public void VerticalAlignTest()
{
var renderer = Substitute.For <NullRenderer>(); // mock the renderer
var hardware = new NullHardware(1024, 768);
var stage = new GuiStage();
var box = new HBox();
stage.AddChild(box); // makes a size of 60x40 just through padding
var spacerNone = new Spacer(100, 100).SetVAlign(VerticalAlign.None);
box.AddChild(spacerNone);
var spacerTop = new Spacer(100, 100).SetVAlign(VerticalAlign.Top);
box.AddChild(spacerTop);
var spacerMiddle = new Spacer(100, 100).SetVAlign(VerticalAlign.Middle);
box.AddChild(spacerMiddle);
var spacerBottom = new Spacer(100, 100).SetVAlign(VerticalAlign.Bottom);
box.AddChild(spacerBottom);
// we add one child that will free up some height
box.AddChild(new Spacer(100, 400));
stage.CalculateLayout(hardware);
// since we have not set a height on the hBox yet we expect all children to be not vertically aligned
Assert.That(box.GetLayout().GetCalculatedHeight(), Is.EqualTo(400));
Assert.That(box.GetLayout().GetCalculatedContentHeight(), Is.EqualTo(400));
Assert.That(spacerNone.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(0)); // NONE stays on top
Assert.That(spacerTop.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(0)); // TOP stays on top
Assert.That(spacerMiddle.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(150)); // MIDDLE 400 / 2 - 100 / 2
Assert.That(spacerBottom.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(300)); // BOTTOM 400 - 100
// new we set a height and then we expect the children to be aligned
box.SetHeight(800);
stage.CalculateLayout(hardware);
Assert.That(box.GetLayout().GetCalculatedHeight(), Is.EqualTo(800));
Assert.That(box.GetLayout().GetCalculatedContentHeight(), Is.EqualTo(400));
Assert.That(spacerNone.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(0)); // NONE stays on top
Assert.That(spacerTop.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(0)); // TOP stays on top
Assert.That(spacerMiddle.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(350)); // MIDDLE 800 / 2 - 100 / 2
Assert.That(spacerBottom.GetLayoutProcessingData().AbsoluteGeometry.Top, Is.EqualTo(700)); // BOTTOM (800 - 100)
}