import StackSet
import System.Environment
import Control.Exception (assert)
import Control.Monad
import Test.QuickCheck
import System.IO
import System.Random
import Text.Printf
import Data.List (sort,group,sort,intersperse)
-- ---------------------------------------------------------------------
-- QuickCheck properties for the StackSet
-- | Height of stack 'n'
height :: Int -> StackSet a -> Int
height i w = case index w i of
Nothing -> error $ "height: i out of range: " ++ show i
Just ss -> length ss
-- build (non-empty) StackSets with between 1 and 100 stacks
instance (Ord a, Arbitrary a) => Arbitrary (StackSet a) where
arbitrary = do
sz <- choose (1,20)
n <- choose (0,sz-1)
ls <- vector sz
return $ fromList (n,ls)
coarbitrary = error "no coarbitrary for StackSet"
prop_id x = fromList (toList x) == x
where _ = x :: StackSet Int
prop_uniq_pushpop i x = not (member i x) ==>
(pop . push i) x == x
where _ = x :: StackSet Int
prop_pushpop i x =
(pop . push i) x == delete i x
where _ = x :: StackSet Int
-- popping an empty stack leaves an empty stack
prop_popempty x = height (cursor x) x == 0 ==> pop x == x
where _ = x :: StackSet Int
prop_popone x =
let l = height (cursor x) x
in l > 0 ==> height (cursor x) (pop x) == l-1
where _ = x :: StackSet Int
prop_delete_uniq i x = not (member i x) ==>
delete i x == x
where _ = x :: StackSet Int
prop_delete2 i x =
delete i x == delete i (delete i x)
where _ = x :: StackSet Int
prop_uniq_insertdelete i n x = not (member i x) ==>
delete i (insert i n x) == x
where _ = x :: StackSet Int
prop_insertdelete i n x =
delete i (insert i n x) == delete i x
where _ = x :: StackSet Int
prop_rotaterotate x = rotate LT (rotate GT x) == x
where _ = x :: StackSet Int
prop_viewview r x =
let n = cursor x
sz = size x
i = r `mod` sz
in
view n (view i x) == x
where _ = x :: StackSet Int
prop_shiftshift r x =
let n = cursor x
in
shift n (shift r x) == x
where _ = x :: StackSet Int
------------------------------------------------------------------------
main :: IO ()
main = do
args <- getArgs
let n = if null args then 100 else read (head args)
mapM_ (\(s,a) -> printf "%-25s: " s >> a n) tests
where
n = 100
tests =
[("fromList.toList ", mytest prop_id)
,("pop/push ", mytest prop_uniq_pushpop)
,("pop/push/delete ", mytest prop_pushpop)
,("pop/empty ", mytest prop_popempty)
,("delete/not.member", mytest prop_delete_uniq)
,("delete idempotent", mytest prop_delete2)
,("delete/insert new", mytest prop_uniq_insertdelete)
,("delete/insert ", mytest prop_insertdelete)
,("rotate/rotate ", mytest prop_rotaterotate)
,("pop one ", mytest prop_popone)
,("view/view ", mytest prop_viewview)
]
debug = False
mytest :: Testable a => a -> Int -> IO ()
mytest a n = mycheck defaultConfig
{ configMaxTest=n
, configEvery= \n args -> if debug then show n ++ ":\n" ++ unlines args else [] } a
mycheck :: Testable a => Config -> a -> IO ()
mycheck config a = do
rnd <- newStdGen
mytests config (evaluate a) rnd 0 0 []
mytests :: Config -> Gen Result -> StdGen -> Int -> Int -> [[String]] -> IO ()
mytests config gen rnd0 ntest nfail stamps
| ntest == configMaxTest config = do done "OK," ntest stamps
| nfail == configMaxFail config = do done "Arguments exhausted after" ntest stamps
| otherwise =
do putStr (configEvery config ntest (arguments result)) >> hFlush stdout
case ok result of
Nothing ->
mytests config gen rnd1 ntest (nfail+1) stamps
Just True ->
mytests config gen rnd1 (ntest+1) nfail (stamp result:stamps)
Just False ->
putStr ( "Falsifiable after "
++ show ntest
++ " tests:\n"
++ unlines (arguments result)
) >> hFlush stdout
where
result = generate (configSize config ntest) rnd2 gen
(rnd1,rnd2) = split rnd0
done :: String -> Int -> [[String]] -> IO ()
done mesg ntest stamps = putStr ( mesg ++ " " ++ show ntest ++ " tests" ++ table )
where
table = display
. map entry
. reverse
. sort
. map pairLength
. group
. sort
. filter (not . null)
$ stamps
display [] = ".\n"
display [x] = " (" ++ x ++ ").\n"
display xs = ".\n" ++ unlines (map (++ ".") xs)
pairLength xss@(xs:_) = (length xss, xs)
entry (n, xs) = percentage n ntest
++ " "
++ concat (intersperse ", " xs)
percentage n m = show ((100 * n) `div` m) ++ "%"
------------------------------------------------------------------------
