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{-# LANGUAGE MultiWayIf #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module BaseSpec (spec) where
import Blessings
import Control.Exception
import Data.Sequences qualified as S
import System.IO.Unsafe
import System.Timeout
import Test.Hspec
import Test.QuickCheck
unsafeTimeout :: Int -> a -> a
unsafeTimeout n f =
case unsafePerformIO $ timeout n (evaluate f) of
Nothing -> error "timeout"
Just y -> y
instance Arbitrary a => Arbitrary (Blessings a) where
arbitrary =
oneof
[ Plain <$> arbitrary
, pure Empty
, (<>) <$> arbitrary <*> arbitrary
, SGR <$> arbitrary <*> arbitrary
]
spec :: Spec
spec =
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
it "splitAt produces pairs with elements of proper length" $
property $ \(i :: Int, x :: Blessings String) ->
unsafeTimeout 100000 $
let
(l, r) = S.splitAt i x
n = S.lengthIndex x
in
if | i <= 0 -> S.lengthIndex l == 0 && S.lengthIndex r == n
| i <= n -> S.lengthIndex l == i && S.lengthIndex r == n - i
| otherwise -> S.lengthIndex l == n && S.lengthIndex r == 0
let infx = mconcat (repeat (Plain "x" :: Blessings String))
it "can take from infinite structure" $
property $ \(n :: NonNegative Int) ->
unsafeTimeout 100000 $
let i = getNonNegative n in
S.lengthIndex (S.take i infx) == i
it "can drop from infinite structure" $
property $ \(n :: NonNegative Int) ->
unsafeTimeout 100000 $
let i = getNonNegative n in
S.lengthIndex (S.take i (S.drop i infx)) == i
it "can take concat of infinite structures" $
property $ \(x :: Blessings String) ->
unsafeTimeout 100000 $
S.lengthIndex (S.take 1 $ infx <> x) <= 1
|
