QuickCheck-2.12: Automatic testing of Haskell programs

Safe HaskellTrustworthy
LanguageHaskell98

Test.QuickCheck.Modifiers

Contents

Description

Modifiers for test data.

These types do things such as restricting the kind of test data that can be generated. They can be pattern-matched on in properties as a stylistic alternative to using explicit quantification.

Note: the contents of this module are re-exported by Test.QuickCheck. You do not need to import it directly.

Examples:

-- Functions cannot be shown (but see Test.QuickCheck.Function)
prop_TakeDropWhile (Blind p) (xs :: [A]) =
  takeWhile p xs ++ dropWhile p xs == xs
prop_TakeDrop (NonNegative n) (xs :: [A]) =
  take n xs ++ drop n xs == xs
-- cycle does not work for empty lists
prop_Cycle (NonNegative n) (NonEmpty (xs :: [A])) =
  take n (cycle xs) == take n (xs ++ cycle xs)
-- Instead of forAll orderedList
prop_Sort (Ordered (xs :: [OrdA])) =
  sort xs == xs
Synopsis

Type-level modifiers for changing generator behavior

newtype Blind a Source #

Blind x: as x, but x does not have to be in the Show class.

Constructors

Blind 

Fields

Instances
Functor Blind Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Blind a -> Blind b #

(<$) :: a -> Blind b -> Blind a #

Enum a => Enum (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

succ :: Blind a -> Blind a #

pred :: Blind a -> Blind a #

toEnum :: Int -> Blind a #

fromEnum :: Blind a -> Int #

enumFrom :: Blind a -> [Blind a] #

enumFromThen :: Blind a -> Blind a -> [Blind a] #

enumFromTo :: Blind a -> Blind a -> [Blind a] #

enumFromThenTo :: Blind a -> Blind a -> Blind a -> [Blind a] #

Eq a => Eq (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: Blind a -> Blind a -> Bool #

(/=) :: Blind a -> Blind a -> Bool #

Integral a => Integral (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

quot :: Blind a -> Blind a -> Blind a #

rem :: Blind a -> Blind a -> Blind a #

div :: Blind a -> Blind a -> Blind a #

mod :: Blind a -> Blind a -> Blind a #

quotRem :: Blind a -> Blind a -> (Blind a, Blind a) #

divMod :: Blind a -> Blind a -> (Blind a, Blind a) #

toInteger :: Blind a -> Integer #

Num a => Num (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(+) :: Blind a -> Blind a -> Blind a #

(-) :: Blind a -> Blind a -> Blind a #

(*) :: Blind a -> Blind a -> Blind a #

negate :: Blind a -> Blind a #

abs :: Blind a -> Blind a #

signum :: Blind a -> Blind a #

fromInteger :: Integer -> Blind a #

Ord a => Ord (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: Blind a -> Blind a -> Ordering #

(<) :: Blind a -> Blind a -> Bool #

(<=) :: Blind a -> Blind a -> Bool #

(>) :: Blind a -> Blind a -> Bool #

(>=) :: Blind a -> Blind a -> Bool #

max :: Blind a -> Blind a -> Blind a #

min :: Blind a -> Blind a -> Blind a #

Real a => Real (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

toRational :: Blind a -> Rational #

Show (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Blind a -> ShowS #

show :: Blind a -> String #

showList :: [Blind a] -> ShowS #

Arbitrary a => Arbitrary (Blind a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

arbitrary :: Gen (Blind a) Source #

shrink :: Blind a -> [Blind a] Source #

newtype Fixed a Source #

Fixed x: as x, but will not be shrunk.

