public void RetrievesAllEdgesInTheGraph()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
node1.AddEdgeTo(node1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
node2.AddEdgeTo(node3);
node2.AddEdgeTo(node2);
graph.AddNode(node1);
graph.AddNode(node2);
List <EdgeListNode <int> > nodes = graph.AllNodes.ToList();
int count = nodes.Count;
Assert.Equal(3, count);
bool has1 = nodes.Contains(node1);
Assert.True(has1);
bool has2 = nodes.Contains(node2);
Assert.True(has2);
bool has3 = nodes.Contains(node3);
Assert.True(has3);
}
public void ProducesValidEdges()
{
//by value
//correct reference passed
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
Edge <EdgeListNode <int> > edge1 = node1.AddEdgeTo(1);
Edge <EdgeListNode <int> > addResult1 = node1.AddEdgeTo(1);
Assert.Equal(addResult1, edge1);
//coherent 'from' and 'to' nodes
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
Edge <EdgeListNode <int> > edge2 = node2.AddEdgeTo(1);
EdgeListNode <int> from = edge2.From;
EdgeListNode <int> to = edge2.To;
Assert.Equal(from, node2);
Assert.Equal(to.Value, 1);
//by node
//correct reference passed
node1 = new EdgeListNode <int>(1);
edge1 = node1.AddEdgeTo(node1);
addResult1 = node1.AddEdgeTo(node1);
Assert.Equal(addResult1, edge1);
//coherent 'from' and 'to' nodes
node2 = new EdgeListNode <int>(2);
edge2 = node2.AddEdgeTo(node1);
from = edge2.From;
to = edge2.To;
Assert.Equal(from, node2);
Assert.Equal(to, node1);
}
public void SortsCorrectlyGraphNodes()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = graph.AddNode(1);
EdgeListNode <int> node2 = graph.AddNode(2);
EdgeListNode <int> node3 = node2.AddEdgeTo(3).To;
EdgeListNode <int> node4 = node2.AddEdgeTo(4).To;
EdgeListNode <int> node5 = node4.AddEdgeTo(5).To;
List <EdgeListNode <int> > result = graph.TopologicalSort().ToList();
int index1 = result.IndexOf(node1);
int index2 = result.IndexOf(node2);
int index3 = result.IndexOf(node3);
int index4 = result.IndexOf(node4);
int index5 = result.IndexOf(node5);
Assert.True(index1 >= 0);
Assert.True(index2 >= 0);
Assert.True(index3 >= 0);
Assert.True(index4 >= 0);
Assert.True(index5 >= 0);
Assert.InRange(index1, 0, 1);
Assert.InRange(index2, 0, 1);
Assert.True(index1 < index3);
Assert.True(index1 < index4);
Assert.True(index2 < index3);
Assert.True(index2 < index4);
Assert.True(index3 < index5);
Assert.True(index4 < index5);
}
public void RetrievesCorrectData()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
EdgeListNode <int> node4 = new EdgeListNode <int>(4);
node1.AddEdgeTo(node1);
node2.AddEdgeTo(node3);
graph.AddNode(node1);
graph.AddNode(node2);
graph.AddNode(node4);
List <EdgeListNode <int> > nodes = graph.NodesWithoutIncomingEdges.ToList();
int count = nodes.Count;
Assert.Equal(2, count);
bool has2 = nodes.Contains(node2);
Assert.True(has2);
bool has4 = nodes.Contains(node4);
Assert.True(has4);
}
public void ThrowsOnCyclicalGraphs()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = graph.AddNode(1);
EdgeListNode <int> node2 = graph.AddNode(2);
node1.AddEdgeTo(node1);
node2.AddEdgeTo(3);
Assert.Throws <Exception>(() => { graph.TopologicalSort(); });
}
public void AddsANewEdges()
{
//by value
EdgeListNode <int> node = new EdgeListNode <int>(1);
node.AddEdgeTo(1);
bool added = node.HasEdgeTo(1);
Assert.True(added);
//by node
node = new EdgeListNode <int>(1);
node.AddEdgeTo(node);
added = node.HasEdgeTo(1);
Assert.True(added);
}
public void DetectsNegativesCases()
{
//by value
EdgeListNode <int> node = new EdgeListNode <int>(1);
node.AddEdgeTo(2);
bool hasEdgeToValue = node.HasEdgeTo(5);
Assert.False(hasEdgeToValue);
//by node
node = new EdgeListNode <int>(1);
EdgeListNode <int> neighbour = new EdgeListNode <int>(5);
bool hasEdgeToNode = node.HasEdgeTo(neighbour);
Assert.False(hasEdgeToNode);
}
public void DoesNotRetrieveNonExistingEdges()
{
//by value
EdgeListNode <int> node = new EdgeListNode <int>(1);
node.AddEdgeTo(2);
bool hasEdgeToValue = node.HasEdgeTo(5);
