-- cf. Test.NumericPrelude.Utility
module Test.Utility where

import Data.List.HT (mapAdjacent, )
import qualified Data.List as List


-- compare the lists simultaneously
equalLists :: Eq a => [[a]] -> Bool
equalLists xs =
   let equalElems ys =
          and (mapAdjacent (==) ys)  &&  length xs == length ys
   in  all equalElems (List.transpose xs)

equalInfLists :: Eq a => Int -> [[a]] -> Bool
equalInfLists n xs = equalLists (map (take n) xs)