-- Copyright (c) 2014 Eric McCorkle.  All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
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-- 1. Redistributions of source code must retain the above copyright
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-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
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-- 3. Neither the name of the author nor the names of any contributors
--    may be used to endorse or promote products derived from this software
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-- THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS''
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module Tests.Data.Symbol(tests) where

import Control.Monad
import Data.Hashable
import Data.Symbol
import Test.HUnitPlus.Base

import qualified Data.HashSet as HashSet

instance Show Symbol where
  show = debugStr

symbolEnum :: [Symbol]
symbolEnum = take 1000 (iterate succ firstSym)

testNoDuplicates :: (Hashable a, Ord a) => [a] -> IO ()
testNoDuplicates =
  let
    foldfun accum val =
      do
        not (HashSet.member val accum) @? "Duplicate value"
        return (HashSet.insert val accum)
  in void . foldM foldfun HashSet.empty

testlist :: [Test]
testlist = [
    "succ_pred" ~: (firstSym @=? pred (succ firstSym)),
    "enum" ~: testNoDuplicates symbolEnum,
    "hash" ~: testNoDuplicates (map hash symbolEnum)
  ]

tests :: Test
tests = "Symbol" ~: testlist