Constructors

Fixed 

Fields

Instances
Functor Fixed Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Fixed a -> Fixed b #

(<$) :: a -> Fixed b -> Fixed a #

Enum a => Enum (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

succ :: Fixed a -> Fixed a #

pred :: Fixed a -> Fixed a #

toEnum :: Int -> Fixed a #

fromEnum :: Fixed a -> Int #

enumFrom :: Fixed a -> [Fixed a] #

enumFromThen :: Fixed a -> Fixed a -> [Fixed a] #

enumFromTo :: Fixed a -> Fixed a -> [Fixed a] #

enumFromThenTo :: Fixed a -> Fixed a -> Fixed a -> [Fixed a] #

Eq a => Eq (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: Fixed a -> Fixed a -> Bool #

(/=) :: Fixed a -> Fixed a -> Bool #

Integral a => Integral (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

quot :: Fixed a -> Fixed a -> Fixed a #

rem :: Fixed a -> Fixed a -> Fixed a #

div :: Fixed a -> Fixed a -> Fixed a #

mod :: Fixed a -> Fixed a -> Fixed a #

quotRem :: Fixed a -> Fixed a -> (Fixed a, Fixed a) #

divMod :: Fixed a -> Fixed a -> (Fixed a, Fixed a) #

toInteger :: Fixed a -> Integer #

Num a => Num (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(+) :: Fixed a -> Fixed a -> Fixed a #

(-) :: Fixed a -> Fixed a -> Fixed a #

(*) :: Fixed a -> Fixed a -> Fixed a #

negate :: Fixed a -> Fixed a #

abs :: Fixed a -> Fixed a #

signum :: Fixed a -> Fixed a #

fromInteger :: Integer -> Fixed a #

Ord a => Ord (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: Fixed a -> Fixed a -> Ordering #

(<) :: Fixed a -> Fixed a -> Bool #

(<=) :: Fixed a -> Fixed a -> Bool #

(>) :: Fixed a -> Fixed a -> Bool #

(>=) :: Fixed a -> Fixed a -> Bool #

max :: Fixed a -> Fixed a -> Fixed a #

min :: Fixed a -> Fixed a -> Fixed a #

Read a => Read (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Real a => Real (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

toRational :: Fixed a -> Rational #

Show a => Show (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Fixed a -> ShowS #

show :: Fixed a -> String #

showList :: [Fixed a] -> ShowS #

Arbitrary a => Arbitrary (Fixed a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

arbitrary :: Gen (Fixed a) Source #

shrink :: Fixed a -> [Fixed a] Source #

newtype OrderedList a Source #

Ordered xs: guarantees that xs is ordered.

Constructors

Ordered 

Fields

Instances
Functor OrderedList Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> OrderedList a -> OrderedList b #

(<$) :: a -> OrderedList b -> OrderedList a #

Eq a => Eq (OrderedList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Ord a => Ord (OrderedList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Read a => Read (OrderedList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Show a => Show (OrderedList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

(Ord a, Arbitrary a) => Arbitrary (OrderedList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

newtype NonEmptyList a Source #

NonEmpty xs: guarantees that xs is non-empty.

Constructors

NonEmpty 

Fields

Instances
Functor NonEmptyList Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> NonEmptyList a -> NonEmptyList b #

(<$) :: a -> NonEmptyList b -> NonEmptyList a #

Eq a => Eq (NonEmptyList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Ord a => Ord (NonEmptyList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Read a => Read (NonEmptyList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Show a => Show (NonEmptyList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Arbitrary a => Arbitrary (NonEmptyList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

data InfiniteList a Source #

InfiniteList xs _: guarantees that xs is an infinite list. When a counterexample is found, only prints the prefix of xs that was used by the program.

Here is a contrived example property:

prop_take_10 :: InfiniteList Char -> Bool
prop_take_10 (InfiniteList xs _) =
  or [ x == 'a' | x <- take 10 xs ]

In the following counterexample, the list must start with "bbbbbbbbbb" but the remaining (infinite) part can contain anything:

>>> quickCheck prop_take_10
*** Failed! Falsifiable (after 1 test and 14 shrinks):
"bbbbbbbbbb" ++ ...

Constructors

InfiniteList 

Fields

Instances
Show a => Show (InfiniteList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Arbitrary a => Arbitrary (InfiniteList a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

newtype Positive a Source #

Positive x: guarantees that x > 0.

