-- Hoogle documentation, generated by Haddock
-- See Hoogle, http://www.haskell.org/hoogle/


-- | Automatic testing of Haskell programs
--   
--   QuickCheck is a library for random testing of program properties.
--   
--   The programmer provides a specification of the program, in the form of
--   properties which functions should satisfy, and QuickCheck then tests
--   that the properties hold in a large number of randomly generated
--   cases.
--   
--   Specifications are expressed in Haskell, using combinators defined in
--   the QuickCheck library. QuickCheck provides combinators to define
--   properties, observe the distribution of test data, and define test
--   data generators.
@package QuickCheck
@version 2.4.2

module Test.QuickCheck.Text
newtype Str
MkStr :: String -> Str
ranges :: (Show a, Integral a) => a -> a -> Str
number :: Int -> String -> String
short :: Int -> String -> String
showErr :: Show a => a -> String
bold :: String -> String
newTerminal :: Output -> Output -> IO Terminal
newStdioTerminal :: IO Terminal
newNullTerminal :: IO Terminal
terminalOutput :: Terminal -> IO String
handle :: Handle -> String -> IO ()
data Terminal
putPart, putLine, putTemp :: Terminal -> String -> IO ()
instance Show Str

module Test.QuickCheck.State

-- | State represents QuickCheck's internal state while testing a property.
--   The state is made visible to callback functions.
data State
MkState :: Terminal -> Int -> Int -> (Int -> Int -> Int) -> Int -> Int -> [[(String, Int)]] -> Bool -> StdGen -> Int -> Int -> State

-- | the current terminal
terminal :: State -> Terminal

-- | maximum number of successful tests needed
maxSuccessTests :: State -> Int

-- | maximum number of tests that can be discarded
maxDiscardedTests :: State -> Int

-- | how to compute the size of test cases from discarded tests
computeSize :: State -> Int -> Int -> Int

-- | the current number of tests that have succeeded
numSuccessTests :: State -> Int

-- | the current number of discarded tests
numDiscardedTests :: State -> Int

-- | all labels that have been collected so far
collected :: State -> [[(String, Int)]]

-- | indicates if the property is expected to fail
expectedFailure :: State -> Bool

-- | the current random seed
randomSeed :: State -> StdGen

-- | number of successful shrinking steps so far
numSuccessShrinks :: State -> Int

-- | number of failed shrinking steps since the last successful shrink
numTryShrinks :: State -> Int


-- | Test case generation.
module Test.QuickCheck.Gen
newtype Gen a
MkGen :: (StdGen -> Int -> a) -> Gen a
unGen :: Gen a -> StdGen -> Int -> a

-- | Modifies a generator using an integer seed.
variant :: Integral n => n -> Gen a -> Gen a

-- | Used to construct generators that depend on the size parameter.
sized :: (Int -> Gen a) -> Gen a

-- | Overrides the size parameter. Returns a generator which uses the given
--   size instead of the runtime-size parameter.
resize :: Int -> Gen a -> Gen a

-- | Generates a random element in the given inclusive range.
choose :: Random a => (a, a) -> Gen a

-- | Promotes a monadic generator to a generator of monadic values.
promote :: Monad m => m (Gen a) -> Gen (m a)

-- | Generates some example values.
sample' :: Gen a -> IO [a]

-- | Generates some example values and prints them to <tt>stdout</tt>.
sample :: Show a => Gen a -> IO ()

-- | Generates a value that satisfies a predicate.
suchThat :: Gen a -> (a -> Bool) -> Gen a

-- | Tries to generate a value that satisfies a predicate.
suchThatMaybe :: Gen a -> (a -> Bool) -> Gen (Maybe a)

-- | Randomly uses one of the given generators. The input list must be
--   non-empty.
oneof :: [Gen a] -> Gen a

-- | Chooses one of the given generators, with a weighted random
--   distribution. The input list must be non-empty.
frequency :: [(Int, Gen a)] -> Gen a

-- | Generates one of the given values. The input list must be non-empty.
elements :: [a] -> Gen a

-- | Takes a list of elements of increasing size, and chooses among an
--   initial segment of the list. The size of this initial segment
--   increases with the size parameter. The input list must be non-empty.
growingElements :: [a] -> Gen a

-- | Generates a list of random length. The maximum length depends on the
--   size parameter.
listOf :: Gen a -> Gen [a]

-- | Generates a non-empty list of random length. The maximum length
--   depends on the size parameter.
listOf1 :: Gen a -> Gen [a]

-- | Generates a list of the given length.
vectorOf :: Int -> Gen a -> Gen [a]
instance Monad Gen
instance Applicative Gen
instance Functor Gen

module Test.QuickCheck.Arbitrary

-- | Random generation and shrinking of values.
class Arbitrary a where arbitrary = error "no default generator" shrink _ = []
arbitrary :: Arbitrary a => Gen a
shrink :: Arbitrary a => a -> [a]

-- | Used for random generation of functions.
class CoArbitrary a
coarbitrary :: CoArbitrary a => a -> Gen c -> Gen c

-- | Generates an integral number. The number can be positive or negative
--   and its maximum absolute value depends on the size parameter.
arbitrarySizedIntegral :: Num a => Gen a

-- | Generates an integral number. The number is chosen uniformly from the
--   entire range of the type. You may want to use
--   <a>arbitrarySizedBoundedIntegral</a> instead.
arbitraryBoundedIntegral :: (Bounded a, Integral a) => Gen a

-- | Generates an integral number from a bounded domain. The number is
--   chosen from the entire range of the type, but small numbers are
--   generated more often than big numbers. Inspired by demands from Phil
--   Wadler.
arbitrarySizedBoundedIntegral :: (Bounded a, Integral a) => Gen a

-- | Generates a fractional number. The number can be positive or negative
--   and its maximum absolute value depends on the size parameter.
arbitrarySizedFractional :: Fractional a => Gen a

