assertEquals("abc", StringUtil.substringFromLast("abc", ""));
        assertEquals("abc", StringUtil.substringFromLast("abc", null));
        assertEquals("abc", StringUtil.substringFromLast("abc", "dddd"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testSubstringToLast() throws Exception {
        assertEquals("", StringUtil.substringToLast("abc", "c"));