Constructors

Positive 

Fields

Instances
Functor Positive Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Positive a -> Positive b #

(<$) :: a -> Positive b -> Positive a #

Enum a => Enum (Positive a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Eq a => Eq (Positive a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: Positive a -> Positive a -> Bool #

(/=) :: Positive a -> Positive a -> Bool #

Ord a => Ord (Positive a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: Positive a -> Positive a -> Ordering #

(<) :: Positive a -> Positive a -> Bool #

(<=) :: Positive a -> Positive a -> Bool #

(>) :: Positive a -> Positive a -> Bool #

(>=) :: Positive a -> Positive a -> Bool #

max :: Positive a -> Positive a -> Positive a #

min :: Positive a -> Positive a -> Positive a #

Read a => Read (Positive a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Show a => Show (Positive a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Positive a -> ShowS #

show :: Positive a -> String #

showList :: [Positive a] -> ShowS #

(Num a, Ord a, Arbitrary a) => Arbitrary (Positive a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

newtype NonZero a Source #

NonZero x: guarantees that x /= 0.

Constructors

NonZero 

Fields

Instances
Functor NonZero Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> NonZero a -> NonZero b #

(<$) :: a -> NonZero b -> NonZero a #

Enum a => Enum (NonZero a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

succ :: NonZero a -> NonZero a #

pred :: NonZero a -> NonZero a #

toEnum :: Int -> NonZero a #

fromEnum :: NonZero a -> Int #

enumFrom :: NonZero a -> [NonZero a] #

enumFromThen :: NonZero a -> NonZero a -> [NonZero a] #

enumFromTo :: NonZero a -> NonZero a -> [NonZero a] #

enumFromThenTo :: NonZero a -> NonZero a -> NonZero a -> [NonZero a] #

Eq a => Eq (NonZero a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: NonZero a -> NonZero a -> Bool #

(/=) :: NonZero a -> NonZero a -> Bool #

Ord a => Ord (NonZero a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: NonZero a -> NonZero a -> Ordering #

(<) :: NonZero a -> NonZero a -> Bool #

(<=) :: NonZero a -> NonZero a -> Bool #

(>) :: NonZero a -> NonZero a -> Bool #

(>=) :: NonZero a -> NonZero a -> Bool #

max :: NonZero a -> NonZero a -> NonZero a #

min :: NonZero a -> NonZero a -> NonZero a #

Read a => Read (NonZero a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Show a => Show (NonZero a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> NonZero a -> ShowS #

show :: NonZero a -> String #

showList :: [NonZero a] -> ShowS #

(Num a, Eq a, Arbitrary a) => Arbitrary (NonZero a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

newtype NonNegative a Source #

NonNegative x: guarantees that x >= 0.

Constructors

NonNegative 

Fields

Instances
Functor NonNegative Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> NonNegative a -> NonNegative b #

(<$) :: a -> NonNegative b -> NonNegative a #

Enum a => Enum (NonNegative a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Eq a => Eq (NonNegative a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Ord a => Ord (NonNegative a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Read a => Read (NonNegative a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Show a => Show (NonNegative a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

(Num a, Ord a, Arbitrary a) => Arbitrary (NonNegative a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

newtype Large a Source #

Large x: by default, QuickCheck generates Ints drawn from a small range. Large Int gives you values drawn from the entire range instead.

Constructors

Large 

Fields

Instances
Functor Large Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Large a -> Large b #

(<$) :: a -> Large b -> Large a #

Enum a => Enum (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

succ :: Large a -> Large a #

pred :: Large a -> Large a #

toEnum :: Int -> Large a #

fromEnum :: Large a -> Int #

enumFrom :: Large a -> [Large a] #

enumFromThen :: Large a -> Large a -> [Large a] #

enumFromTo :: Large a -> Large a -> [Large a] #

enumFromThenTo :: Large a -> Large a -> Large a -> [Large a] #

Eq a => Eq (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: Large a -> Large a -> Bool #

(/=) :: Large a -> Large a -> Bool #

Integral a => Integral (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

quot :: Large a -> Large a -> Large a #

rem :: Large a -> Large a -> Large a #

div :: Large a -> Large a -> Large a #

mod :: Large a -> Large a -> Large a #

quotRem :: Large a -> Large a -> (Large a, Large a) #

divMod :: Large a -> Large a -> (Large a, Large a) #

toInteger :: Large a -> Integer #

Num a => Num (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(+) :: Large a -> Large a -> Large a #

(-) :: Large a -> Large a -> Large a #

(*) :: Large a -> Large a -> Large a #

negate :: Large a -> Large a #

abs :: Large a -> Large a #

signum :: Large a -> Large a #

fromInteger :: Integer -> Large a #

Ord a => Ord (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: Large a -> Large a -> Ordering #

