public void UndirectGraphDeleteVertexTest() { UndirectGraph<int> graph = new UndirectGraph<int>(); graph.AddEdge(0, 1); graph.AddEdge(2, 0); graph.AddVertex(3); graph.DeleteVertex(3); graph.DeleteVertex(2); string t1 = String.Format("{0} -> {1}{2}{1} -> {0}{2}", 0, 1, Environment.NewLine); Assert.AreEqual(t1, graph.ToString()); graph.DeleteVertex(0); graph.DeleteVertex(0); string t2 = String.Format("{0}{1}", 1, Environment.NewLine); Assert.AreEqual(t2, graph.ToString()); graph.DeleteVertex(1); Assert.AreEqual("", graph.ToString()); Assert.AreEqual(0, graph.CountVertices); Assert.AreEqual(0, graph.CountEdges); }