public void ExtractRequestSize()
{
var opts = GetOptions();
var tracing = new OpenTelemetryTracing(opts, null);
var obs = new AspNetCoreHostingObserver(opts, tracing);
var request = GetHttpRequestMessage();
request.Request.Body.WriteByte(1);
request.Request.Body.WriteByte(2);
var result = obs.ExtractRequestSize(request);
Assert.NotNull(result);
Assert.Equal(2, result.Value);
}