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Test that genericLiftCompare gives equivalent behaviour to compare for recursive types.

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Rob Rix 2017-10-03 09:29:06 -04:00
parent 5a024b40f7
commit ac3646f925
1 changed files with 13 additions and 0 deletions
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test/Data/Functor/Classes/Ord/Generic/Spec.hs
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@ -1,5 +1,6 @@
module Data.Functor.Classes.Ord.Generic.Spec where
import Data.Functor.Classes.Eq.Generic
import Data.Functor.Classes.Ord.Generic
import Data.Functor.Listable
import GHC.Generics
@ -15,6 +16,9 @@ spec = parallel $ do
prop "equivalent to derived compare for sum types" $
\ a b -> genericLiftCompare compare a b `shouldBe` compare a (b :: Sum Int)
prop "equivalent to derived compare for recursive types" $
\ a b -> genericLiftCompare compare a b `shouldBe` compare a (b :: Tree Int)
data Product a = Product a a a
deriving (Eq, Generic1, Ord, Show)
@ -27,3 +31,12 @@ data Sum a = Sum1 a | Sum2 a | Sum3 a
instance Listable a => Listable (Sum a) where
tiers = cons1 Sum1 \/ cons1 Sum2 \/ cons1 Sum3
data Tree a = Leaf a | Branch [Tree a]
deriving (Eq, Generic1, Ord, Show)
instance Listable a => Listable (Tree a) where
tiers = cons1 Leaf \/ cons1 Branch
instance Eq1 Tree where liftEq = genericLiftEq
instance Ord1 Tree where liftCompare = genericLiftCompare