public void RefreshWithFunc()
{
var num = 1;
var d = new Drawing (new Size (50, 50), s => {
for (var i = 0; i < num; i++) {
s.DrawEllipse (new Point (10*i, 20), new Size (30, 40), Pens.Black);
}
});
Assert.AreEqual (1, d.Graphic.Children.Count);
num = 2;
d.Invalidate ();
Assert.AreEqual (2, d.Graphic.Children.Count);
}