-- | Generates an element of a bounded type. The element is chosen from the
--   entire range of the type.
arbitraryBoundedRandom :: (Bounded a, Random a) => Gen a

-- | Returns no shrinking alternatives.
shrinkNothing :: a -> [a]
shrinkList :: (a -> [a]) -> [a] -> [[a]]

-- | Shrink an integral number.
shrinkIntegral :: Integral a => a -> [a]

-- | Shrink a fraction.
shrinkRealFrac :: RealFrac a => a -> [a]

-- | Combine two generator perturbing functions, for example the results of
--   calls to <a>variant</a> or <a>coarbitrary</a>.
(><) :: (Gen a -> Gen a) -> (Gen a -> Gen a) -> (Gen a -> Gen a)

-- | A <a>coarbitrary</a> implementation for integral numbers.
coarbitraryIntegral :: Integral a => a -> Gen b -> Gen b

-- | A <a>coarbitrary</a> implementation for real numbers.
coarbitraryReal :: Real a => a -> Gen b -> Gen b

-- | <a>coarbitrary</a> helper for lazy people :-).
coarbitraryShow :: Show a => a -> Gen b -> Gen b

-- | Generates a list of a given length.
vector :: Arbitrary a => Int -> Gen [a]

-- | Generates an ordered list of a given length.
orderedList :: (Ord a, Arbitrary a) => Gen [a]
instance CoArbitrary Double
instance CoArbitrary Float
instance CoArbitrary Char
instance CoArbitrary Word64
instance CoArbitrary Word32
instance CoArbitrary Word16
instance CoArbitrary Word8
instance CoArbitrary Word
instance CoArbitrary Int64
instance CoArbitrary Int32
instance CoArbitrary Int16
instance CoArbitrary Int8
instance CoArbitrary Int
instance CoArbitrary Integer
instance (CoArbitrary a, CoArbitrary b, CoArbitrary c, CoArbitrary d, CoArbitrary e) => CoArbitrary (a, b, c, d, e)
instance (CoArbitrary a, CoArbitrary b, CoArbitrary c, CoArbitrary d) => CoArbitrary (a, b, c, d)
instance (CoArbitrary a, CoArbitrary b, CoArbitrary c) => CoArbitrary (a, b, c)
instance (CoArbitrary a, CoArbitrary b) => CoArbitrary (a, b)
instance (RealFloat a, CoArbitrary a) => CoArbitrary (Complex a)
instance (Integral a, CoArbitrary a) => CoArbitrary (Ratio a)
instance CoArbitrary a => CoArbitrary [a]
instance (CoArbitrary a, CoArbitrary b) => CoArbitrary (Either a b)
instance CoArbitrary a => CoArbitrary (Maybe a)
instance CoArbitrary Bool
instance CoArbitrary ()
instance (Arbitrary a, CoArbitrary b) => CoArbitrary (a -> b)
instance Arbitrary Double
instance Arbitrary Float
instance Arbitrary Char
instance Arbitrary Word64
instance Arbitrary Word32
instance Arbitrary Word16
instance Arbitrary Word8
instance Arbitrary Word
instance Arbitrary Int64
instance Arbitrary Int32
instance Arbitrary Int16
instance Arbitrary Int8
instance Arbitrary Int
instance Arbitrary Integer
instance (Arbitrary a, Arbitrary b, Arbitrary c, Arbitrary d, Arbitrary e) => Arbitrary (a, b, c, d, e)
instance (Arbitrary a, Arbitrary b, Arbitrary c, Arbitrary d) => Arbitrary (a, b, c, d)
instance (Arbitrary a, Arbitrary b, Arbitrary c) => Arbitrary (a, b, c)
instance (Arbitrary a, Arbitrary b) => Arbitrary (a, b)
instance (RealFloat a, Arbitrary a) => Arbitrary (Complex a)
instance (Integral a, Arbitrary a) => Arbitrary (Ratio a)
instance Arbitrary a => Arbitrary [a]
instance (Arbitrary a, Arbitrary b) => Arbitrary (Either a b)
instance Arbitrary a => Arbitrary (Maybe a)
instance Arbitrary Bool
instance Arbitrary ()
instance (CoArbitrary a, Arbitrary b) => Arbitrary (a -> b)


-- | Types to help with testing polymorphic properties.
--   
--   Types <a>A</a>, <a>B</a> and <a>C</a> are <tt>newtype</tt> wrappers
--   around <a>Integer</a> that implement <a>Eq</a>, <a>Show</a>,
--   <a>Arbitrary</a> and <a>CoArbitrary</a>. Types <a>OrdA</a>,
--   <a>OrdB</a> and <a>OrdC</a> also implement <a>Ord</a> and <a>Num</a>.
--   
--   See also <a>Test.QuickCheck.All</a> for an experimental way of testing
--   polymorphic properties.
module Test.QuickCheck.Poly
newtype A
A :: Integer -> A
unA :: A -> Integer
newtype B
B :: Integer -> B
unB :: B -> Integer
newtype C
C :: Integer -> C
unC :: C -> Integer
newtype OrdA
OrdA :: Integer -> OrdA
unOrdA :: OrdA -> Integer
newtype OrdB
OrdB :: Integer -> OrdB
unOrdB :: OrdB -> Integer
newtype OrdC
OrdC :: Integer -> OrdC
unOrdC :: OrdC -> Integer
instance Eq A
instance Eq B
instance Eq C
instance Eq OrdA
instance Ord OrdA
instance Num OrdA
instance Eq OrdB
instance Ord OrdB
instance Num OrdB
instance Eq OrdC
instance Ord OrdC
instance Num OrdC
instance CoArbitrary OrdC
instance Arbitrary OrdC
instance Show OrdC
instance CoArbitrary OrdB
instance Arbitrary OrdB
instance Show OrdB
instance CoArbitrary OrdA
instance Arbitrary OrdA
instance Show OrdA
instance CoArbitrary C
instance Arbitrary C
instance Show C
instance CoArbitrary B
instance Arbitrary B
instance Show B
instance CoArbitrary A
instance Arbitrary A
instance Show A


