private void assert_properties_have_default_values(FeedModel model)
{
Assert.Null(model.Copyright);
Assert.Equal(0, model.KeyframeNumber);
Assert.Equal(0, model.MessageCount);
Assert.Equal(TimeSpan.Zero, model.PingInterval);
Assert.Null(model.LastMessageReceivedOn);
Assert.Null(model.Timestamp);
}