input = "text \"with\" quotes, and commas";
        result = KuromojiCSVUtil.quoteEscape(input);
        assertEquals("\"text \"\"with\"\" quotes, and commas\"", result);
    }

    public void test_quoteEscape_edge_cases() {
        String input;
        String result;

        // Empty string
        input = "";
        result = KuromojiCSVUtil.quoteEscape(input);
        assertEquals("", result);