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

-- | <tt>Blind x</tt>: as x, but x does not have to be in the <a>Show</a>
--   class.
newtype Blind a
Blind :: a -> Blind a

-- | <tt>Fixed x</tt>: as x, but will not be shrunk.
newtype Fixed a
Fixed :: a -> Fixed a

-- | <tt>Ordered xs</tt>: guarantees that xs is ordered.
newtype OrderedList a
Ordered :: [a] -> OrderedList a

-- | <tt>NonEmpty xs</tt>: guarantees that xs is non-empty.
newtype NonEmptyList a
NonEmpty :: [a] -> NonEmptyList a

-- | <tt>Positive x</tt>: guarantees that <tt>x &gt; 0</tt>.
newtype Positive a
Positive :: a -> Positive a

-- | <tt>NonZero x</tt>: guarantees that <tt>x /= 0</tt>.
newtype NonZero a
NonZero :: a -> NonZero a

-- | <tt>NonNegative x</tt>: guarantees that <tt>x &gt;= 0</tt>.
newtype NonNegative a
NonNegative :: a -> NonNegative a

-- | <tt>Smart _ x</tt>: tries a different order when shrinking.
data Smart a
Smart :: Int -> a -> Smart a

-- | <tt>Shrink2 x</tt>: allows 2 shrinking steps at the same time when
--   shrinking x
newtype Shrink2 a
Shrink2 :: a -> Shrink2 a

-- | <tt>Shrinking _ x</tt>: allows for maintaining a state during
--   shrinking.
data Shrinking s a
Shrinking :: s -> a -> Shrinking s a
class ShrinkState s a
shrinkInit :: ShrinkState s a => a -> s
shrinkState :: ShrinkState s a => a -> s -> [(a, s)]
instance Eq a => Eq (Blind a)
instance Ord a => Ord (Blind a)
instance Num a => Num (Blind a)
instance Integral a => Integral (Blind a)
instance Real a => Real (Blind a)
instance Enum a => Enum (Blind a)
instance Eq a => Eq (Fixed a)
instance Ord a => Ord (Fixed a)
instance Show a => Show (Fixed a)
instance Read a => Read (Fixed a)
instance Num a => Num (Fixed a)
instance Integral a => Integral (Fixed a)
instance Real a => Real (Fixed a)
instance Enum a => Enum (Fixed a)
instance Eq a => Eq (OrderedList a)
instance Ord a => Ord (OrderedList a)
instance Show a => Show (OrderedList a)
instance Read a => Read (OrderedList a)
instance Eq a => Eq (NonEmptyList a)
instance Ord a => Ord (NonEmptyList a)
instance Show a => Show (NonEmptyList a)
instance Read a => Read (NonEmptyList a)
instance Eq a => Eq (Positive a)
instance Ord a => Ord (Positive a)
instance Show a => Show (Positive a)
instance Read a => Read (Positive a)
instance Num a => Num (Positive a)
instance Integral a => Integral (Positive a)
instance Real a => Real (Positive a)
instance Enum a => Enum (Positive a)
instance Eq a => Eq (NonZero a)
instance Ord a => Ord (NonZero a)
instance Show a => Show (NonZero a)
instance Read a => Read (NonZero a)
instance Num a => Num (NonZero a)
instance Integral a => Integral (NonZero a)
instance Real a => Real (NonZero a)
instance Enum a => Enum (NonZero a)
instance Eq a => Eq (NonNegative a)
instance Ord a => Ord (NonNegative a)
instance Show a => Show (NonNegative a)
instance Read a => Read (NonNegative a)
instance Num a => Num (NonNegative a)
instance Integral a => Integral (NonNegative a)
instance Real a => Real (NonNegative a)
instance Enum a => Enum (NonNegative a)
instance Eq a => Eq (Shrink2 a)
instance Ord a => Ord (Shrink2 a)
instance Show a => Show (Shrink2 a)
instance Read a => Read (Shrink2 a)
instance Num a => Num (Shrink2 a)
instance Integral a => Integral (Shrink2 a)
instance Real a => Real (Shrink2 a)
instance Enum a => Enum (Shrink2 a)
instance (Arbitrary a, ShrinkState s a) => Arbitrary (Shrinking s a)
instance Show a => Show (Shrinking s a)
instance Arbitrary a => Arbitrary (Smart a)
instance Show a => Show (Smart a)
instance Arbitrary a => Arbitrary (Shrink2 a)
instance (Num a, Ord a, Arbitrary a) => Arbitrary (NonNegative a)
instance (Num a, Ord a, Arbitrary a) => Arbitrary (NonZero a)
instance (Num a, Ord a, Arbitrary a) => Arbitrary (Positive a)
instance Arbitrary a => Arbitrary (NonEmptyList a)
instance (Ord a, Arbitrary a) => Arbitrary (OrderedList a)
instance Arbitrary a => Arbitrary (Fixed a)
instance Arbitrary a => Arbitrary (Blind a)
instance Show (Blind a)


