public String toString() {
        return string;
    }
@Test
    public void testTrim() {
        assertEquals("text/plain", new MediaType(" text ", " plain ").toString());
        assertEquals("text/plain", new MediaType("\ttext", "plain\t").toString());

        Map<String, String> parameters = new HashMap<>();
        assertEquals("text/plain", new MediaType("text\r\n", " \tplain", parameters).toString());

        parameters.put(" charset", "UTF-8");
        assertEquals("text/plain; charset=UTF-8",
                new MediaType("\n\ntext", "plain \r", parameters).toString());

        parameters.put("\r\n\tx-eol-style  \t", "crlf");
        assertEquals("text/plain; charset=UTF-8; x-eol-style=crlf",
                new MediaType("    text", "\tplain ", parameters).toString());
    }