{-# LANGUAGE CPP
, NoImplicitPrelude
, ScopedTypeVariables
#-}
module TestUtils where
-------------------------------------------------------------------------------
-- Imports
-------------------------------------------------------------------------------
-- from base:
import Control.Applicative ( (<$>) )
import Control.Concurrent ( threadDelay )
import Control.Exception ( try, SomeException )
import Control.Monad ( return )
import Data.Bool ( Bool, not )
import Data.Either ( Either(Left, Right) )
import Data.Int ( Int )
import Data.Maybe ( isJust )
import Prelude ( String )
import System.IO ( IO )
import System.Timeout ( timeout )
#if __GLASGOW_HASKELL__ < 700
import Prelude ( fromInteger )
import Control.Monad ( (>>=), fail )
#endif
-- from HUnit:
import Test.HUnit ( Assertion, assertFailure )
-------------------------------------------------------------------------------
-- Utilities for testing
-------------------------------------------------------------------------------
-- Exactly 1 moment. Currently equal to 0.005 seconds.
a_moment :: Int
a_moment = 5000
wait_a_moment :: IO ()
wait_a_moment = threadDelay a_moment
-- True if the action 'a' evaluates within 't' μs.
within :: Int -> IO a -> IO Bool
within t a = isJust <$> timeout t a
notWithin :: Int -> IO a -> IO Bool
notWithin t a = not <$> within t a
assertException :: String -> IO a -> Assertion
assertException errMsg a = do e <- try a
case e of
Left (_ :: SomeException ) -> return ()
Right _ -> assertFailure errMsg