assertEquals("zip", URLUtil.toCanonicalProtocol("zip"));
        assertEquals("file", URLUtil.toCanonicalProtocol("file"));
    }

    /**
     * @throws Exception
     */
    public void testToFile() throws Exception {
        final File file = new File("Program Files/hoge.txt");
        final URL url = file.toURI().toURL();
        assertEquals(file.getAbsoluteFile(), URLUtil.toFile(url));