-- | Generation of random shrinkable, showable functions. Not really
--   documented at the moment!
--   
--   Example of use:
--   
--   <pre>
--   &gt;&gt;&gt; :{
--   
--   &gt;&gt;&gt; let prop :: Fun String Integer -&gt; Bool
--   
--   &gt;&gt;&gt; prop (Fun _ f) = f "monkey" == f "banana" || f "banana" == f "elephant"
--   
--   &gt;&gt;&gt; :}
--   
--   &gt;&gt;&gt; quickCheck prop
--   *** Failed! Falsifiable (after 3 tests and 134 shrinks):     
--   {"elephant"-&gt;1, "monkey"-&gt;1, _-&gt;0}
--   </pre>
--   
--   To generate random values of type <tt><a>Fun</a> a b</tt>, you must
--   have an instance <tt><a>Function</a> a</tt>. If your type has a
--   <a>Show</a> instance, you can use <a>functionShow</a> to write the
--   instance; otherwise, use <a>functionMap</a> to give a bijection
--   between your type and a type that is already an instance of
--   <a>Function</a>. See the <tt><a>Function</a> [a]</tt> instance for an
--   example of the latter.
module Test.QuickCheck.Function
data Fun a b
Fun :: (a :-> b, b) -> (a -> b) -> Fun a b
apply :: Fun a b -> (a -> b)
data (:->) a c
class Function a
function :: Function a => (a -> b) -> (a :-> b)
functionMap :: Function b => (a -> b) -> (b -> a) -> (a -> c) -> (a :-> c)
functionShow :: (Show a, Read a) => (a -> c) -> (a :-> c)
instance (Function a, CoArbitrary a, Arbitrary b) => Arbitrary (Fun a b)
instance (Show a, Show b) => Show (Fun a b)
instance (Function a, CoArbitrary a, Arbitrary b) => Arbitrary (a :-> b)
instance Function OrdC
instance Function OrdB
instance Function OrdA
instance Function C
instance Function B
instance Function A
instance Function Char
instance Function Int
instance Function Integer
instance Function Bool
instance Function a => Function (Maybe a)
instance Function a => Function [a]
instance (Function a, Function b) => Function (Either a b)
instance (Function a, Function b) => Function (a, b)
instance Function Word8
instance Function ()
instance Monad Steps
instance (Show a, Show b) => Show (a :-> b)
instance Functor ((:->) a)

module Test.QuickCheck.Property
type Property = Gen Prop

-- | The class of things which can be tested, i.e. turned into a property.
class Testable prop
property :: Testable prop => prop -> Property

-- | Do I/O inside a property. This can obviously lead to unrepeatable
--   testcases, so use with care.
morallyDubiousIOProperty :: Testable prop => IO prop -> Property
protect :: (AnException -> a) -> IO a -> IO a
newtype Prop
MkProp :: Rose Result -> Prop
unProp :: Prop -> Rose Result
data Rose a
MkRose :: a -> [Rose a] -> Rose a
IORose :: (IO (Rose a)) -> Rose a
ioRose :: IO (Rose Result) -> Rose Result
joinRose :: Rose (Rose a) -> Rose a
reduceRose :: Rose Result -> IO (Rose Result)
onRose :: (a -> [Rose a] -> Rose a) -> Rose a -> Rose a
protectRose :: IO (Rose Result) -> IO (Rose Result)
protectResults :: Rose Result -> Rose Result

-- | Different kinds of callbacks
data Callback

-- | Called just after a test
PostTest :: CallbackKind -> (State -> Result -> IO ()) -> Callback

-- | Called with the final failing test-case
PostFinalFailure :: CallbackKind -> (State -> Result -> IO ()) -> Callback
data CallbackKind

-- | Affected by the <a>verbose</a> combinator
Counterexample :: CallbackKind

-- | Not affected by the <a>verbose</a> combinator
NotCounterexample :: CallbackKind

-- | The result of a single test.
data Result
MkResult :: Maybe Bool -> Bool -> String -> Bool -> [(String, Int)] -> [Callback] -> Result

-- | result of the test case; Nothing = discard
ok :: Result -> Maybe Bool

-- | indicates what the expected result of the property is
expect :: Result -> Bool

-- | a message indicating what went wrong
reason :: Result -> String

-- | indicates if the test case was cancelled by pressing ^C
interrupted :: Result -> Bool

-- | the collected values for this test case
stamp :: Result -> [(String, Int)]

-- | the callbacks for this test case
callbacks :: Result -> [Callback]
result :: Result
exception :: String -> AnException -> Result
protectResult :: IO Result -> IO Result
succeeded :: Result
failed :: Result
rejected :: Result
liftBool :: Bool -> Result
mapResult :: Testable prop => (Result -> Result) -> prop -> Property
mapTotalResult :: Testable prop => (Result -> Result) -> prop -> Property
mapRoseResult :: Testable prop => (Rose Result -> Rose Result) -> prop -> Property
mapProp :: Testable prop => (Prop -> Prop) -> prop -> Property

-- | Changes the maximum test case size for a property.
mapSize :: Testable prop => (Int -> Int) -> prop -> Property

-- | Shrinks the argument to property if it fails. Shrinking is done
--   automatically for most types. This is only needed when you want to
--   override the default behavior.
shrinking :: Testable prop => (a -> [a]) -> a -> (a -> prop) -> Property

-- | Disables shrinking for a property altogether.
noShrinking :: Testable prop => prop -> Property

-- | Adds a callback
callback :: Testable prop => Callback -> prop -> Property

-- | Prints a message to the terminal as part of the counterexample.
printTestCase :: Testable prop => String -> prop -> Property

-- | Performs an <a>IO</a> action after the last failure of a property.
whenFail :: Testable prop => IO () -> prop -> Property

-- | Performs an <a>IO</a> action every time a property fails. Thus, if
--   shrinking is done, this can be used to keep track of the failures
--   along the way.
whenFail' :: Testable prop => IO () -> prop -> Property

-- | Prints out the generated testcase every time the property is tested,
--   like <tt>verboseCheck</tt> from QuickCheck 1. Only variables
--   quantified over <i>inside</i> the <a>verbose</a> are printed.
verbose :: Testable prop => prop -> Property

-- | Modifies a property so that it is expected to fail for some test
--   cases.
expectFailure :: Testable prop => prop -> Property

