public void RemoveEngineTest()
{
var parent = new DockPaneLayoutEngine(new DockPaneBase());
var target = new DockPaneLayoutEngine(new DockPaneBase());
var layout = new DockPaneLayoutEngine(new DockPaneBase());
parent.AddEngine(target);
target.Parent = parent;
target.AddEngine(layout);
layout.Parent = target;
target.RemoveEngine(layout);
var parent_acc = DockPaneLayoutEngine_Accessor.AttachShadow(parent);
Assert.IsTrue(parent_acc.OwnNodes.Contains(parent));
Assert.IsTrue(parent_acc.OwnNodes.Contains(target));
Assert.IsFalse(parent_acc.OwnNodes.Contains(layout));
Assert.AreEqual(2, parent_acc.OwnNodes.Count);
var target_acc = DockPaneLayoutEngine_Accessor.AttachShadow(target);
Assert.IsTrue(target_acc.OwnNodes.Contains(target));
Assert.IsFalse(target_acc.OwnNodes.Contains(layout));
Assert.AreEqual(1, target_acc.OwnNodes.Count);
}