public void GetEdgeByTag_Should_Retrieve_Node_By_Tag() {
var tracker = new EdgeTracker();
var node1 = MockRepository.GenerateMock<IGraphNode>();
var node2 = MockRepository.GenerateMock<IGraphNode>();
var node3 = MockRepository.GenerateMock<IGraphNode>();
var node4 = MockRepository.GenerateMock<IGraphNode>();
var edge1 = new UndirectedEdge(new NodeTarget(node1), new NodeTarget(node2)) {Tag = 1};
var edge2 = new UndirectedEdge(new NodeTarget(node3), new NodeTarget(node4)) { Tag = 2 };
tracker.AddEdge(edge1);
tracker.AddEdge(edge2);
Assert.AreEqual(tracker.Edges.Count(), 2);
Assert.AreSame(tracker.GetEdgeByTag(1), edge1);
Assert.AreSame(tracker.GetEdgeByTag(2), edge2);
}
public void GetEdgeByTag_With_Invalid_Tag_Should_Return_Null() {
var tracker = new EdgeTracker();
var node1 = MockRepository.GenerateMock<IGraphNode>();
var node2 = MockRepository.GenerateMock<IGraphNode>();
var edge = new UndirectedEdge(new NodeTarget(node1), new NodeTarget(node2));
tracker.AddEdge(edge);
Assert.AreEqual(tracker.Edges.Count(), 1);
Assert.IsNull(tracker.GetEdgeByTag(2));
}