-- | Attaches a label to a property. This is used for reporting test case
--   distribution.
label :: Testable prop => String -> prop -> Property

-- | Labels a property with a value:
--   
--   <pre>
--   collect x = label (show x)
--   </pre>
collect :: (Show a, Testable prop) => a -> prop -> Property

-- | Conditionally labels test case.
classify :: Testable prop => Bool -> String -> prop -> Property

-- | Checks that at least the given proportion of the test cases belong to
--   the given class.
cover :: Testable prop => Bool -> Int -> String -> prop -> Property

-- | Implication for properties: The resulting property holds if the first
--   argument is <a>False</a>, or if the given property holds.
(==>) :: Testable prop => Bool -> prop -> Property

-- | Considers a property failed if it does not complete within the given
--   number of microseconds.
within :: Testable prop => Int -> prop -> Property

-- | Explicit universal quantification: uses an explicitly given test case
--   generator.
forAll :: (Show a, Testable prop) => Gen a -> (a -> prop) -> Property

-- | Like <a>forAll</a>, but tries to shrink the argument for failing test
--   cases.
forAllShrink :: (Show a, Testable prop) => Gen a -> (a -> [a]) -> (a -> prop) -> Property

-- | Nondeterministic choice: <tt>p1</tt> <a>.&amp;.</a> <tt>p2</tt> picks
--   randomly one of <tt>p1</tt> and <tt>p2</tt> to test. If you test the
--   property 100 times it makes 100 random choices.
(.&.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

-- | Conjunction: <tt>p1</tt> <a>.&amp;&amp;.</a> <tt>p2</tt> passes if
--   both <tt>p1</tt> and <tt>p2</tt> pass.
(.&&.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

-- | Take the conjunction of several properties.
conjoin :: Testable prop => [prop] -> Property

-- | Disjunction: <tt>p1</tt> <a>.||.</a> <tt>p2</tt> passes unless
--   <tt>p1</tt> and <tt>p2</tt> simultaneously fail.
(.||.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

-- | Take the disjunction of several properties.
disjoin :: Testable prop => [prop] -> Property
instance Monad Rose
instance Functor Rose
instance (Arbitrary a, Show a, Testable prop) => Testable (a -> prop)
instance Testable prop => Testable (Gen prop)
instance Testable Prop
instance Testable Result
instance Testable Bool
instance Testable ()

module Test.QuickCheck.Test

-- | Args specifies arguments to the QuickCheck driver
data Args
Args :: Maybe (StdGen, Int) -> Int -> Int -> Int -> Bool -> Args

-- | should we replay a previous test?
replay :: Args -> Maybe (StdGen, Int)

-- | maximum number of successful tests before succeeding
maxSuccess :: Args -> Int

-- | maximum number of discarded tests before giving up
maxDiscard :: Args -> Int

-- | size to use for the biggest test cases
maxSize :: Args -> Int

-- | whether to print anything
chatty :: Args -> Bool

-- | Result represents the test result
data Result
Success :: Int -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String
GaveUp :: Int -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String
Failure :: Int -> Int -> StdGen -> Int -> String -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | number of successful shrinking steps performed
numShrinks :: Result -> Int

-- | what seed was used
usedSeed :: Result -> StdGen

-- | what was the test size
usedSize :: Result -> Int

-- | what was the reason
reason :: Result -> String

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String
NoExpectedFailure :: Int -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String

-- | isSuccess checks if the test run result was a success
isSuccess :: Result -> Bool

-- | stdArgs are the default test arguments used
stdArgs :: Args

-- | Tests a property and prints the results to <tt>stdout</tt>.
quickCheck :: Testable prop => prop -> IO ()

-- | Tests a property, using test arguments, and prints the results to
--   <tt>stdout</tt>.
quickCheckWith :: Testable prop => Args -> prop -> IO ()

-- | Tests a property, produces a test result, and prints the results to
--   <tt>stdout</tt>.
quickCheckResult :: Testable prop => prop -> IO Result

-- | Tests a property, using test arguments, produces a test result, and
--   prints the results to <tt>stdout</tt>.
quickCheckWithResult :: Testable prop => Args -> prop -> IO Result

-- | Tests a property and prints the results and all test cases generated
--   to <tt>stdout</tt>. This is just a convenience function that means the
--   same as <a>quickCheck</a> <a>.</a> <a>verbose</a>.
verboseCheck :: Testable prop => prop -> IO ()

-- | Tests a property, using test arguments, and prints the results and all
--   test cases generated to <tt>stdout</tt>. This is just a convenience
--   function that combines <a>quickCheckWith</a> and <a>verbose</a>.
verboseCheckWith :: Testable prop => Args -> prop -> IO ()

-- | Tests a property, produces a test result, and prints the results and
--   all test cases generated to <tt>stdout</tt>. This is just a
--   convenience function that combines <a>quickCheckResult</a> and
--   <a>verbose</a>.
verboseCheckResult :: Testable prop => prop -> IO Result

-- | Tests a property, using test arguments, produces a test result, and
--   prints the results and all test cases generated to <tt>stdout</tt>.
--   This is just a convenience function that combines
--   <a>quickCheckWithResult</a> and <a>verbose</a>.
verboseCheckWithResult :: Testable prop => Args -> prop -> IO Result
test :: State -> (StdGen -> Int -> Prop) -> IO Result
doneTesting :: State -> (StdGen -> Int -> Prop) -> IO Result
giveUp :: State -> (StdGen -> Int -> Prop) -> IO Result
runATest :: State -> (StdGen -> Int -> Prop) -> IO Result
summary :: State -> [(String, Int)]
success :: State -> IO ()
foundFailure :: State -> Result -> [Rose Result] -> IO Int
localMin :: State -> Result -> [Rose Result] -> IO Int
localMin' :: State -> Result -> [Rose Result] -> IO Int
localMinFound :: State -> Result -> IO Int
callbackPostTest :: State -> Result -> IO ()
callbackPostFinalFailure :: State -> Result -> IO ()
safely :: State -> IO () -> IO ()
instance Show Args
instance Read Args
instance Show Result
instance Read Result


