Clone

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{-# LANGUAGE NoImplicitPrelude #-}
module Clone (
  clone, _test_clone, main_clone
) where

import Testing
import Functions
import Flip

clone :: (a -> a -> b) -> a -> b
clone f a = f a a

_test_clone_flip
  :: (Equal b)
  => a -> b
  -> Test ((a -> a -> b) -> a -> Bool)
_test_clone_flip _ _ =
  testName "clone(flip(f)) == clone(f)" $
  \f a -> eq (clone (flip f) a) (clone f a)

_test_clone_const
  :: (Equal a) => a -> Test (a -> Bool)
_test_clone_const _ =
  testName "clone(const)(x) == x" $
  \x -> eq (clone const x) x

clone3 :: (a -> a -> a -> b) -> a -> b
clone3 = compose clone (compose clone)

_test_clone3
  :: (Equal b)
  => a -> b
  -> Test ((a -> a -> a -> b) -> a -> Bool)
_test_clone3 _ _ =
  testName "clone3(f)(x) == f(x)(x)(x)" $
  \f a -> eq (clone3 f a) (f a a a)

_test_clone ::
  ( Equal a, Show a, Arbitrary a, CoArbitrary a
  , Equal b, Show b, Arbitrary b, CoArbitrary b
  ) => Int -> Int -> a -> b -> IO ()
_test_clone size cases a b = do
  testLabel0 "clone"
  let args = testArgs size cases

  runTest args (_test_clone_flip a b)
  runTest args (_test_clone_const a)
  runTest args (_test_clone3 a b)

main_clone :: IO ()
main_clone = do
  _test_clone 1 1 () ()