47 lines
1.4 KiB
Haskell
47 lines
1.4 KiB
Haskell
module MonadSpec where
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import Test.Hspec
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import TestUtils
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import Control.Monad.Error.Class
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import Control.Concurrent
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import Control.Exception
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spec :: Spec
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spec = do
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describe "When using GhcModT in a do block" $
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it "a pattern match failure causes a call to `fail` on ErrorT in the monad stack" $ do
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(a, _h)
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<- runGmOutDef $ runGhcModT defaultOptions $
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do
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Just _ <- return Nothing
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return "hello"
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`catchError` (const $ fail "oh noes")
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a `shouldBe` (Left $ GMEString "oh noes")
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describe "runGhcModT" $
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it "throws an exception when run in multiple threads" $ do
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mv_ex :: MVar (Either SomeException ())
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<- newEmptyMVar
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mv_startup_barrier :: MVar () <- newEmptyMVar
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_t1 <- forkOS $ do
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putMVar mv_startup_barrier ()
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-- wait (inside GhcModT) for t2 to receive the exception
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_ <- runD $ liftIO $ readMVar mv_ex
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return ()
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_t2 <- forkOS $ do
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readMVar mv_startup_barrier -- wait for t1 to start up
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res <- try $ runD $ return ()
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res' <- evaluate res
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putMVar mv_ex res'
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ex <- takeMVar mv_ex
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isLeft ex `shouldBe` True
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isLeft :: Either a b -> Bool
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isLeft (Right _) = False
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isLeft (Left _) = True
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