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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Test.Hspec.SmallCheckSpec (main, spec) where
import Test.Hspec
import Data.Orphans ()
import qualified Control.Exception as E
import qualified Test.Hspec.Core.Spec as H
import qualified Test.Hspec.Runner as H
import Test.SmallCheck
import Test.QuickCheck (stdArgs)
import Test.HUnit (Assertion, assertFailure, assertEqual)
import Test.Hspec.SmallCheck
main :: IO ()
main = hspec spec
exceptionEq :: E.SomeException -> E.SomeException -> Bool
exceptionEq a b
| Just ea <- E.fromException a, Just eb <- E.fromException b = ea == (eb :: E.ErrorCall)
| Just ea <- E.fromException a, Just eb <- E.fromException b = ea == (eb :: E.ArithException)
| otherwise = undefined
deriving instance Eq H.FailureReason
deriving instance Eq H.ResultStatus
deriving instance Eq H.Result
instance Eq E.SomeException where
(==) = exceptionEq
spec :: Spec
spec = do
describe "evaluateExample" $ do
context "with Property IO" $ do
it "returns Success if property holds" $ do
eval True `shouldReturn` H.Result "" H.Success
it "returns Failure if property does not hold" $ do
eval False `shouldReturn` H.Result "" (H.Failure Nothing (H.Reason "condition is false"))
it "shows what falsified it" $ do
eval (/= (2 :: Int)) `shouldReturn` H.Result "" (H.Failure Nothing (H.Reason "there exists 2 such that\n condition is false"))
it "propagates exceptions" $ do
eval (error "foobar" :: Property IO) `shouldThrow` errorCall "foobar"
context "with HUnit Assertion" $ do
it "includes failure reason" $ do
H.Result "" (H.Failure _loc reason) <- eval ((\ _ -> assertFailure "some failure") :: Int -> Assertion)
reason `shouldBe` H.Reason "there exists 0 such that\nsome failure"
context "with assertEqual" $ do
it "includes actual and expected" $ do
H.Result "" (H.Failure _loc reason) <- eval (assertEqual "foo" (42 :: Int))
reason `shouldBe` H.ExpectedButGot (Just "there exists 0 such that\nfoo") "42" "0"
where
eval :: Testable IO a => a -> IO H.Result
eval = evaluateExample . property
evaluateExample :: (Example a, Arg a ~ ()) => a -> IO H.Result
evaluateExample e = H.evaluateExample e defaultParams ($ ()) (const $ return ())
defaultParams :: H.Params
defaultParams = H.Params stdArgs (H.configSmallCheckDepth H.defaultConfig)
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