// Single comma
        input = ",";
        result = KuromojiCSVUtil.quoteEscape(input);
        assertEquals("\",\"", result);
    }

    @Test
    public void test_quoteEscape_special_characters() {
        String input;
        String result;

        // Newlines
        input = "line1\nline2";
        result = KuromojiCSVUtil.quoteEscape(input);