module Utils where

import Test.HUnit

assertFalse :: String -> IO ()
assertFalse s = assertFailure s >> fail "assertFalse"

assertJust :: String -> Maybe a -> IO a
assertJust s a =
  case a of
    Nothing -> assertFailure s >> fail "assertJust failed"
    Just b  -> return b

assertRight :: (Show a) => Either a b -> IO b
assertRight a =
  case a of
    Left e  -> assertFailure (show e) >> fail "assertRight failed"
    Right b -> return b

assertLeft :: (Show b) => Either a b -> IO a
assertLeft a =
  case a of
    Left e  -> return e
    Right b -> assertFailure (show b) >> fail "assertLeft failed"