public void CreateWithIntervalNode()
{
StructureNode node1 = CreateNode("node1", 1);
StructureNode node2 = CreateNode("node2", 2);
Interval i1 = new Interval(1, node1);
Interval i2 = new Interval(2, node2);
StructureNode node3 = CreateNode("node3", 3);
i2.AddNode(node3);
Interval i = new Interval(3, i1);
i.AddNode(i2);
Assert.AreEqual(2, i.Nodes.Count);
}