp z => (a > a > z) > a > a > Property
 data MonoidD a
 monoidD :: Monoid a => MonoidD a
 endoMonoidD :: MonoidD (a > a)
 homomorphism :: (EqProp b, Show a, Arbitrary a) => MonoidD a > MonoidD b > (a > b) > [(String, Property)]
 idempotent :: (Show a, Arbitrary a, EqProp a) => (a > a) > Property
 idempotent2 :: (Show a, Arbitrary a, EqProp a) => (a > a > a) > Property
 idemElem :: EqProp a => (a > a > a) > a > Property
 class Model a b  a > b where
 model :: a > b
 meq :: (Model a b, EqProp b) => a > b > Property
 meq1 :: (Model a b, Model a1 b1, EqProp b) => (a1 > a) > (b1 > b) > a1 > Property
 meq2 :: (Model a b, Model a1 b1, Model a2 b2, EqProp b) => (a1 > a2 > a) > (b1 > b2 > b) > a1 > a2 > Property
 meq3 :: (Model a b, Model a1 b1, Model a2 b2, Model a3 b3, EqProp b) => (a1 > a2 > a3 > a) > (b1 > b2 > b3 > b) > a1 > a2 > a3 > Property
 meq4 :: (Model a b, Model a1 b1, Model a2 b2, Model a3 b3, Model a4 b4, EqProp b) => (a1 > a2 > a3 > a4 > a) > (b1 > b2 > b3 > b4 > b) > a1 > a2 > a3 > a4 > Property
 meq5 :: (Model a b, Model a1 b1, Model a2 b2, Model a3 b3, Model a4 b4, Model a5 b5, EqProp b) => (a1 > a2 > a3 > a4 > a5 > a) > (b1 > b2 > b3 > b4 > b5 > b) > a1 > a2 > a3 > a4 > a5 > Property
 eqModels :: (Model a b, EqProp b) => a > a > Property
 class Model1 f g  f > g where
 model1 :: forall a. f a > g a
 type Positive a = NonZero (NonNegative a)
 newtype NonZero a = NonZero {
 unNonZero :: a
 newtype NonNegative a = NonNegative {
 unNonNegative :: a
 suchThat :: Gen a > (a > Bool) > Gen a
 suchThatMaybe :: Gen a > (a > Bool) > Gen (Maybe a)
 arbs :: Arbitrary a => Int > IO [a]
 gens :: Int > Gen a > IO [a]
 (.&.) :: (Testable prop1, Testable prop2) => prop1 > prop2 > Property
 arbitrarySatisfying :: Arbitrary a => (a > Bool) > Gen a
Misc
checkBatch :: Config > TestBatch > IO ()Source
Run a batch of tests. See quickBatch
and verboseBatch
.
quickBatch :: TestBatch > IO ()Source
Check a batch tersely.
verboseBatch :: TestBatch > IO ()Source
Check a batch verbosely.
probablisticPureCheck :: Testable a => Config > a > BoolSource
inverseL :: (EqProp b, Arbitrary b, Show b) => (a > b) > (b > a) > PropertySource
f
is a left inverse of g
. See also inverse
.
inverse :: (EqProp a, Arbitrary a, Show a, EqProp b, Arbitrary b, Show b) => (a > b) > (b > a) > PropertySource
f
is a left and right inverse of g
. See also inverseL
.
Token Fractional
type for tests
Generalized equality
Types of values that can be tested for equality, perhaps through random sampling.
transitive :: (Arbitrary a, Show a) => BinRel a > (a > Gen a) > PropertySource
Transitive property: a
.
Generate rel
b && b rel
c ==> a rel
ca
randomly, but use gen a
to generate b
and gen b
to
generate c
. gen
ought to satisfy rel
fairly often.
symmetric :: (Arbitrary a, Show a) => BinRel a > (a > Gen a) > PropertySource
Symmetric property: a
. Generate rel
b ==> b rel
aa
randomly, but use gen a
to generate b
. gen
ought to satisfy
rel
fairly often.
antiSymmetric :: (Arbitrary a, Show a, Eq a) => BinRel a > (a > Gen a) > PropertySource
Symmetric property: a
. Generate
rel
b && b rel
a ==> a == ba
randomly, but use gen a
to generate b
. gen
ought to satisfy
both rel
directions fairly often but not always.
leftId :: (Show a, Arbitrary a, EqProp a) => (i > a > a) > i > PropertySource
Has a given left identity, according to '(==)'
rightId :: (Show a, Arbitrary a, EqProp a) => (a > i > a) > i > PropertySource
Has a given right identity, according to '(==)'
bothId :: (Show a, Arbitrary a, EqProp a) => (a > a > a) > a > PropertySource
Has a given left and right identity, according to '(==)'
isAssoc :: (EqProp a, Show a, Arbitrary a) => (a > a > a) > PropertySource
Associative, according to '(==)'
isCommut :: (EqProp a, Show a, Arbitrary a) => (a > a > a) > PropertySource
Commutative, according to '(==)'
endoMonoidD :: MonoidD (a > a)Source
homomorphism :: (EqProp b, Show a, Arbitrary a) => MonoidD a > MonoidD b > (a > b) > [(String, Property)]Source
Homomorphism properties with respect to given monoid dictionaries.
See also monoidMorphism
.
idempotent :: (Show a, Arbitrary a, EqProp a) => (a > a) > PropertySource
The unary function f
is idempotent, i.e., f . f == f
idempotent2 :: (Show a, Arbitrary a, EqProp a) => (a > a > a) > PropertySource
A binary function op
is idempotent, i.e., x
, for all op
x == xx
idemElem :: EqProp a => (a > a > a) > a > PropertySource
A binary function op
is has an idempotent element x
, i.e.,
x
op
x == x
Modelbased (semanticsbased) testing
meq2 :: (Model a b, Model a1 b1, Model a2 b2, EqProp b) => (a1 > a2 > a) > (b1 > b2 > b) > a1 > a2 > PropertySource
meq3 :: (Model a b, Model a1 b1, Model a2 b2, Model a3 b3, EqProp b) => (a1 > a2 > a3 > a) > (b1 > b2 > b3 > b) > a1 > a2 > a3 > PropertySource
meq4 :: (Model a b, Model a1 b1, Model a2 b2, Model a3 b3, Model a4 b4, EqProp b) => (a1 > a2 > a3 > a4 > a) > (b1 > b2 > b3 > b4 > b) > a1 > a2 > a3 > a4 > PropertySource
meq5 :: (Model a b, Model a1 b1, Model a2 b2, Model a3 b3, Model a4 b4, Model a5 b5, EqProp b) => (a1 > a2 > a3 > a4 > a5 > a) > (b1 > b2 > b3 > b4 > b5 > b) > a1 > a2 > a3 > a4 > a5 > PropertySource
Some handy testing types
type Positive a = NonZero (NonNegative a)Source
newtype NonNegative a Source
NonNegative  

Enum a => Enum (NonNegative a)  
Eq a => Eq (NonNegative a)  
Integral a => Integral (NonNegative a)  
Num a => Num (NonNegative a)  
Ord a => Ord (NonNegative a)  
Read a => Read (NonNegative a)  
Real a => Real (NonNegative a)  
Show a => Show (NonNegative a)  
(Num a, Arbitrary a) => Arbitrary (NonNegative a) 
suchThatMaybe :: Gen a > (a > Bool) > Gen (Maybe a)Source
Tries to generate a value that satisfies a predicate.
arbitrarySatisfying :: Arbitrary a => (a > Bool) > Gen aSource