phi

module Test.Control.Monad.Writer where

import Test.QuickCheck (TestGroup(..), TestResult, quickCheck1)
import Prelude (IO, discard, pure, (==))
import Control.Monad.Writer (Writer, runWriter, tell)

testTell :: Writer String Integer
testTell = do
  tell "x"
  tell "y"
  pure 1

test :: TestGroup (Integer -> IO TestResult)
test = Exe [
  quickCheck1 "tell" (runWriter testTell == (1, "xy"))
]