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module Minilang.IOSpec where
import Control.Exception (bracket)
import Minilang.IO (runEval)
import System.Directory (getTemporaryDirectory, removeFile)
import System.FilePath ((<.>), (</>))
import System.IO (IOMode (..), hClose, readFile, withFile, writeFile)
import System.Posix (mkstemp)
import Test.Hspec (Spec, around, describe, it, parallel, shouldBe)
import Prelude hiding (lines, readFile, writeFile)
spec :: Spec
spec = parallel $
describe "MiniLang I/O Evaluator" $ do
around withTempFile $
it "evaluates a simple MiniLang 'program' and dumps result" $ \fileName -> do
let outputFileName = fileName <> ".out"
program =
[ "((lam (x y) x) z t)"
]
writeFile fileName (unlines program)
_ <- withFile fileName ReadMode $ \hin ->
withFile outputFileName AppendMode $ \hout ->
runEval hin hout
out <- readFile outputFileName
out `shouldBe` "Var \"z\"\n"
withTempFile :: (String -> IO ()) -> IO ()
withTempFile =
bracket mkTempFile rmTempFile
where
mkTempFile = getTemporaryDirectory >>= \dir -> mkstemp (dir </> "test-repl") >>= \(fp, h) -> hClose h >> pure fp
rmTempFile fn = removeFile fn >> removeFile (fn <.> "out")
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