public void TestRemoveEdges()
{
var graph = new DirectedMetaGraph(1, 1, 10);
// add and remove edge.
graph.AddEdge(0, 1, 1, 100);
Assert.AreEqual(0, graph.RemoveEdges(1));
Assert.AreEqual(1, graph.RemoveEdges(0));
// verify all edges.
var edges = graph.GetEdgeEnumerator(0);
Assert.AreEqual(0, edges.Count());
edges = graph.GetEdgeEnumerator(1);
Assert.AreEqual(0, edges.Count());
graph = new DirectedMetaGraph(1, 1, 10);
// add and remove edges.
graph.AddEdge(0, 1, 1, 100);
graph.AddEdge(0, 2, 1, 100);
Assert.AreEqual(2, graph.RemoveEdges(0));
// verify all edges.
edges = graph.GetEdgeEnumerator(0);
Assert.AreEqual(0, edges.Count());
edges = graph.GetEdgeEnumerator(1);
Assert.AreEqual(0, edges.Count());
edges = graph.GetEdgeEnumerator(2);
Assert.AreEqual(0, edges.Count());
graph = new DirectedMetaGraph(1, 1, 10);
// add and remove edges.
graph.AddEdge(0, 1, 1, 100);
graph.AddEdge(0, 2, 2, 200);
graph.AddEdge(1, 2, 3, 300);
Assert.AreEqual(2, graph.RemoveEdges(0));
// verify all edges.
edges = graph.GetEdgeEnumerator(0);
Assert.AreEqual(0, edges.Count());
edges = graph.GetEdgeEnumerator(1);
Assert.AreEqual(1, edges.Count());
edges = graph.GetEdgeEnumerator(2);
Assert.AreEqual(0, edges.Count());
graph = new DirectedMetaGraph(1, 1, 10);
// add and compress.
graph.AddEdge(0, 1, 10, 100);
graph.AddEdge(1, 2, 20, 200);
graph.AddEdge(2, 3, 30, 300);
graph.AddEdge(3, 4, 40, 400);
Assert.AreEqual(1, graph.RemoveEdge(1, 2));
// verify all edges.
edges = graph.GetEdgeEnumerator(0);
Assert.AreEqual(1, edges.Count());
Assert.AreEqual(10, edges.First().Data[0]);
Assert.AreEqual(100, edges.First().MetaData[0]);
Assert.AreEqual(1, edges.First().Neighbour);
edges = graph.GetEdgeEnumerator(1);
Assert.AreEqual(0, edges.Count());
edges = graph.GetEdgeEnumerator(2);
Assert.AreEqual(1, edges.Count());
Assert.AreEqual(30, edges.First().Data[0]);
Assert.AreEqual(300, edges.First().MetaData[0]);
Assert.AreEqual(3, edges.First().Neighbour);
edges = graph.GetEdgeEnumerator(3);
Assert.AreEqual(1, edges.Count());
Assert.AreEqual(40, edges.First().Data[0]);
Assert.AreEqual(400, edges.First().MetaData[0]);
Assert.AreEqual(4, edges.First().Neighbour);
}