public void ExceptionForCyclicGraph()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
try
{
var topSort = graph.TopologicalSortSmallestFirst();
Assert.Fail();
}
catch (InvalidOperationException ex)
{
if (!ex.Message.Equals("Graph is cyclic!"))
{
Assert.Fail();
}
}
catch (Exception)
{
Assert.Fail();
}
}
public void TopologicalSortBiggestVerticesFirst()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <int>();
graph.AddVertices(vertices);
// Graph is:
// 1 -> 3, 4
// 2 -> 5
// 2 <- 3, 6
// 3 -> 2, 6
// 3 <- 1, 4
// 4 -> 3, 6, 7
// 4 <- 1
// 5 -> 7, 8
// 5 <- 2, 8
// 6 -> 2
// 6 <- 3, 4
// 7 -> 4
// 7 <- 5, 8
// 8 -> 7
// 8 <- 5
// 9 ->
// 9 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(4, 7);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(8, 7);
// Expected topological sort
// 9 1 4 3 6 2 5 8 7
var expected = new int[] { 9, 1, 4, 3, 6, 2, 5, 8, 7 };
var topSort = graph.TopologicalSortBiggestFirst();
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(topSort[i] == expected[i]);
}
}
public void DirectedCyclicGraphCheck()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
Assert.IsTrue(graph.IsCyclic());
}
public void BipartiteColoringOnDirectedGraphCheck()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <int>();
graph.AddVertices(vertices);
// Graph is:
// 1 -> 3, 4
// 1 <- 2
// 2 -> 1, 5
// 2 <- 5, 6
// 3 -> 6
// 3 <- 1
// 4 -> 6
// 4 <- 1, 5
// 5 -> 2, 4, 8
// 5 <- 2, 8
// 6 -> 2
// 6 <- 3, 4
// 7 -> 4
// 7 <- 5, 8
// 8 -> 5, 7
// 8 <- 5
// 9 ->
// 9 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 6);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 4);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
Dictionary <int, BipartiteColor> verticesColors;
Assert.IsTrue(graph.TryGetBipartiteColoring(out verticesColors));
foreach (var edge in graph.Edges)
{
Assert.IsTrue(verticesColors[edge.Source] != verticesColors[edge.Destination]);
}
// Check with not bipartite graph
graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
Assert.IsFalse(graph.TryGetBipartiteColoring(out verticesColors));
}
public void DirectedAndUnweightedGraphShortestsPathsCheck()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
// Expected shortest paths for vertex 1
// 1 to 2 : 1 -> 3 -> 2
// 1 to 3 : 1 -> 3
// 1 to 4 : 1 -> 4
// 1 to 5 : 1 -> 3 -> 2 -> 5
// 1 to 6 : 1 -> 3 -> 6
// 1 to 7 : 1 -> 3 -> 2 -> 5 -> 7
// 1 to 8 : 1 -> 3 -> 2 -> 5 -> 8
// 1 to 9 : no path
var expectedPaths = new int[7][]
{
new int[] { 1, 3, 2 },
new int[] { 1, 3 },
new int[] { 1, 4 },
new int[] { 1, 3, 2, 5 },
new int[] { 1, 3, 6 },
new int[] { 1, 3, 2, 5, 7 },
new int[] { 1, 3, 2, 5, 8 }
};
var paths = graph.DijkstraShortestPaths(1);
for (int i = 0; i < 7; i++)
{
var curPath = paths.VerticesPathTo(i + 2);
for (int j = 0; j < curPath.Count; j++)
{
if (expectedPaths[i][j] != curPath[j])
{
Assert.Fail();
}
}
}
Assert.IsFalse(paths.HasPathTo(9));
// Expected shortest paths for vertex 8
// 8 to 1 : 8 -> 5 -> 2 -> 1
// 8 to 2 : 8 -> 5 -> 2
// 8 to 3 : 8 -> 7 -> 4 -> 3
// 8 to 4 : 8 -> 7 -> 4
// 8 to 5 : 8 -> 5
// 8 to 6 : 8 -> 7 -> 4 -> 6
// 8 to 7 : 8 -> 7
// 8 to 9 : no path
expectedPaths = new int[7][]
{
new int[] { 8, 5, 2, 1 },
new int[] { 8, 5, 2 },
new int[] { 8, 7, 4, 3 },
new int[] { 8, 7, 4 },
new int[] { 8, 5 },
new int[] { 8, 7, 4, 6 },
new int[] { 8, 7 }
};
paths = graph.DijkstraShortestPaths(8);
for (int i = 0; i < 7; i++)
{
var curPath = paths.VerticesPathTo(i + 1);
for (int j = 0; j < curPath.Count; j++)
{
if (expectedPaths[i][j] != curPath[j])
{
Assert.Fail();
