2016-07-26 20:11:52 +03:00
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{-# LANGUAGE RankNTypes, ScopedTypeVariables #-}
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2016-07-26 10:56:52 +03:00
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module Data.Mergeable.Spec where
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2016-07-26 10:58:14 +03:00
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2016-07-26 11:02:52 +03:00
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import Data.Functor.Identity
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import Data.Mergeable
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2016-07-26 10:58:14 +03:00
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import Prologue
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2016-07-26 12:39:02 +03:00
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import Syntax
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2016-07-26 10:58:14 +03:00
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import Test.Hspec
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import Test.Hspec.QuickCheck
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2016-07-26 11:06:51 +03:00
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import Test.QuickCheck
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2016-07-26 10:58:14 +03:00
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spec :: Spec
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2016-07-26 19:47:38 +03:00
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spec = parallel $ do
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2016-07-26 20:06:18 +03:00
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describe "[]" $ do
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2016-07-26 20:11:52 +03:00
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withAlternativeInstances sequenceAltLaws (arbitrary :: Gen [Char])
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withAlternativeInstances mergeLaws (arbitrary :: Gen [Char])
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2016-07-26 20:16:46 +03:00
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describe "Maybe" $ do
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withAlternativeInstances sequenceAltLaws (arbitrary :: Gen (Maybe Char))
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withAlternativeInstances mergeLaws (arbitrary :: Gen (Maybe Char))
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2016-07-26 20:17:13 +03:00
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describe "Identity" $ do
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withAlternativeInstances sequenceAltLaws (Identity <$> arbitrary :: Gen (Identity Char))
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withAlternativeInstances mergeLaws (Identity <$> arbitrary :: Gen (Identity Char))
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2016-07-26 20:17:33 +03:00
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describe "Syntax" $ do
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withAlternativeInstances sequenceAltLaws (sized (syntaxOfSize (const arbitrary)) :: Gen (Syntax Char Char))
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withAlternativeInstances mergeLaws (sized (syntaxOfSize (const arbitrary)) :: Gen (Syntax Char Char))
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2016-07-26 11:04:24 +03:00
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2016-07-26 20:11:52 +03:00
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mergeLaws :: forall f g a. (Mergeable f, Alternative g, Eq (g (f a)), Show (f a), Show (g (f a))) => Gen (f a) -> Gen (Blind (a -> g a)) -> Spec
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2016-07-26 20:03:13 +03:00
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mergeLaws value function = describe "merge" $ do
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prop "relationship with sequenceAlt" . forAll ((,) <$> value <*> function) $
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\ (a, f) -> merge (getBlind f) a `shouldBe` sequenceAlt (fmap (getBlind f) a)
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2016-07-26 20:13:45 +03:00
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sequenceAltLaws :: forall f g a. (Mergeable f, Alternative g, Eq (g (f a)), Show (f a), Show (g (f a))) => Gen (f a) -> Gen (Blind (a -> g a)) -> Spec
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sequenceAltLaws value function = do
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describe "sequenceAlt" $ do
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prop "identity" . forAll value $
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\ a -> sequenceAlt (pure <$> a) `shouldBe` (pure a :: g (f a))
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2016-07-26 11:15:56 +03:00
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2016-07-26 20:25:16 +03:00
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prop "relationship with merge" . forAll (Blind <$> (fmap . getBlind <$> function <*> value) :: Gen (Blind (f (g a)))) $
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2016-07-26 20:23:14 +03:00
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\ a -> sequenceAlt (getBlind a) `shouldBe` merge identity (getBlind a)
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2016-07-26 20:12:09 +03:00
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2016-07-26 20:12:32 +03:00
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withAlternativeInstances :: forall f a. (Arbitrary a, CoArbitrary a, Eq (f a), Show (f a)) => (forall g. (Alternative g, Eq (g (f a)), Show (g (f a))) => Gen (f a) -> Gen (Blind (a -> g a)) -> Spec) -> Gen (f a) -> Spec
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2016-07-26 20:12:09 +03:00
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withAlternativeInstances laws gen = do
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describe "Maybe" $ laws gen (arbitrary :: Gen (Blind (a -> Maybe a)))
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