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|
{-# LANGUAGE TemplateHaskell #-}
module Main where
import Control.Monad
import Data.Bits
import qualified Data.ByteString as BS
import qualified Data.Text as T
import Data.Text.Encoding
import System.Exit
import Test.QuickCheck
import Test.QuickCheck.Utf8
prop_decodes_without_exception :: Property
prop_decodes_without_exception = forAllAndShrinks utf8BS shrinkUtf8BS $ \bs ->
let t = decodeUtf8 bs in
(T.length t >=) 0 === True
prop_oneByte_lsb :: Property
prop_oneByte_lsb = forAll oneByte $ \bs ->
let b = head $ BS.unpack bs
in testBit b 7 === False
prop_oneByte_range :: Property
prop_oneByte_range = forAll oneByte $ \bs ->
let s = sum $ fmap fromIntegral $ BS.unpack bs
in (s >= 0 && s <= 127)
prop_twoByte_range :: Property
prop_twoByte_range = forAll twoByte $ \bs ->
let s = sum $ fmap fromIntegral $ BS.unpack bs
in (s >= 320 && s <= 65439)
prop_threeByte_range :: Property
prop_threeByte_range = forAll threeByte $ \bs ->
let s = sum $ fmap fromIntegral $ BS.unpack bs
in (s >= 480 && s <= 16777071)
prop_validUtf81_length :: Property
prop_validUtf81_length = forAllAndShrinks utf8BS1 shrinkUtf8BS1 $ \bs ->
BS.length bs >= 1
prop_validUtf81_valid :: Property
prop_validUtf81_valid = forAllAndShrinks utf8BS1 shrinkUtf8BS1 $ \bs ->
let t = decodeUtf8 bs in
(T.length t >= 1) === True
-- |
-- Ensure that the shrink applied to the generated value also satisfies the property.
forAllAndShrinks :: (Show a, Testable prop) => Gen a -> (a -> [a]) -> (a -> prop) -> Property
forAllAndShrinks gen shr prop =
forAll (gen >>= \x -> return (x : shr x)) $ \xs ->
conjoin $ fmap prop xs
return []
props :: IO Bool
props = $quickCheckAll
main :: IO ()
main = props >>= flip when exitFailure . not
|
