Test.QuickCheck.Arbitrary

class Arbitrary t  where

The Arbitrary class represents those types whose values can be randomly-generated.

arbitrary uses the Gen monad to express a random generator for the type t. Combinators in the Test.QuickCheck.Gen module can be used to construct random generators.

Members

• arbitrary :: Gen t

Instances

• Arbitrary Boolean
• Arbitrary Number
• Arbitrary Int
• Arbitrary String
• Arbitrary NonEmptyString
• Arbitrary Char
• Arbitrary Unit
• Arbitrary Ordering
• (Arbitrary a) => Arbitrary (Array a)
• (Arbitrary a) => Arbitrary (NonEmptyArray a)
• (Coarbitrary a, Arbitrary b) => Arbitrary (a -> b)
• (Arbitrary a, Arbitrary b) => Arbitrary (Tuple a b)
• (Arbitrary a) => Arbitrary (Maybe a)
• (Arbitrary a, Arbitrary b) => Arbitrary (Either a b)
• (Arbitrary a) => Arbitrary (List a)
• (Arbitrary a) => Arbitrary (Identity a)
• (Arbitrary a) => Arbitrary (Lazy a)
• (Arbitrary (f a), Arbitrary a) => Arbitrary (NonEmpty f a)
• (Arbitrary a) => Arbitrary (NonEmptyList a)
• Arbitrary NoArguments
• (Arbitrary l, ArbitraryGenericSum r) => Arbitrary (Sum l r)
• (Arbitrary l, Arbitrary r) => Arbitrary (Product l r)
• (Arbitrary a) => Arbitrary (Constructor s a)
• (Arbitrary a) => Arbitrary (Argument a)
• (RowToList row list, ArbitraryRowList list row) => Arbitrary (Record row)

class Coarbitrary t  where

The Coarbitrary class represents types which appear on the left of an Arbitrary function arrow.

To construct an Arbitrary instance for the type a -> b, we need to use the input of type a to perturb a random generator for b. This is the role of the coarbitrary function.

Coarbitrary instances can be written using the perturbGen function.

Members

• coarbitrary :: forall r. t -> Gen r -> Gen r

Instances

• Coarbitrary Boolean
• Coarbitrary Number
• Coarbitrary Int
• Coarbitrary String
• Coarbitrary NonEmptyString
• Coarbitrary Char
• Coarbitrary Unit
• Coarbitrary Ordering
• (Coarbitrary a) => Coarbitrary (Array a)
• (Coarbitrary a) => Coarbitrary (NonEmptyArray a)
• (Arbitrary a, Coarbitrary b) => Coarbitrary (a -> b)
• (Coarbitrary a, Coarbitrary b) => Coarbitrary (Tuple a b)
• (Coarbitrary a) => Coarbitrary (Maybe a)
• (Coarbitrary a, Coarbitrary b) => Coarbitrary (Either a b)
• (Coarbitrary a) => Coarbitrary (List a)
• (Coarbitrary a) => Coarbitrary (Identity a)
• (Coarbitrary a) => Coarbitrary (Lazy a)
• (Coarbitrary (f a), Coarbitrary a) => Coarbitrary (NonEmpty f a)
• (Coarbitrary a) => Coarbitrary (NonEmptyList a)
• Coarbitrary NoArguments
• (Coarbitrary l, Coarbitrary r) => Coarbitrary (Sum l r)
• (Coarbitrary l, Coarbitrary r) => Coarbitrary (Product l r)
• (Coarbitrary a) => Coarbitrary (Constructor s a)
• (Coarbitrary a) => Coarbitrary (Argument a)

genericArbitrary :: forall rep a. Generic a rep => Arbitrary rep => Gen a

A Generic implementation of the arbitrary member from the Arbitrary type class.

genericCoarbitrary :: forall rep a. Generic a rep => Coarbitrary rep => a -> Gen a -> Gen a

A Generic implementation of the coarbitrary member from the Coarbitrary type class.

class ArbitraryGenericSum t  where

To be able to evenly distribute over chains of Sum types we build up a collection of generators and choose between. Each right component of a Sum is either a Constructor or another Sum.

Members

• arbitraryGenericSum :: Array (Gen t)

Instances

• (Arbitrary l, ArbitraryGenericSum r) => ArbitraryGenericSum (Sum l r)
• (Arbitrary a) => ArbitraryGenericSum (Constructor s a)

class ArbitraryRowList list row | list -> row where

A helper typeclass to implement Arbitrary for records.

Members

• arbitraryRecord :: RLProxy list -> Gen (Record row)

Instances

• ArbitraryRowList Nil ()
• (Arbitrary a, ArbitraryRowList listRest rowRest, Lacks key rowRest, Cons key a rowRest rowFull, RowToList rowFull (Cons key a listRest), IsSymbol key) => ArbitraryRowList (Cons key a listRest) rowFull