-- | Allows testing of monadic values. See the paper "Testing Monadic Code
--   with QuickCheck":
--   <a>http://www.cse.chalmers.se/~rjmh/Papers/QuickCheckST.ps</a>.
module Test.QuickCheck.Monadic
newtype PropertyM m a
MkPropertyM :: ((a -> Gen (m Property)) -> Gen (m Property)) -> PropertyM m a
unPropertyM :: PropertyM m a -> (a -> Gen (m Property)) -> Gen (m Property)
stop :: (Testable prop, Monad m) => prop -> PropertyM m a
assert :: Monad m => Bool -> PropertyM m ()
pre :: Monad m => Bool -> PropertyM m ()
run :: Monad m => m a -> PropertyM m a
pick :: (Monad m, Show a) => Gen a -> PropertyM m a
wp :: Monad m => m a -> (a -> PropertyM m b) -> PropertyM m b
forAllM :: (Monad m, Show a) => Gen a -> (a -> PropertyM m b) -> PropertyM m b
monitor :: Monad m => (Property -> Property) -> PropertyM m ()
monadic :: Monad m => (m Property -> Property) -> PropertyM m a -> Property
monadic' :: Monad m => PropertyM m a -> Gen (m Property)
monadicIO :: PropertyM IO a -> Property
monadicST :: (forall s. PropertyM (ST s) a) -> Property
runSTGen :: (forall s. Gen (ST s a)) -> Gen a
instance Monad m => Monad (PropertyM m)
instance Functor (PropertyM m)


-- | Experimental features using Template Haskell. You need to have a
--   <tt>{-# LANGUAGE TemplateHaskell #-}</tt> pragma in your module for
--   any of these to work.
module Test.QuickCheck.All

-- | Test all properties in the current module. The name of the property
--   must begin with <tt>prop_</tt>. Polymorphic properties will be
--   defaulted to <a>Integer</a>. Returns <a>True</a> if all tests
--   succeeded, <a>False</a> otherwise.
--   
--   Using <a>quickCheckAll</a> interactively doesn't work. Instead, add a
--   definition to your module along the lines of
--   
--   <pre>
--   runTests = $quickCheckAll
--   </pre>
--   
--   and then execute <tt>runTests</tt>.
quickCheckAll :: Q Exp

-- | Test all properties in the current module. This is just a convenience
--   function that combines <a>quickCheckAll</a> and <a>verbose</a>.
verboseCheckAll :: Q Exp

-- | Test all properties in the current module, using a custom
--   <a>quickCheck</a> function. The same caveats as with
--   <a>quickCheckAll</a> apply.
--   
--   <tt>$<a>forAllProperties</a></tt> has type <tt>(<a>Property</a> -&gt;
--   <a>IO</a> <a>Result</a>) -&gt; <a>IO</a> <a>Bool</a></tt>. An example
--   invocation is <tt>$<a>forAllProperties</a>
--   <a>quickCheckResult</a></tt>, which does the same thing as
--   <tt>$<a>quickCheckAll</a></tt>.
forAllProperties :: Q Exp

-- | Test a polymorphic property, defaulting all type variables to
--   <a>Integer</a>.
--   
--   Invoke as <tt>$(<a>polyQuickCheck</a> 'prop)</tt>, where <tt>prop</tt>
--   is a property. Note that just evaluating <tt><a>quickCheck</a>
--   prop</tt> in GHCi will seem to work, but will silently default all
--   type variables to <tt>()</tt>!
polyQuickCheck :: Name -> ExpQ

-- | Test a polymorphic property, defaulting all type variables to
--   <a>Integer</a>. This is just a convenience function that combines
--   <a>polyQuickCheck</a> and <a>verbose</a>.
polyVerboseCheck :: Name -> ExpQ

-- | Monomorphise an arbitrary name by defaulting all type variables to
--   <a>Integer</a>.
--   
--   For example, if <tt>f</tt> has type <tt><a>Ord</a> a =&gt; [a] -&gt;
--   [a]</tt> then <tt>$(<a>mono</a> 'f)</tt> has type <tt>[<a>Integer</a>]
--   -&gt; [<a>Integer</a>]</tt>.
mono :: Name -> ExpQ

module Test.QuickCheck

-- | Tests a property and prints the results to <tt>stdout</tt>.
quickCheck :: Testable prop => prop -> IO ()

-- | Args specifies arguments to the QuickCheck driver
data Args
Args :: Maybe (StdGen, Int) -> Int -> Int -> Int -> Bool -> Args

-- | should we replay a previous test?
replay :: Args -> Maybe (StdGen, Int)

-- | maximum number of successful tests before succeeding
maxSuccess :: Args -> Int

-- | maximum number of discarded tests before giving up
maxDiscard :: Args -> Int

-- | size to use for the biggest test cases
maxSize :: Args -> Int

-- | whether to print anything
chatty :: Args -> Bool

-- | Result represents the test result
data Result
Success :: Int -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String
GaveUp :: Int -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String
Failure :: Int -> Int -> StdGen -> Int -> String -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | number of successful shrinking steps performed
numShrinks :: Result -> Int

-- | what seed was used
usedSeed :: Result -> StdGen

-- | what was the test size
usedSize :: Result -> Int

-- | what was the reason
reason :: Result -> String

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String
NoExpectedFailure :: Int -> [(String, Int)] -> String -> Result

-- | number of tests performed
--   
--   number of tests performed
--   
--   number of successful tests performed
--   
--   number of successful tests performed
numTests :: Result -> Int

-- | labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all successful tests
--   
--   labels and frequencies found during all tests
--   
--   labels and frequencies found during all tests
labels :: Result -> [(String, Int)]

-- | printed output
--   
--   printed output
--   
--   printed output
--   
--   printed output
output :: Result -> String

-- | stdArgs are the default test arguments used
stdArgs :: Args

-- | Tests a property, using test arguments, and prints the results to
--   <tt>stdout</tt>.
quickCheckWith :: Testable prop => Args -> prop -> IO ()

-- | Tests a property, using test arguments, produces a test result, and
--   prints the results to <tt>stdout</tt>.
quickCheckWithResult :: Testable prop => Args -> prop -> IO Result

-- | Tests a property, produces a test result, and prints the results to
--   <tt>stdout</tt>.
quickCheckResult :: Testable prop => prop -> IO Result

-- | Tests a property and prints the results and all test cases generated
--   to <tt>stdout</tt>. This is just a convenience function that means the
--   same as <a>quickCheck</a> <a>.</a> <a>verbose</a>.
verboseCheck :: Testable prop => prop -> IO ()

-- | Tests a property, using test arguments, and prints the results and all
--   test cases generated to <tt>stdout</tt>. This is just a convenience
--   function that combines <a>quickCheckWith</a> and <a>verbose</a>.
verboseCheckWith :: Testable prop => Args -> prop -> IO ()

-- | Tests a property, using test arguments, produces a test result, and
--   prints the results and all test cases generated to <tt>stdout</tt>.
--   This is just a convenience function that combines
--   <a>quickCheckWithResult</a> and <a>verbose</a>.
verboseCheckWithResult :: Testable prop => Args -> prop -> IO Result

-- | Tests a property, produces a test result, and prints the results and
--   all test cases generated to <tt>stdout</tt>. This is just a
--   convenience function that combines <a>quickCheckResult</a> and
--   <a>verbose</a>.
verboseCheckResult :: Testable prop => prop -> IO Result

-- | Prints out the generated testcase every time the property is tested,
--   like <tt>verboseCheck</tt> from QuickCheck 1. Only variables
--   quantified over <i>inside</i> the <a>verbose</a> are printed.
verbose :: Testable prop => prop -> Property
data Gen a

-- | Used to construct generators that depend on the size parameter.
sized :: (Int -> Gen a) -> Gen a

-- | Overrides the size parameter. Returns a generator which uses the given
--   size instead of the runtime-size parameter.
resize :: Int -> Gen a -> Gen a

-- | Generates a random element in the given inclusive range.
choose :: Random a => (a, a) -> Gen a

-- | Promotes a monadic generator to a generator of monadic values.
promote :: Monad m => m (Gen a) -> Gen (m a)

-- | Generates a value that satisfies a predicate.
suchThat :: Gen a -> (a -> Bool) -> Gen a

-- | Tries to generate a value that satisfies a predicate.
suchThatMaybe :: Gen a -> (a -> Bool) -> Gen (Maybe a)

-- | Randomly uses one of the given generators. The input list must be
--   non-empty.
oneof :: [Gen a] -> Gen a

-- | Chooses one of the given generators, with a weighted random
--   distribution. The input list must be non-empty.
frequency :: [(Int, Gen a)] -> Gen a

-- | Generates one of the given values. The input list must be non-empty.
elements :: [a] -> Gen a

-- | Takes a list of elements of increasing size, and chooses among an
--   initial segment of the list. The size of this initial segment
--   increases with the size parameter. The input list must be non-empty.
growingElements :: [a] -> Gen a

-- | Generates a list of random length. The maximum length depends on the
--   size parameter.
listOf :: Gen a -> Gen [a]

-- | Generates a non-empty list of random length. The maximum length
--   depends on the size parameter.
listOf1 :: Gen a -> Gen [a]

-- | Generates a list of the given length.
vectorOf :: Int -> Gen a -> Gen [a]

-- | Generates a list of a given length.
vector :: Arbitrary a => Int -> Gen [a]

-- | Generates an ordered list of a given length.
orderedList :: (Ord a, Arbitrary a) => Gen [a]

-- | Generates some example values and prints them to <tt>stdout</tt>.
sample :: Show a => Gen a -> IO ()

-- | Generates some example values.
sample' :: Gen a -> IO [a]

-- | Random generation and shrinking of values.
class Arbitrary a where arbitrary = error "no default generator" shrink _ = []
arbitrary :: Arbitrary a => Gen a
shrink :: Arbitrary a => a -> [a]

-- | Used for random generation of functions.
class CoArbitrary a
coarbitrary :: CoArbitrary a => a -> Gen c -> Gen c

-- | Generates an integral number. The number can be positive or negative
--   and its maximum absolute value depends on the size parameter.
arbitrarySizedIntegral :: Num a => Gen a

-- | Generates a fractional number. The number can be positive or negative
--   and its maximum absolute value depends on the size parameter.
arbitrarySizedFractional :: Fractional a => Gen a

-- | Generates an integral number from a bounded domain. The number is
--   chosen from the entire range of the type, but small numbers are
--   generated more often than big numbers. Inspired by demands from Phil
--   Wadler.
arbitrarySizedBoundedIntegral :: (Bounded a, Integral a) => Gen a

-- | Generates an integral number. The number is chosen uniformly from the
--   entire range of the type. You may want to use
--   <a>arbitrarySizedBoundedIntegral</a> instead.
arbitraryBoundedIntegral :: (Bounded a, Integral a) => Gen a

-- | Generates an element of a bounded type. The element is chosen from the
--   entire range of the type.
arbitraryBoundedRandom :: (Bounded a, Random a) => Gen a

-- | Returns no shrinking alternatives.
shrinkNothing :: a -> [a]

-- | Shrink an integral number.
shrinkIntegral :: Integral a => a -> [a]

