assertNull(StringUtil.camelize(null));
        assertEquals("Emp", StringUtil.camelize("EMP"));
        assertEquals("AaaBbb", StringUtil.camelize("AAA_BBB"));
        assertEquals("UserId", StringUtil.camelize("USER_ID"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testDecamelize() throws Exception {
        assertNull(StringUtil.decamelize(null));

    }

    /**
     * Converts an underscore-separated string to camel case.
     * <p>
     * Usage example:
     * </p>
     *
     * <pre>
     * StringUtil.camelize("USER_ID")  = "UserId"
     * </pre>
     *
     * @param s
     *            the text
     * @return the resulting string
     */
    public static String camelize(String s) {
        if (s == null) {