assertEquals("\uffff\uffffabc", StringUtils.leftPad("abc", 5, '\uffff'));
    public void testLeftPad_StringIntChar() {        assertEquals(null, StringUtils.leftPad(null, 5, ' '));        assertEquals("     ", StringUtils.leftPad("", 5, ' '));        assertEquals("  abc", StringUtils.leftPad("abc", 5, ' '));        assertEquals("xxabc", StringUtils.leftPad("abc", 5, 'x'));        assertEquals("abc", StringUtils.leftPad("abc", 2, ' '));        String str = StringUtils.leftPad("aaa", 10000, 'a');  // bigger than pad length        assertEquals(10000, str.length());        assertEquals(true, StringUtils.containsOnly(str, new char[] {'a'}));    }