private static ArraySegment <byte> StringToUtf8BufferWithEmptySpace(string testString, int emptySpaceSize = 2048)
{
var utf8Bytes = new Utf8Span(testString).Bytes;
var buffer = new byte[utf8Bytes.Length + emptySpaceSize];
utf8Bytes.CopyTo(buffer);
return(new ArraySegment <byte>(buffer, 0, utf8Bytes.Length));
}
