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{-# LANGUAGE NoMonomorphismRestriction #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeFamilies #-}
module Control.NewtypeSpec where
import Prelude
import Data.Monoid
import Control.Newtype.Generics
import GHC.Generics
import Test.Hspec
newtype TestNewType = TestNewType Int deriving (Eq,Show,Generic)
instance Newtype TestNewType
{-# ANN spec ("HLint: ignore Redundant do"::String) #-}
spec :: Spec
spec = describe "Newtype test" $ do
let four = 4 :: Int
five = 5 :: Int
noth = Nothing :: Maybe String
it "pack" $ do
(pack True :: All) `shouldBe` All True
(pack True :: Any) `shouldBe` Any True
(pack (Just five) :: First Int) `shouldBe` First (Just 5)
it "unpack" $ do
unpack (Any False) `shouldBe` False
unpack (First (Just five)) `shouldBe` Just five
unpack (Last noth) `shouldBe` Nothing
unpack (TestNewType five) `shouldBe` five
it "op" $ do
op All (All True) `shouldBe` True
op Any (Any False) `shouldBe` False
op Sum (Sum five) `shouldBe` five
it "under" $ do
let sumLess (Sum x) = Sum (x - 1)
firstN (_) = First Nothing
under Sum sumLess five `shouldBe` four
under First firstN (Just five) `shouldBe` (Nothing :: Maybe Int)
it "over" $ do
over Sum (+1) (Sum four) `shouldBe` Sum five
over Product (+1) (Product four) `shouldBe` Product five
it "under2" $ do
under2 Sum (<>) four five `shouldBe` 9
it "over2" $ do
over2 TestNewType (+) (TestNewType four) (TestNewType five) `shouldBe` TestNewType 9
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