public void GivenMultipleElementAreInTheModelWhenReorderElementIsCalledOrderIsChanged()
{
DsmElementModel model = new DsmElementModel();
Assert.AreEqual(1, model.GetElementCount());
IDsmElement a = model.AddElement("a", "", null);
Assert.AreEqual(1, a.Id);
IDsmElement a1 = model.AddElement("a1", "eta", a.Id);
Assert.AreEqual(2, a1.Id);
IDsmElement a2 = model.AddElement("a2", "eta", a.Id);
Assert.AreEqual(3, a2.Id);
IDsmElement a3 = model.AddElement("a3", "eta", a.Id);
Assert.AreEqual(4, a3.Id);
IDsmElement a4 = model.AddElement("a4", "eta", a.Id);
Assert.AreEqual(5, a4.Id);
List <IDsmElement> rootElementsBefore = model.GetRootElement().Children.ToList();
Assert.AreEqual(1, rootElementsBefore.Count);
Assert.AreEqual(a, rootElementsBefore[0]);
Assert.AreEqual(4, rootElementsBefore[0].Children.Count);
Assert.AreEqual(a1, rootElementsBefore[0].Children[0]);
Assert.AreEqual(a2, rootElementsBefore[0].Children[1]);
Assert.AreEqual(a3, rootElementsBefore[0].Children[2]);
Assert.AreEqual(a4, rootElementsBefore[0].Children[3]);
Sequence sequence = new Sequence(rootElementsBefore[0].Children.Count);
model.ReorderChildren(a, sequence);
List <IDsmElement> rootElementsAfter = model.GetRootElement().Children.ToList();
Assert.AreEqual(1, rootElementsAfter.Count);
Assert.AreEqual(a, rootElementsAfter[0]);
Assert.AreEqual(4, rootElementsAfter[0].Children.Count);
Assert.AreEqual(a2, rootElementsAfter[0].Children[0]);
Assert.AreEqual(a3, rootElementsAfter[0].Children[1]);
Assert.AreEqual(a4, rootElementsAfter[0].Children[2]);
Assert.AreEqual(a1, rootElementsAfter[0].Children[3]);
}
