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{-# LANGUAGE DeriveDataTypeable, OverloadedStrings, RecordWildCards,
ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
import Control.Monad
import Control.Applicative
import Data.Aeson.Encode
import Data.Aeson.Parser (value)
import Data.Aeson.Types
import Data.Attoparsec.Number
import Data.Data (Typeable, Data)
import Data.Text (Text)
import Test.Framework (Test, defaultMain, testGroup)
import Test.Framework.Providers.QuickCheck2 (testProperty)
import Test.QuickCheck (Arbitrary(..))
import qualified Data.Aeson.Generic as G
import qualified Data.Attoparsec.Lazy as L
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Text as T
import qualified Data.Map as Map
encodeDouble :: Double -> Double -> Bool
encodeDouble num denom
| isInfinite d || isNaN d = encode (Number (D d)) == "null"
| otherwise = (read . L.unpack . encode . Number . D) d == d
where d = num / denom
encodeInteger :: Integer -> Bool
encodeInteger i = encode (Number (I i)) == L.pack (show i)
roundTrip :: (FromJSON a, ToJSON a) => (a -> a -> Bool) -> a -> a -> Bool
roundTrip eq _ i =
case fmap fromJSON . L.parse value . encode . toJSON $ i of
L.Done _ (Success v) -> v `eq` i
_ -> False
roundTripEq :: (Eq a, FromJSON a, ToJSON a) => a -> a -> Bool
roundTripEq x y = roundTrip (==) x y
genericTo :: (Data a, ToJSON a) => a -> a -> Bool
genericTo _ v = G.toJSON v == toJSON v
genericFrom :: (Eq a, Data a, ToJSON a) => a -> a -> Bool
genericFrom _ v = G.fromJSON (toJSON v) == Success v
approxEq :: Double -> Double -> Bool
approxEq a b = a == b ||
d < maxAbsoluteError ||
d / max (abs b) (abs a) <= maxRelativeError
where d = abs (a - b)
maxAbsoluteError = 1e-15
maxRelativeError = 1e-15
toFromJSON :: (Arbitrary a, Eq a, FromJSON a, ToJSON a) => a -> Bool
toFromJSON x = case fromJSON . toJSON $ x of
Error _ -> False
Success x' -> x == x'
genericToFromJSON :: (Arbitrary a, Eq a, Data a) => a -> Bool
genericToFromJSON x = case G.fromJSON . G.toJSON $ x of
Error _ -> False
Success x' -> x == x'
data Foo = Foo {
fooInt :: Int
, fooDouble :: Double
, fooTuple :: (String, Text, Int)
-- This definition causes an infinite loop in genericTo and genericFrom!
-- , fooMap :: Map.Map String Foo
, fooMap :: Map.Map String (Text,Int)
} deriving (Show, Typeable, Data)
instance Eq Foo where
a == b = fooInt a == fooInt b &&
fooDouble a `approxEq` fooDouble b &&
fooTuple a == fooTuple b
instance ToJSON Foo where
toJSON Foo{..} = object [ "fooInt" .= fooInt
, "fooDouble" .= fooDouble
, "fooTuple" .= fooTuple
, "fooMap" .= fooMap
]
instance FromJSON Foo where
parseJSON (Object v) = Foo <$>
v .: "fooInt" <*>
v .: "fooDouble" <*>
v .: "fooTuple" <*>
v .: "fooMap"
parseJSON _ = empty
instance Arbitrary Text where
arbitrary = T.pack <$> arbitrary
instance (Ord k, Arbitrary k, Arbitrary v) => Arbitrary (Map.Map k v) where
arbitrary = Map.fromList <$> arbitrary
instance Arbitrary Foo where
arbitrary = liftM4 Foo arbitrary arbitrary arbitrary arbitrary
data UFoo = UFoo {
_UFooInt :: Int
, uFooInt :: Int
} deriving (Show, Eq, Data, Typeable)
instance Arbitrary UFoo where
arbitrary = UFoo <$> arbitrary <*> arbitrary
where _ = uFooInt
main :: IO ()
main = defaultMain tests
tests :: [Test]
tests = [
testGroup "encode" [
testProperty "encodeDouble" encodeDouble
, testProperty "encodeInteger" encodeInteger
],
testGroup "genericFrom" [
testProperty "Bool" $ genericFrom True
, testProperty "Double" $ genericFrom (1::Double)
, testProperty "Int" $ genericFrom (1::Int)
, testProperty "Foo" $ genericFrom (undefined::Foo)
],
testGroup "genericTo" [
testProperty "Bool" $ genericTo True
, testProperty "Double" $ genericTo (1::Double)
, testProperty "Int" $ genericTo (1::Int)
, testProperty "Foo" $ genericTo (undefined::Foo)
],
testGroup "roundTrip" [
testProperty "Bool" $ roundTripEq True
, testProperty "Double" $ roundTrip approxEq (1::Double)
, testProperty "Int" $ roundTripEq (1::Int)
, testProperty "Integer" $ roundTripEq (1::Integer)
, testProperty "String" $ roundTripEq (""::String)
, testProperty "Text" $ roundTripEq T.empty
, testProperty "Foo" $ roundTripEq (undefined::Foo)
],
testGroup "toFromJSON" [
testProperty "Integer" (toFromJSON :: Integer -> Bool)
, testProperty "Double" (toFromJSON :: Double -> Bool)
, testProperty "Maybe Integer" (toFromJSON :: Maybe Integer -> Bool)
, testProperty "Either Integer Double" (toFromJSON :: Either Integer Double -> Bool)
, testProperty "Either Integer Integer" (toFromJSON :: Either Integer Integer -> Bool)
],
testGroup "genericToFromJSON" [
testProperty "_UFoo" (genericToFromJSON :: UFoo -> Bool)
]
]
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