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{-# LANGUAGE ScopedTypeVariables #-}
import Test.QuickCheck
import Test.Hspec
import Blessings
instance Arbitrary a => Arbitrary (Blessings a) where
arbitrary =
oneof
[ Plain <$> arbitrary
, pure Empty
, (<>) <$> arbitrary <*> arbitrary
, SGR <$> arbitrary <*> arbitrary
]
main :: IO ()
main =
hspec $ do
describe "Blessings" $ do
it "obeys the Semigroup laws" $
property $ \(x :: Blessings String) y z ->
(x <> y) <> z == x <> (y <> z)
it "obeys the Monoid laws" $
property $ \(x :: Blessings String) ->
x <> mempty == x && x == mempty <> x
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