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45 lines
1.3 KiB
Haskell
45 lines
1.3 KiB
Haskell
module Data.Functor.Classes.Ord.Generic.Spec where
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import Data.Functor.Classes.Eq.Generic
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import Data.Functor.Classes.Ord.Generic
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import Data.Functor.Listable
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import GHC.Generics
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import Test.Hspec
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import Test.Hspec.LeanCheck
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spec :: Spec
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spec = parallel $ do
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describe "genericLiftCompare" $ do
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prop "equivalent to derived compare for product types" $
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\ a b -> genericLiftCompare compare a b `shouldBe` compare a (b :: Product Int)
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prop "equivalent to derived compare for sum types" $
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\ a b -> genericLiftCompare compare a b `shouldBe` compare a (b :: Sum Int)
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prop "equivalent to derived compare for recursive types" $
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\ a b -> genericLiftCompare compare a b `shouldBe` compare a (b :: Tree Int)
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data Product a = Product a a a
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deriving (Eq, Generic1, Ord, Show)
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instance Listable a => Listable (Product a) where
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tiers = cons3 Product
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data Sum a = Sum1 a | Sum2 a | Sum3 a
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deriving (Eq, Generic1, Ord, Show)
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instance Listable a => Listable (Sum a) where
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tiers = cons1 Sum1 \/ cons1 Sum2 \/ cons1 Sum3
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data Tree a = Leaf a | Branch [Tree a]
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deriving (Eq, Generic1, Ord, Show)
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instance Listable a => Listable (Tree a) where
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tiers = cons1 Leaf \/ cons1 Branch
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instance Eq1 Tree where liftEq = genericLiftEq
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instance Ord1 Tree where liftCompare = genericLiftCompare
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