public String toString() {
        return string;
    }
@Test
    public void testQuote() {
        Map<String, String> parameters = new HashMap<>();
        parameters.put("a", " value with spaces ");
        parameters.put("b", "text/plain");
        parameters.put("c", "()<>@,;:\\\"/[]?=");
        assertEquals("text/plain; a=\" value with spaces \"; b=\"text\\/plain\"" +
                        "; c=\"\\(\\)\\<\\>\\@\\,\\;\\:\\\\\\\"\\/\\[\\]\\?\\=\"",
                new MediaType("text", "plain", parameters).toString());
    }