-- | Shrink a fraction.
shrinkRealFrac :: RealFrac a => a -> [a]

-- | Modifies a generator using an integer seed.
variant :: Integral n => n -> Gen a -> Gen a

-- | Combine two generator perturbing functions, for example the results of
--   calls to <a>variant</a> or <a>coarbitrary</a>.
(><) :: (Gen a -> Gen a) -> (Gen a -> Gen a) -> (Gen a -> Gen a)

-- | A <a>coarbitrary</a> implementation for integral numbers.
coarbitraryIntegral :: Integral a => a -> Gen b -> Gen b

-- | A <a>coarbitrary</a> implementation for real numbers.
coarbitraryReal :: Real a => a -> Gen b -> Gen b

-- | <a>coarbitrary</a> helper for lazy people :-).
coarbitraryShow :: Show a => a -> Gen b -> Gen b

-- | <tt>Blind x</tt>: as x, but x does not have to be in the <a>Show</a>
--   class.
newtype Blind a
Blind :: a -> Blind a

-- | <tt>Fixed x</tt>: as x, but will not be shrunk.
newtype Fixed a
Fixed :: a -> Fixed a

-- | <tt>Ordered xs</tt>: guarantees that xs is ordered.
newtype OrderedList a
Ordered :: [a] -> OrderedList a

-- | <tt>NonEmpty xs</tt>: guarantees that xs is non-empty.
newtype NonEmptyList a
NonEmpty :: [a] -> NonEmptyList a

-- | <tt>Positive x</tt>: guarantees that <tt>x &gt; 0</tt>.
newtype Positive a
Positive :: a -> Positive a

-- | <tt>NonZero x</tt>: guarantees that <tt>x /= 0</tt>.
newtype NonZero a
NonZero :: a -> NonZero a

-- | <tt>NonNegative x</tt>: guarantees that <tt>x &gt;= 0</tt>.
newtype NonNegative a
NonNegative :: a -> NonNegative a

-- | <tt>Smart _ x</tt>: tries a different order when shrinking.
data Smart a
Smart :: Int -> a -> Smart a

-- | <tt>Shrink2 x</tt>: allows 2 shrinking steps at the same time when
--   shrinking x
newtype Shrink2 a
Shrink2 :: a -> Shrink2 a

-- | <tt>Shrinking _ x</tt>: allows for maintaining a state during
--   shrinking.
data Shrinking s a
Shrinking :: s -> a -> Shrinking s a
class ShrinkState s a
shrinkInit :: ShrinkState s a => a -> s
shrinkState :: ShrinkState s a => a -> s -> [(a, s)]
type Property = Gen Prop
data Prop

-- | The class of things which can be tested, i.e. turned into a property.
class Testable prop
property :: Testable prop => prop -> Property

-- | Changes the maximum test case size for a property.
mapSize :: Testable prop => (Int -> Int) -> prop -> Property

-- | Shrinks the argument to property if it fails. Shrinking is done
--   automatically for most types. This is only needed when you want to
--   override the default behavior.
shrinking :: Testable prop => (a -> [a]) -> a -> (a -> prop) -> Property

-- | Implication for properties: The resulting property holds if the first
--   argument is <a>False</a>, or if the given property holds.
(==>) :: Testable prop => Bool -> prop -> Property

-- | Explicit universal quantification: uses an explicitly given test case
--   generator.
forAll :: (Show a, Testable prop) => Gen a -> (a -> prop) -> Property

-- | Like <a>forAll</a>, but tries to shrink the argument for failing test
--   cases.
forAllShrink :: (Show a, Testable prop) => Gen a -> (a -> [a]) -> (a -> prop) -> Property

-- | Nondeterministic choice: <tt>p1</tt> <a>.&amp;.</a> <tt>p2</tt> picks
--   randomly one of <tt>p1</tt> and <tt>p2</tt> to test. If you test the
--   property 100 times it makes 100 random choices.
(.&.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

-- | Conjunction: <tt>p1</tt> <a>.&amp;&amp;.</a> <tt>p2</tt> passes if
--   both <tt>p1</tt> and <tt>p2</tt> pass.
(.&&.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

-- | Take the conjunction of several properties.
conjoin :: Testable prop => [prop] -> Property

-- | Disjunction: <tt>p1</tt> <a>.||.</a> <tt>p2</tt> passes unless
--   <tt>p1</tt> and <tt>p2</tt> simultaneously fail.
(.||.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

-- | Take the disjunction of several properties.
disjoin :: Testable prop => [prop] -> Property

-- | Performs an <a>IO</a> action after the last failure of a property.
whenFail :: Testable prop => IO () -> prop -> Property

-- | Prints a message to the terminal as part of the counterexample.
printTestCase :: Testable prop => String -> prop -> Property

-- | Performs an <a>IO</a> action every time a property fails. Thus, if
--   shrinking is done, this can be used to keep track of the failures
--   along the way.
whenFail' :: Testable prop => IO () -> prop -> Property

-- | Modifies a property so that it is expected to fail for some test
--   cases.
expectFailure :: Testable prop => prop -> Property

-- | Considers a property failed if it does not complete within the given
--   number of microseconds.
within :: Testable prop => Int -> prop -> Property

-- | Attaches a label to a property. This is used for reporting test case
--   distribution.
label :: Testable prop => String -> prop -> Property

-- | Labels a property with a value:
--   
--   <pre>
--   collect x = label (show x)
--   </pre>
collect :: (Show a, Testable prop) => a -> prop -> Property

-- | Conditionally labels test case.
classify :: Testable prop => Bool -> String -> prop -> Property

-- | Checks that at least the given proportion of the test cases belong to
--   the given class.
cover :: Testable prop => Bool -> Int -> String -> prop -> Property
newtype Str
MkStr :: String -> Str
ranges :: (Show a, Integral a) => a -> a -> Str