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{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Data.GenValidity.GenericSpec
( spec,
)
where
import Control.Monad
import Data.GenValidity
import Data.Proxy
import Data.Typeable
import GHC.Generics (Generic, Rep)
import Test.Hspec
import Test.QuickCheck
spec :: Spec
spec = do
describe "genValidStructurally" $ do
genValidstructurallySpec (Proxy :: Proxy Bool)
genValidstructurallySpec (Proxy :: Proxy Ordering)
genValidstructurallySpec (Proxy :: Proxy (Maybe Double))
genValidstructurallySpec (Proxy :: Proxy (Either Double Ordering))
genValidstructurallySpec (Proxy :: Proxy MyType)
describe "shrinkValidStructurally" $ do
shrinkValidstructurallySpec (Proxy :: Proxy Bool)
shrinkValidstructurallySpec (Proxy :: Proxy Ordering)
shrinkValidstructurallySpec (Proxy :: Proxy (Maybe Double))
shrinkValidstructurallySpec (Proxy :: Proxy (Either Double Ordering))
shrinkValidstructurallySpec (Proxy :: Proxy MyType)
genValidstructurallySpec ::
forall a.
(Validity a, Show a, Typeable a, Generic a, GGenValid (Rep a)) =>
Proxy a ->
Spec
genValidstructurallySpec proxy =
it (unwords ["only generates valid", "\"" ++ nameOf proxy ++ "\"s"]) $
forAll (genValidStructurally :: Gen a) $ \a ->
case prettyValidate a of
Right _ -> return ()
Left err ->
expectationFailure $
unlines
[ "'validate' reported this value to be invalid: ",
show a,
"with explanation",
err,
""
]
shrinkValidstructurallySpec ::
forall a.
( Show a,
Eq a,
Typeable a,
Generic a,
GenValid a,
GValidRecursivelyShrink (Rep a),
GValidSubterms (Rep a) a
) =>
Proxy a ->
Spec
shrinkValidstructurallySpec proxy = do
it (unwords ["only shrinks to valid", "\"" ++ nameOf proxy ++ "\"s"]) $
forAll (genValid :: Gen a) $ \a ->
forM_ (shrinkValidStructurally a) $ \subA ->
case prettyValidate subA of
Right _ -> return ()
Left err ->
expectationFailure $
unlines
[ "'validate' reported this value to be invalid: ",
show subA,
"with explanation",
err,
"but it should have been valid from shrinking"
]
it
( unwords
["never shrinks to itself for valid", "\"" ++ nameOf proxy ++ "\"s"]
)
$ forAll (genValid :: Gen a)
$ \a ->
forM_ (shrinkValidStructurally a) $ \subA ->
when (subA == a) $
expectationFailure $
unlines [show a, "was shrunk to itself."]
nameOf ::
forall a.
(Typeable a) =>
Proxy a ->
String
nameOf = show . typeRep
data MyType
= MyType Double Ordering
deriving (Show, Eq, Generic, Typeable)
instance Validity MyType
instance GenValid MyType
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