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20 lines
550 B
Haskell
20 lines
550 B
Haskell
module Data.Functor.Classes.Ord.Generic.Spec where
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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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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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