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|
{-# LANGUAGE CPP #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}
-- |
-- Module : Main
-- Copyright : (c) Geoffrey Mainland 2011-2014
-- License : BSD-style
-- Maintainer : mainland@cs.drexel.edu
module Main where
#if defined(__GLASGOW_HASKELL__) && (__GLASGOW_HASKELL__ < 706)
import Prelude hiding (catch)
#endif
import Control.Monad.Exception
#if !MIN_VERSION_transformers(0,6,0)
import Control.Monad.Trans.Error
#endif /* !MIN_VERSION_transformers(0,6,0) */
import Control.Monad.Trans.Except
import Control.Monad.IO.Class
import Data.IORef
import Test.Framework
import Test.Framework.Providers.HUnit
import Test.HUnit (Assertion, (@?=))
main :: IO ()
main = defaultMain tests
tests :: [Test]
tests = [ exceptTests
#if !MIN_VERSION_transformers(0,6,0)
, errorTests
#endif /* !MIN_VERSION_transformers(0,6,0) */
]
#if !MIN_VERSION_transformers(0,6,0)
errorTests :: Test
errorTests = testGroup "ErrorT tests"
[testCase (conl ++ " " ++ whatl) (mkErrorTest con what) | (conl, con) <- cons, (whatl, what) <- whats]
where
whats :: [(String, ErrorT String IO ())]
whats = [("return", return ()),
("error", error "error"),
("throwError", throwError "throwError")]
cons :: [(String, ErrorT String IO () -> ErrorT String IO () -> ErrorT String IO ())]
cons = [("finally", \what sequel -> what `finally` sequel),
("bracket_", \what sequel -> bracket_ (return ()) sequel what)]
mkErrorTest :: (ErrorT String IO () -> ErrorT String IO () -> ErrorT String IO ())
-> ErrorT String IO ()
-> Assertion
mkErrorTest con what = do
ref <- newIORef "sequel not called"
let sequel = liftIO $ writeIORef ref expected
_ <- runErrorT (con what sequel) `catch` \(e :: SomeException) -> return (Left (show e))
actual <- readIORef ref
expected @?= actual
where
expected :: String
expected = "sequel called"
#endif /* !MIN_VERSION_transformers(0,6,0) */
exceptTests :: Test
exceptTests = testGroup "ExceptT tests"
[testCase (conl ++ " " ++ whatl) (mkExceptTest con what) | (conl, con) <- cons, (whatl, what) <- whats]
where
whats :: [(String, ExceptT String IO ())]
whats = [("return", return ()),
("error", error "error"),
("throwE", throwE "throwE")]
cons :: [(String, ExceptT String IO () -> ExceptT String IO () -> ExceptT String IO ())]
cons = [("finally", \what sequel -> what `finally` sequel),
("bracket_", \what sequel -> bracket_ (return ()) sequel what)]
mkExceptTest :: (ExceptT String IO () -> ExceptT String IO () -> ExceptT String IO ())
-> ExceptT String IO ()
-> Assertion
mkExceptTest con what = do
ref <- newIORef "sequel not called"
let sequel = liftIO $ writeIORef ref expected
_ <- runExceptT (con what sequel) `catch` \(e :: SomeException) -> return (Left (show e))
actual <- readIORef ref
expected @?= actual
where
expected :: String
expected = "sequel called"
|
