public void CheckIfDFSIsCorrect() { var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; var graph = new DirectedWeightedALGraph <int, int>(); graph.AddVertices(vertices); // Graph is: // 1 -> 3, 4 // 1 <- 2 // 2 -> 1, 5 // 2 <- 3, 5, 6 // 3 -> 2, 6 // 3 <- 1, 4 // 4 -> 3, 6 // 4 <- 1, 7 // 5 -> 2, 7, 8 // 5 <- 2, 8 // 6 -> 2 // 6 <- 3, 4 // 7 -> 4 // 7 <- 5, 8 // 8 -> 5, 7 // 8 <- 5 // 9 -> // 9 <- // With each edge having a weight of the diffrenece between the source and destination vertex (source - destination) graph.AddEdge(1, 3, -2); graph.AddEdge(1, 4, -3); graph.AddEdge(2, 1, 1); graph.AddEdge(2, 5, -3); graph.AddEdge(3, 2, 1); graph.AddEdge(3, 6, -3); graph.AddEdge(4, 3, 1); graph.AddEdge(4, 6, -2); graph.AddEdge(5, 2, 3); graph.AddEdge(5, 7, -2); graph.AddEdge(5, 8, -3); graph.AddEdge(6, 2, 4); graph.AddEdge(7, 4, 3); graph.AddEdge(8, 5, 3); graph.AddEdge(8, 7, 1); // Expected dfs for vertex 1: // 1 | 3 | 2 | 5 | 7 | 4 | 6 | 8 var dfsExpectedOutput = new int[] { 1, 3, 2, 5, 7, 4, 6, 8 }; var dfs = graph.DepthFirstSearch(1).ToList(); Assert.IsTrue(dfs.Count == dfsExpectedOutput.Length); for (int i = 0; i < dfs.Count; i++) { Assert.IsTrue(dfs[i] == dfsExpectedOutput[i]); } // Expected dfs edges for vertex 1: // 1 | 3 | 2 | 5 | 7 | 4 | 5 // 3 | 2 | 5 | 7 | 4 | 6 | 8 var dfsExpectedSources = new int[] { 1, 3, 2, 5, 7, 4, 5 }; var dfsExpectedDestinations = new int[] { 3, 2, 5, 7, 4, 6, 8 }; var dfsEdges = graph.DepthFirstSearchEdges(1).ToList(); Assert.IsTrue(dfsEdges.Count == dfsExpectedSources.Length); for (int i = 0; i < dfsEdges.Count; i++) { Assert.IsTrue(dfsEdges[i].Source == dfsExpectedSources[i]); Assert.IsTrue(dfsEdges[i].Destination == dfsExpectedDestinations[i]); Assert.IsTrue(dfsEdges[i].Weight == dfsEdges[i].Source - dfsEdges[i].Destination); } // Expected dfs for vertex 8: // 8 | 5 | 2 | 1 | 3 | 6 | 4 | 7 dfsExpectedOutput = new int[] { 8, 5, 2, 1, 3, 6, 4, 7 }; dfs = graph.DepthFirstSearch(8).ToList(); Assert.IsTrue(dfs.Count == dfsExpectedOutput.Length); for (int i = 0; i < dfs.Count; i++) { Assert.IsTrue(dfs[i] == dfsExpectedOutput[i]); } // Expected dfs edges for vertex 8: // 8 | 5 | 2 | 1 | 3 | 1 | 5 // 5 | 2 | 1 | 3 | 6 | 4 | 7 dfsExpectedSources = new int[] { 8, 5, 2, 1, 3, 1, 5 }; dfsExpectedDestinations = new int[] { 5, 2, 1, 3, 6, 4, 7 }; dfsEdges = graph.DepthFirstSearchEdges(8).ToList(); Assert.IsTrue(dfsEdges.Count == dfsExpectedSources.Length); for (int i = 0; i < dfsEdges.Count; i++) { Assert.IsTrue(dfsEdges[i].Source == dfsExpectedSources[i]); Assert.IsTrue(dfsEdges[i].Destination == dfsExpectedDestinations[i]); Assert.IsTrue(dfsEdges[i].Weight == dfsEdges[i].Source - dfsEdges[i].Destination); } }