}
}
}
Assert.IsFalse(paths.HasPathTo(9));
}
public void CheckIfDFSIsCorrect()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
// 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]);
}
// 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]);
}
}
public void CheckIfBFSIsCorrect()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
// Expected bfs for vertex 1:
// 1 | 3 4 | 2 6 | 5 | 7 8
var bfsExpectedOutput = new int[] { 1, 3, 4, 2, 6, 5, 7, 8 };
var bfs = graph.BreadthFirstSearch(1).ToList();
Assert.IsTrue(bfs.Count == bfsExpectedOutput.Length);
for (int i = 0; i < bfs.Count; i++)
{
Assert.IsTrue(bfs[i] == bfsExpectedOutput[i]);
}
// Expected bfs edges for vertex 1:
// 1 1 | 3 3 | 2 | 5 5
// 3 4 | 2 6 | 5 | 7 8
var bfsExpectedSources = new int[] { 1, 1, 3, 3, 2, 5, 5 };
var bfsExpectedDestinations = new int[] { 3, 4, 2, 6, 5, 7, 8 };
var bfsEdges = graph.BreadthFirstSearchEdges(1).ToList();
Assert.IsTrue(bfsEdges.Count == bfsExpectedSources.Length);
for (int i = 0; i < bfsEdges.Count; i++)
{
Assert.IsTrue(bfsEdges[i].Source == bfsExpectedSources[i]);
Assert.IsTrue(bfsEdges[i].Destination == bfsExpectedDestinations[i]);
}
// Expected bfs for vertex 8:
// 8 | 5 7 | 2 | 4 | 1 | 3 6
bfsExpectedOutput = new int[] { 8, 5, 7, 2, 4, 1, 3, 6 };
bfs = graph.BreadthFirstSearch(8).ToList();
Assert.IsTrue(bfs.Count == bfsExpectedOutput.Length);
for (int i = 0; i < bfs.Count; i++)
{
Assert.IsTrue(bfs[i] == bfsExpectedOutput[i]);
}
// Expected bfs edges for vertex 8:
// 8 8 | 5 | 7 | 2 | 4 4
// 5 7 | 2 | 4 | 1 | 3 6
bfsExpectedSources = new int[] { 8, 8, 5, 7, 2, 4, 4 };
bfsExpectedDestinations = new int[] { 5, 7, 2, 4, 1, 3, 6 };
bfsEdges = graph.BreadthFirstSearchEdges(8).ToList();
Assert.IsTrue(bfsEdges.Count == bfsExpectedSources.Length);
for (int i = 0; i < bfsEdges.Count; i++)
{
Assert.IsTrue(bfsEdges[i].Source == bfsExpectedSources[i]);
Assert.IsTrue(bfsEdges[i].Destination == bfsExpectedDestinations[i]);
}
}
public void CheckIfOutgoingEdgesAreCorrect()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
// Vertex 1 expected outgoing edges: 3 4
var expected = new int[] { 3, 4 };
var edges = graph.OutgoingEdgesSorted(1).ToList();
Assert.IsTrue(edges.Count == expected.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(edges[i].Destination == expected[i]);
}
// Vertex 5 expected outgoing edges: 2 7 8
expected = new int[] { 2, 7, 8 };
edges = graph.OutgoingEdgesSorted(5).ToList();
Assert.IsTrue(edges.Count == expected.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(edges[i].Destination == expected[i]);
}
// Vertex 7 expected outgoing edges: 4
expected = new int[] { 4 };
edges = graph.OutgoingEdgesSorted(7).ToList();
Assert.IsTrue(edges.Count == expected.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(edges[i].Destination == expected[i]);
}
}
public void RemovingVerticesAndCheckingIfRemovedProperly()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
Assert.IsTrue(graph.EdgesCount == 15);
Assert.IsTrue(graph.ContainsVertex(3));
Assert.IsTrue(graph.ContainsEdge(3, 2));
Assert.IsTrue(graph.ContainsEdge(3, 6));
Assert.IsTrue(graph.ContainsEdge(1, 3));
Assert.IsTrue(graph.ContainsEdge(4, 3));
graph.RemoveVertex(3);
Assert.IsFalse(graph.ContainsVertex(3));
Assert.IsFalse(graph.ContainsEdge(3, 2));
Assert.IsFalse(graph.ContainsEdge(3, 6));
Assert.IsFalse(graph.ContainsEdge(1, 3));
Assert.IsFalse(graph.ContainsEdge(4, 3));
Assert.IsTrue(graph.EdgesCount == 11);
Assert.IsTrue(graph.ContainsVertex(5));
Assert.IsTrue(graph.ContainsEdge(5, 2));
