@Test
public void testGetCharsetAsRawCharSequence() {

    String QUOTES_CHARSET_CONTENT_TYPE = "text/html; charset=\"utf8\"";
    String SIMPLE_CONTENT_TYPE = "text/html";
    HttpMessage message = new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK);
    message.headers().set(HttpHeaderNames.CONTENT_TYPE, QUOTES_CHARSET_CONTENT_TYPE);
    assertEquals("\"utf8\"", HttpUtil.getCharsetAsSequence(message));
    assertEquals("\"utf8\"", HttpUtil.getCharsetAsSequence(QUOTES_CHARSET_CONTENT_TYPE));
    message.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html");
    assertNull(HttpUtil.getCharsetAsSequence(message));
    assertNull(HttpUtil.getCharsetAsSequence(SIMPLE_CONTENT_TYPE));
}