public void TestDeletions()
{
RootGraph root = Utils.CreateUniqueTestGraph();
Node tail = root.GetOrAddNode("1");
Node head = root.GetOrAddNode("2");
Node other = root.GetOrAddNode("3");
Edge edge = root.GetOrAddEdge(tail, head, "edge");
Edge tailout = root.GetOrAddEdge(tail, other, "tailout");
Edge headout = root.GetOrAddEdge(head, other, "headout");
Edge tailin = root.GetOrAddEdge(other, tail, "tailin");
Edge headin = root.GetOrAddEdge(other, head, "headin");
Assert.IsTrue(root.Equals(root.MyRootGraph));
Assert.IsTrue(root.Equals(tail.MyRootGraph));
Assert.IsTrue(root.Equals(edge.MyRootGraph));
Assert.AreEqual(3, tail.TotalDegree());
Assert.AreEqual(3, head.TotalDegree());
Assert.AreEqual(3, root.Nodes().Count());
root.Delete(edge);
Assert.AreEqual(2, tail.TotalDegree());
Assert.AreEqual(2, head.TotalDegree());
Assert.AreEqual(3, root.Nodes().Count());
root.Delete(tail);
Assert.AreEqual(2, root.Nodes().Count());
Assert.AreEqual(2, other.TotalDegree());
}