Assert.IsTrue(graph.ContainsEdge(5, 7));
Assert.IsTrue(graph.ContainsEdge(5, 8));
Assert.IsTrue(graph.ContainsEdge(2, 5));
Assert.IsTrue(graph.ContainsEdge(8, 5));
graph.RemoveVertex(5);
Assert.IsFalse(graph.ContainsVertex(5));
Assert.IsFalse(graph.ContainsEdge(5, 2));
Assert.IsFalse(graph.ContainsEdge(5, 7));
Assert.IsFalse(graph.ContainsEdge(5, 8));
Assert.IsFalse(graph.ContainsEdge(2, 5));
Assert.IsFalse(graph.ContainsEdge(8, 5));
Assert.IsTrue(graph.EdgesCount == 6);
}
public void CheckingIfVerticesAndEdgesAreAddedProperly()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedALGraph <int>();
graph.AddVertices(vertices);
Assert.IsTrue(graph.VerticesCount == vertices.Length);
foreach (var vertex in vertices)
{
Assert.IsTrue(graph.ContainsVertex(vertex));
}
// 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 <-
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 1);
graph.AddEdge(2, 5);
graph.AddEdge(3, 2);
graph.AddEdge(3, 6);
graph.AddEdge(4, 3);
graph.AddEdge(4, 6);
graph.AddEdge(5, 2);
graph.AddEdge(5, 7);
graph.AddEdge(5, 8);
graph.AddEdge(6, 2);
graph.AddEdge(7, 4);
graph.AddEdge(8, 5);
graph.AddEdge(8, 7);
Assert.IsTrue(graph.EdgesCount == 15);
Assert.IsTrue(graph.ContainsEdge(1, 3));
Assert.IsTrue(graph.ContainsEdge(1, 4));
Assert.IsTrue(graph.ContainsEdge(2, 1));
Assert.IsTrue(graph.ContainsEdge(2, 5));
Assert.IsTrue(graph.ContainsEdge(3, 2));
Assert.IsTrue(graph.ContainsEdge(3, 6));
Assert.IsTrue(graph.ContainsEdge(4, 3));
Assert.IsTrue(graph.ContainsEdge(4, 6));
Assert.IsTrue(graph.ContainsEdge(5, 2));
Assert.IsTrue(graph.ContainsEdge(5, 7));
Assert.IsTrue(graph.ContainsEdge(5, 8));
Assert.IsTrue(graph.ContainsEdge(6, 2));
Assert.IsTrue(graph.ContainsEdge(7, 4));
Assert.IsTrue(graph.ContainsEdge(8, 5));
Assert.IsTrue(graph.ContainsEdge(8, 7));
Assert.IsFalse(graph.ContainsEdge(1, 2));
Assert.IsFalse(graph.ContainsEdge(1, 5));
Assert.IsFalse(graph.ContainsEdge(1, 6));
Assert.IsFalse(graph.ContainsEdge(1, 7));
Assert.IsFalse(graph.ContainsEdge(1, 8));
Assert.IsFalse(graph.ContainsEdge(2, 3));
Assert.IsFalse(graph.ContainsEdge(2, 4));
Assert.IsFalse(graph.ContainsEdge(2, 6));
Assert.IsFalse(graph.ContainsEdge(2, 7));
Assert.IsFalse(graph.ContainsEdge(2, 8));
Assert.IsFalse(graph.ContainsEdge(3, 1));
Assert.IsFalse(graph.ContainsEdge(3, 4));
Assert.IsFalse(graph.ContainsEdge(3, 5));
Assert.IsFalse(graph.ContainsEdge(3, 7));
Assert.IsFalse(graph.ContainsEdge(3, 8));
Assert.IsFalse(graph.ContainsEdge(4, 1));
Assert.IsFalse(graph.ContainsEdge(4, 2));
Assert.IsFalse(graph.ContainsEdge(4, 5));
Assert.IsFalse(graph.ContainsEdge(4, 7));
Assert.IsFalse(graph.ContainsEdge(4, 8));
Assert.IsFalse(graph.ContainsEdge(5, 1));
Assert.IsFalse(graph.ContainsEdge(5, 3));
Assert.IsFalse(graph.ContainsEdge(5, 4));
Assert.IsFalse(graph.ContainsEdge(5, 6));
Assert.IsFalse(graph.ContainsEdge(6, 1));
Assert.IsFalse(graph.ContainsEdge(6, 3));
Assert.IsFalse(graph.ContainsEdge(6, 4));
Assert.IsFalse(graph.ContainsEdge(6, 5));
Assert.IsFalse(graph.ContainsEdge(6, 7));
Assert.IsFalse(graph.ContainsEdge(6, 8));
Assert.IsFalse(graph.ContainsEdge(7, 1));
Assert.IsFalse(graph.ContainsEdge(7, 2));
Assert.IsFalse(graph.ContainsEdge(7, 3));
Assert.IsFalse(graph.ContainsEdge(7, 5));
Assert.IsFalse(graph.ContainsEdge(7, 6));
Assert.IsFalse(graph.ContainsEdge(7, 8));
Assert.IsFalse(graph.ContainsEdge(8, 1));
Assert.IsFalse(graph.ContainsEdge(8, 2));
Assert.IsFalse(graph.ContainsEdge(8, 3));
Assert.IsFalse(graph.ContainsEdge(8, 4));
Assert.IsFalse(graph.ContainsEdge(8, 6));
}