(<) :: Large a -> Large a -> Bool #

(<=) :: Large a -> Large a -> Bool #

(>) :: Large a -> Large a -> Bool #

(>=) :: Large a -> Large a -> Bool #

max :: Large a -> Large a -> Large a #

min :: Large a -> Large a -> Large a #

Read a => Read (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Real a => Real (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

toRational :: Large a -> Rational #

Show a => Show (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Large a -> ShowS #

show :: Large a -> String #

showList :: [Large a] -> ShowS #

Ix a => Ix (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

range :: (Large a, Large a) -> [Large a] #

index :: (Large a, Large a) -> Large a -> Int #

unsafeIndex :: (Large a, Large a) -> Large a -> Int

inRange :: (Large a, Large a) -> Large a -> Bool #

rangeSize :: (Large a, Large a) -> Int #

unsafeRangeSize :: (Large a, Large a) -> Int

(Integral a, Bounded a) => Arbitrary (Large a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

arbitrary :: Gen (Large a) Source #

shrink :: Large a -> [Large a] Source #

newtype Small a Source #

Small x: generates values of x drawn from a small range. The opposite of Large.

Constructors

Small 

Fields

Instances
Functor Small Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Small a -> Small b #

(<$) :: a -> Small b -> Small a #

Enum a => Enum (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

succ :: Small a -> Small a #

pred :: Small a -> Small a #

toEnum :: Int -> Small a #

fromEnum :: Small a -> Int #

enumFrom :: Small a -> [Small a] #

enumFromThen :: Small a -> Small a -> [Small a] #

enumFromTo :: Small a -> Small a -> [Small a] #

enumFromThenTo :: Small a -> Small a -> Small a -> [Small a] #

Eq a => Eq (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: Small a -> Small a -> Bool #

(/=) :: Small a -> Small a -> Bool #

Integral a => Integral (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

quot :: Small a -> Small a -> Small a #

rem :: Small a -> Small a -> Small a #

div :: Small a -> Small a -> Small a #

mod :: Small a -> Small a -> Small a #

quotRem :: Small a -> Small a -> (Small a, Small a) #

divMod :: Small a -> Small a -> (Small a, Small a) #

toInteger :: Small a -> Integer #

Num a => Num (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(+) :: Small a -> Small a -> Small a #

(-) :: Small a -> Small a -> Small a #

(*) :: Small a -> Small a -> Small a #

negate :: Small a -> Small a #

abs :: Small a -> Small a #

signum :: Small a -> Small a #

fromInteger :: Integer -> Small a #

Ord a => Ord (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: Small a -> Small a -> Ordering #

(<) :: Small a -> Small a -> Bool #

(<=) :: Small a -> Small a -> Bool #

(>) :: Small a -> Small a -> Bool #

(>=) :: Small a -> Small a -> Bool #

max :: Small a -> Small a -> Small a #

min :: Small a -> Small a -> Small a #

Read a => Read (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Real a => Real (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

toRational :: Small a -> Rational #

Show a => Show (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Small a -> ShowS #

show :: Small a -> String #

showList :: [Small a] -> ShowS #

Ix a => Ix (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

range :: (Small a, Small a) -> [Small a] #

index :: (Small a, Small a) -> Small a -> Int #

unsafeIndex :: (Small a, Small a) -> Small a -> Int

inRange :: (Small a, Small a) -> Small a -> Bool #

rangeSize :: (Small a, Small a) -> Int #

unsafeRangeSize :: (Small a, Small a) -> Int

Integral a => Arbitrary (Small a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

arbitrary :: Gen (Small a) Source #

shrink :: Small a -> [Small a] Source #

data Smart a Source #

Smart _ x: tries a different order when shrinking.

