{-# LANGUAGE PackageImports #-}
module Xanthous.Generators.UtilSpec (main, test) where
import Test.Prelude
import System.Random (mkStdGen)
import Control.Monad.Random (runRandT)
import Data.Array.ST (STUArray, runSTUArray, thaw)
import Data.Array.IArray (bounds)
import Data.Array.MArray (newArray, readArray, writeArray)
import Data.Array (Array, range, listArray, Ix)
import Control.Monad.ST (ST, runST)
import "checkers" Test.QuickCheck.Instances.Array ()
import Xanthous.Util
import Xanthous.Data (width, height)
import Xanthous.Generators.Util
main :: IO ()
main = defaultMain test
newtype GenArray a b = GenArray (Array a b)
deriving stock (Show, Eq)
instance (Ix a, Arbitrary a, CoArbitrary a, Arbitrary b) => Arbitrary (GenArray a b) where
arbitrary = GenArray <$> do
(mkElem :: a -> b) <- arbitrary
minDims <- arbitrary
maxDims <- arbitrary
let bnds = (minDims, maxDims)
pure $ listArray bnds $ mkElem <$> range bnds
test :: TestTree
test = testGroup "Xanthous.Generators.Util"
[ testGroup "randInitialize"
[ testProperty "returns an array of the correct dimensions" $ \dims seed aliveChance ->
let gen = mkStdGen seed
res = runSTUArray
$ fmap fst
$ flip runRandT gen
$ randInitialize dims aliveChance
in bounds res === ((0, 0), (dims ^. width, dims ^. height))
]
, testGroup "numAliveNeighbors"
[ testProperty "maxes out at 8" $ \(GenArray (arr :: Array (Word, Word) Bool)) loc ->
let
act :: forall s. ST s Word
act = do
mArr <- thaw @_ @_ @_ @(STUArray s) arr
numAliveNeighborsM mArr loc
res = runST act
in counterexample (show res) $ between 0 8 res
]
, testGroup "cloneMArray"
[ testCase "clones the array" $ runST $
let
go :: forall s. ST s Assertion
go = do
arr <- newArray @(STUArray s) (0 :: Int, 5) (1 :: Int)
arr' <- cloneMArray @_ @(STUArray s) arr
writeArray arr' 0 1234
x <- readArray arr 0
pure $ x @?= 1
in go
]
]
