public void GetShortestPath_GivenTwoPaths_ReturnsOnlyShorterOne()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "B");
UserNode user3 = new UserNode("A", "C");
user1.AddFriend(user2);
user2.AddFriend(user3);
user1.AddFriend(user3);
graph.Add(user1);
graph.Add(user2);
graph.Add(user3);
var paths = graph.GetShortestPaths(user1, user3);
int resultPathsSize = paths.Count;
int expectedPathsSize = 1;
Assert.AreEqual(expectedPathsSize, resultPathsSize);
var resultPath = paths[0];
var expectedPath = new LinkedList <UserNode>(new UserNode[] { user1, user3 });
CollectionAssert.AreEqual(expectedPath, resultPath);
}
public void GetDistance_GivenNoCommonFriendsAtWithDistanceOf3WithMultipleRoutes_Returns3()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "B");
UserNode user2b = new UserNode("A", "C");
UserNode user3 = new UserNode("A", "D");
UserNode user3b = new UserNode("A", "E");
UserNode user3c = new UserNode("A", "F");
UserNode user4 = new UserNode("A", "G");
user1.AddFriend(user2);
user1.AddFriend(user2b);
user2.AddFriend(user3b);
user3.AddFriend(user2);
user3.AddFriend(user2b);
user3.AddFriend(user3b);
user3.AddFriend(user3c);
user4.AddFriend(user3);
graph.Add(user1);
graph.Add(user2);
graph.Add(user2b);
graph.Add(user3);
graph.Add(user3b);
graph.Add(user3c);
graph.Add(user4);
int distance = graph.GetDistance(user1, user4);
int expected = 3;
Assert.AreEqual(expected, distance);
}
private static void AllPathsCyclicGraph()
{
UserNode NodeA = new UserNode("Node", "A");
UserNode NodeB = new UserNode("Node", "B");
UserNode NodeC = new UserNode("Node", "C");
UserNode NodeD = new UserNode("Node", "D");
NodeA.AddFriend(NodeB);
NodeA.AddFriend(NodeC);
NodeB.AddFriend(NodeD);
NodeB.AddFriend(NodeC);
NodeC.AddFriend(NodeD);
List <UserNode> graph = new List <UserNode>()
{
NodeA, NodeB, NodeC, NodeD
};
foreach (var node in graph)
{
foreach (var targetNode in graph)
{
Console.WriteLine($"\nPath(s) from node {node} to {targetNode} is:");
var currentPaths = BFS.BFS.GetAllPaths(graph, node, targetNode);
foreach (var path in currentPaths)
{
Console.Write("Path: ");
foreach (var pathMemeber in path)
{
Console.Write($"{pathMemeber}, ");
}
Console.WriteLine();
}
}
Console.WriteLine('\n');
}
//var paths = BFS.BFS.GetAllPaths(graph, NodeA, NodeB);
//Console.WriteLine("DDB");
//Console.WriteLine(paths);
//foreach (var path in paths)
//{
// foreach(var pathMember in path)
// {
// Console.Write($"{pathMember},");
// }
// Console.WriteLine();
//}
}
public void GetShortestPath_GivenTwoEqualPaths_ReturnsBoth()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "B");
UserNode user2b = new UserNode("A", "B");
UserNode user3 = new UserNode("A", "C");
user1.AddFriend(user2);
user1.AddFriend(user2b);
user2b.AddFriend(user3);
user2.AddFriend(user3);
graph.Add(user1);
graph.Add(user2);
graph.Add(user2b);
graph.Add(user3);
var paths = graph.GetShortestPaths(user1, user3);
var expectedPath1 = new LinkedList <UserNode>(new UserNode[] { user1, user2, user3 });
var expectedPath2 = new LinkedList <UserNode>(new UserNode[] { user1, user2b, user3 });
bool path1Found = false;
bool path2Found = false;
foreach (var list in paths)
{
if (list.SequenceEqual(expectedPath1))
{
path1Found = true;
}
if (list.SequenceEqual(expectedPath2))
{
path2Found = true;
}
}
Assert.IsTrue(path1Found && path2Found);
}
public void GetFriendsOfFriends_GivenADepthOf2_ReturnsFriendsOfFriends()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "B");
UserNode user2b = new UserNode("A", "C");
UserNode user3 = new UserNode("A", "D");
user1.AddFriend(user2);
user1.AddFriend(user2b);
user2.AddFriend(user3);
graph.Add(user1);
graph.Add(user2);
graph.Add(user2b);
graph.Add(user3);
List <UserNode> friends = graph.GetFriendsOfFriends(user1, 2);
Assert.IsTrue(friends.Contains(user2) && friends.Contains(user2b) && friends.Contains(user3));
}
private void GenerateTree(UserNode user, List <UserNode> allUsers, int depth)
{
if (depth == 0)
{
return;
}
for (int i = 0; i < depth; i++)
{
UserNode newUser = GenerateNewUser();
user.AddFriend(newUser);
allUsers.Add(newUser);
GenerateTree(newUser, allUsers, depth - 1);
}
}
public void GetFriendsOfFriends_GivenADepthOf1_ContainsFriendsOnlyOnce()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "B");
UserNode user2b = new UserNode("A", "C");
user1.AddFriend(user2);
user1.AddFriend(user2b);
user2.AddFriend(user2b);
graph.Add(user1);
graph.Add(user2);
graph.Add(user2b);
List <UserNode> friends = graph.GetFriendsOfFriends(user1, 1);
int result = friends.Count;
int expected = 2;
Assert.AreEqual(expected, result);
}
public void GetDistance_GivenMultipleCommonFriends_Returns2()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "B");
UserNode user2b = new UserNode("A", "C");
UserNode user3 = new UserNode("A", "D");
user1.AddFriend(user2);
user3.AddFriend(user2);
user1.AddFriend(user2b);
user3.AddFriend(user2b);
graph.Add(user1);
graph.Add(user2);
graph.Add(user2b);
graph.Add(user3);
int distance = graph.GetDistance(user1, user3);
int expected = 2;
Assert.AreEqual(expected, distance);
}
public void GetDistance_GivenDirectFriends_Returns1()
{
Graph graph = new Graph();
UserNode user1 = new UserNode("A", "A");
UserNode user2 = new UserNode("A", "C");
user1.AddFriend(user2);
graph.Add(user1);
graph.Add(user2);
int distance = graph.GetDistance(user1, user2);
int expected = 1;
Assert.AreEqual(expected, distance);
}
