public static boolean isQuoted(String s) {
        return isSingleQuoted(s) || isDoubleQuoted(s);
    }
@Test
    public void testIsQuoted() {
        assertFalse(StringHelper.isQuoted(null));
        assertFalse(StringHelper.isQuoted(""));
        assertFalse(StringHelper.isQuoted(" "));
        assertFalse(StringHelper.isQuoted("abc"));
        assertFalse(StringHelper.isQuoted("abc'"));
        assertFalse(StringHelper.isQuoted("\"abc'"));
        assertFalse(StringHelper.isQuoted("abc\""));
        assertFalse(StringHelper.isQuoted("'abc\""));
        assertFalse(StringHelper.isQuoted("\"abc'"));
        assertFalse(StringHelper.isQuoted("abc'def'"));
        assertFalse(StringHelper.isQuoted("abc'def'ghi"));
        assertFalse(StringHelper.isQuoted("'def'ghi"));

        assertTrue(StringHelper.isQuoted("'abc'"));
        assertTrue(StringHelper.isQuoted("\"abc\""));
    }