}

  public void testWithCharset() {
    assertThat(MediaType.parse("text/plain").withCharset(UTF_8))
        .isEqualTo(MediaType.parse("text/plain; charset=utf-8"));
    assertThat(MediaType.parse("text/plain; charset=utf-16").withCharset(UTF_8))
        .isEqualTo(MediaType.parse("text/plain; charset=utf-8"));
  }

  public void testHasWildcard() {

   */
  public MediaType withCharset(Charset charset) {
    checkNotNull(charset);
    MediaType withCharset = withParameter(CHARSET_ATTRIBUTE, charset.name());
    // precache the charset so we don't need to parse it
    withCharset.parsedCharset = Optional.of(charset);
    return withCharset;
  }

  /** Returns true if either the type or subtype is the wildcard. */