assertEquals("2", "aaa/bbb", ResourceUtil.removeExtension("aaa/bbb"));
    }

    /**
     * @throws Exception
     */
    public void testToExternalForm() throws Exception {
        final URL url = new File("/Program File").toURI().toURL();
        assertEquals("file:" + getRoot() + "Program File", ResourceUtil.toExternalForm(url));
    }

    /**