Test.StrongCheck.Perturb

newtype Attempts

Constructors

• Attempts Int

newtype Perturber a

Constructors

• Perturber (PerturberRec a)

Instances

• Invariant Perturber

type PerturberRec a = { dims :: a -> Number, dist :: a -> a -> Number, perturb :: Number -> a -> Gen a }

unPerturber :: forall a. Perturber a -> PerturberRec a

class Perturb a  where

The class for things which can be perturbed.

Laws: forall a, 0 >= n <= 1: ((>=) n) <<< dist a <$> (perturb n a) must be an infinite generator of true values.

Members

• perturber :: Perturber a

Instances

• (BoundedEnum a, Eq a) => Perturb (ArbBoundedEnum a)
• Perturb Number
• Perturb Int
• (Perturb a) => Perturb (List a)
• Perturb Char
• Perturb Boolean
• Perturb String

perturb :: forall a. Perturb a => Number -> a -> Gen a

dist :: forall a. Perturb a => a -> a -> Number

dims :: forall a. Perturb a => a -> Number

nonPerturber :: forall a. Perturber a

Creates a perturber that perturbs nothing.

searchIn' :: forall a. Perturb a => Attempts -> Int -> (a -> Boolean) -> a -> Gen a

Given one example, searches for other examples that satisfy a provided boolean predicate.

The search operates out-to-in, in an attempt to find examples that are as far removed from the provided example as possible. The sampling size parameter determines how many samples to take at every level of searching, while the attempts parameter determines how many levels.

searchIn :: forall a. Perturb a => (a -> Boolean) -> a -> Gen a

The same as search', but uses defaults for attempt count and sample size. Will search a total of 10,000 examples before giving up.

perturberProduct :: forall b a. Perturber a -> Perturber b -> Perturber (Tuple a b)

Combines two perturbers to produce a perturber of the product

Operator alias for Test.StrongCheck.Perturb.perturberProduct (right-associative / precedence 6)

perturberSum :: forall b a. Perturber a -> Perturber b -> Perturber (Either a b)

Combines two perturbers to produce a perturber of the sum

Operator alias for Test.StrongCheck.Perturb.perturberSum (right-associative / precedence 6)

bounded :: Number -> Number -> Perturber Number

Creates a perturber for numbers that fall within the specified range.

boundedInt :: Int -> Int -> Perturber Int

Creates a perturber for integers that fall within the specified range.

enumerated :: forall a. Eq a => a -> Array a -> Perturber a