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diff --git a/haddock-test/src/Test/Haddock/Utils.hs b/haddock-test/src/Test/Haddock/Utils.hs
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+++ b/haddock-test/src/Test/Haddock/Utils.hs
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+module Test.Haddock.Utils where
+
+
+import Control.Monad
+
+import Data.Maybe
+
+import System.Directory
+import System.FilePath
+
+
+mlast :: [a] -> Maybe a
+mlast = listToMaybe . reverse
+
+
+partitionM :: Monad m => (a -> m Bool) -> [a] -> m ([a], [a])
+partitionM _ [] = pure ([], [])
+partitionM p (x:xs) = do
+    (ss, fs) <- partitionM p xs
+    b <- p x
+    pure $ if b then (x:ss, fs) else (ss, x:fs)
+
+
+whenM :: Monad m => m Bool -> m () -> m ()
+whenM mb action = mb >>= \b -> when b action
+
+
+getDirectoryTree :: FilePath -> IO [FilePath]
+getDirectoryTree path = do
+    (dirs, files) <- partitionM isDirectory =<< contents
+    subfiles <- fmap concat . forM dirs $ \dir ->
+        map (dir </>) <$> getDirectoryTree (path </> dir)
+    pure $ files ++ subfiles
+  where
+    contents = filter realEntry <$> getDirectoryContents path
+    isDirectory entry = doesDirectoryExist $ path </> entry
+    realEntry entry = not $ entry == "." || entry == ".."
+
+
+createEmptyDirectory :: FilePath -> IO ()
+createEmptyDirectory path = do
+    whenM (doesDirectoryExist path) $ removeDirectoryRecursive path
+    createDirectory path
+
+
+-- | Just like 'copyFile' but output directory path is not required to exist.
+copyFile' :: FilePath -> FilePath -> IO ()
+copyFile' old new = do
+    createDirectoryIfMissing True $ takeDirectory new
+    copyFile old new