public void ContentType_ReadAndWriteProperty_ValueMatchesPriorSetValue()
{
MediaTypeHeaderValue value = new MediaTypeHeaderValue("text/plain");
value.CharSet = "utf-8";
value.Parameters.Add(new NameValueHeaderValue("custom", "value"));
Assert.Null(_headers.ContentType);
_headers.ContentType = value;
Assert.Same(value, _headers.ContentType);
_headers.ContentType = null;
Assert.Null(_headers.ContentType);
}