Constructors

Smart Int a 
Instances
Functor Smart Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Smart a -> Smart b #

(<$) :: a -> Smart b -> Smart a #

Show a => Show (Smart a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Smart a -> ShowS #

show :: Smart a -> String #

showList :: [Smart a] -> ShowS #

Arbitrary a => Arbitrary (Smart a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

arbitrary :: Gen (Smart a) Source #

shrink :: Smart a -> [Smart a] Source #

newtype Shrink2 a Source #

Shrink2 x: allows 2 shrinking steps at the same time when shrinking x

Constructors

Shrink2 

Fields

Instances
Functor Shrink2 Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Shrink2 a -> Shrink2 b #

(<$) :: a -> Shrink2 b -> Shrink2 a #

Enum a => Enum (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

succ :: Shrink2 a -> Shrink2 a #

pred :: Shrink2 a -> Shrink2 a #

toEnum :: Int -> Shrink2 a #

fromEnum :: Shrink2 a -> Int #

enumFrom :: Shrink2 a -> [Shrink2 a] #

enumFromThen :: Shrink2 a -> Shrink2 a -> [Shrink2 a] #

enumFromTo :: Shrink2 a -> Shrink2 a -> [Shrink2 a] #

enumFromThenTo :: Shrink2 a -> Shrink2 a -> Shrink2 a -> [Shrink2 a] #

Eq a => Eq (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(==) :: Shrink2 a -> Shrink2 a -> Bool #

(/=) :: Shrink2 a -> Shrink2 a -> Bool #

Integral a => Integral (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

quot :: Shrink2 a -> Shrink2 a -> Shrink2 a #

rem :: Shrink2 a -> Shrink2 a -> Shrink2 a #

div :: Shrink2 a -> Shrink2 a -> Shrink2 a #

mod :: Shrink2 a -> Shrink2 a -> Shrink2 a #

quotRem :: Shrink2 a -> Shrink2 a -> (Shrink2 a, Shrink2 a) #

divMod :: Shrink2 a -> Shrink2 a -> (Shrink2 a, Shrink2 a) #

toInteger :: Shrink2 a -> Integer #

Num a => Num (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

(+) :: Shrink2 a -> Shrink2 a -> Shrink2 a #

(-) :: Shrink2 a -> Shrink2 a -> Shrink2 a #

(*) :: Shrink2 a -> Shrink2 a -> Shrink2 a #

negate :: Shrink2 a -> Shrink2 a #

abs :: Shrink2 a -> Shrink2 a #

signum :: Shrink2 a -> Shrink2 a #

fromInteger :: Integer -> Shrink2 a #

Ord a => Ord (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

compare :: Shrink2 a -> Shrink2 a -> Ordering #

(<) :: Shrink2 a -> Shrink2 a -> Bool #

(<=) :: Shrink2 a -> Shrink2 a -> Bool #

(>) :: Shrink2 a -> Shrink2 a -> Bool #

(>=) :: Shrink2 a -> Shrink2 a -> Bool #

max :: Shrink2 a -> Shrink2 a -> Shrink2 a #

min :: Shrink2 a -> Shrink2 a -> Shrink2 a #

Read a => Read (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Real a => Real (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

toRational :: Shrink2 a -> Rational #

Show a => Show (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Shrink2 a -> ShowS #

show :: Shrink2 a -> String #

showList :: [Shrink2 a] -> ShowS #

Arbitrary a => Arbitrary (Shrink2 a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

data Shrinking s a Source #

Shrinking _ x: allows for maintaining a state during shrinking.

Constructors

Shrinking s a 
Instances
Functor (Shrinking s) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

fmap :: (a -> b) -> Shrinking s a -> Shrinking s b #

(<$) :: a -> Shrinking s b -> Shrinking s a #

Show a => Show (Shrinking s a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

showsPrec :: Int -> Shrinking s a -> ShowS #

show :: Shrinking s a -> String #

showList :: [Shrinking s a] -> ShowS #

(Arbitrary a, ShrinkState s a) => Arbitrary (Shrinking s a) Source # 
Instance details

Defined in Test.QuickCheck.Modifiers

Methods

arbitrary :: Gen (Shrinking s a) Source #

shrink :: Shrinking s a -> [Shrinking s a] Source #

class ShrinkState s a where Source #

Minimal complete definition

shrinkInit, shrinkState

Methods

shrinkInit :: a -> s Source #

shrinkState :: a -> s -> [(a, s)] Source #

newtype PrintableString Source #

PrintableString: generates a printable unicode String. The string will not contain surrogate pairs.

Constructors

PrintableString