Assert.False(hasEdgeToValue);
//by node
node = new EdgeListNode <int>(1);
EdgeListNode <int> neighbour = new EdgeListNode <int>(5);
bool hasEdgeToNode = node.HasEdgeTo(neighbour);
Assert.False(hasEdgeToNode);
}
public void DoesNotAddOldEdges()
{
//by value
EdgeListNode <int> node = new EdgeListNode <int>(1);
node.AddEdgeTo(1);
node.AddEdgeTo(1);
int count = node.Edges.Count();
Assert.Equal(1, count);
//by node
node = new EdgeListNode <int>(1);
node.AddEdgeTo(node);
node.AddEdgeTo(node);
count = node.Edges.Count();
Assert.Equal(1, count);
}
public void RetreivesExistingEdges()
{
//by value
EdgeListNode <int> node = new EdgeListNode <int>(1);
node.AddEdgeTo(2);
Edge <EdgeListNode <int> > valueResult = node.FindEdgeTo(2);
Assert.NotNull(valueResult);
//by node
node = new EdgeListNode <int>(1);
EdgeListNode <int> neighbour = new EdgeListNode <int>(2);
node.AddEdgeTo(neighbour);
Edge <EdgeListNode <int> > nodeResult = node.FindEdgeTo(2);
Assert.NotNull(nodeResult);
}
public void DetectsPositiveCases()
{
//by value
EdgeListNode <int> node = new EdgeListNode <int>(1);
node.AddEdgeTo(2);
bool hasEdgeToValue = node.HasEdgeTo(2);
Assert.True(hasEdgeToValue);
//by node
node = new EdgeListNode <int>(1);
EdgeListNode <int> neighbour = new EdgeListNode <int>(2);
node.AddEdgeTo(neighbour);
bool hasEdgeToNode = node.HasEdgeTo(neighbour);
Assert.True(hasEdgeToNode);
}
public void DoesNotAddOldNodes()
{
//by node
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
node2.AddEdgeTo(node3);
graph.AddNode(node1);
graph.AddNode(node1);
graph.AddNode(node2);
graph.AddNode(node2);
List <EdgeListNode <int> > nodes = graph.Nodes.ToList();
int count = nodes.Count;
Assert.Equal(2, count);
bool has1 = nodes.Contains(node1);
Assert.True(has1);
bool has2 = nodes.Contains(node2);
Assert.True(has2);
//by value
graph = new EdgeListGraph <int>();
node1 = graph.AddNode(1);
node2 = graph.AddNode(2);
node2.AddEdgeTo(node3);
graph.AddNode(1);
graph.AddNode(1);
nodes = graph.Nodes.ToList();
count = nodes.Count;
Assert.Equal(2, count);
has1 = nodes.Contains(node1);
Assert.True(has1);
has2 = nodes.Contains(node2);
Assert.True(has2);
}
public void AddsNewEdges()
{
//by value
EdgeListGraph <int> graph = new EdgeListGraph <int>();
graph.AddNode(1);
graph.AddNode(2);
graph.AddDirectedEdge(1, 2);
int count = graph.AllEdges.Count();
Assert.Equal(1, count);
//by node
graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
graph.AddNode(node1);
graph.AddNode(node2);
graph.AddDirectedEdge(node1, node2);
count = graph.AllEdges.Count();
Assert.Equal(1, count);
}
public void FindsExistingNodes()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
node2.AddEdgeTo(node3);
graph.AddNode(node1);
graph.AddNode(node2);
EdgeListNode <int> result1, result2, result3;
//by value
result1 = graph.FindNode(1);
result2 = graph.FindNode(2);
result3 = graph.FindNode(3);
Assert.NotNull(result1);
Assert.NotNull(result2);
Assert.NotNull(result3);
//by node
result1 = graph.FindNode(node1);
result2 = graph.FindNode(node2);
result3 = graph.FindNode(node3);
Assert.NotNull(result1);
Assert.NotNull(result2);
Assert.NotNull(result3);
//by predicate
result1 = graph.FindNode(node => node.Value < 2);
result2 = graph.FindNode(node => Math.Pow(node.Value, 2) == 4);
result3 = graph.FindNode(node => node.Value > 2);
Assert.NotNull(result1);
Assert.NotNull(result2);
Assert.NotNull(result3);
}
public void DetectsNonExistingNodes()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
node2.AddEdgeTo(node3);
graph.AddNode(node1);
graph.AddNode(node2);
bool result;
//by value
result = graph.ContainsNode(12);
Assert.False(result);
//by node
result = graph.ContainsNode(new EdgeListNode <int>(12));
Assert.False(result);
//by predicate
result = graph.ContainsNode(node => node.Value >= 12);
Assert.False(result);
}
public void DetectsExistingNodes()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
node2.AddEdgeTo(node3);
graph.AddNode(node1);
graph.AddNode(node2);
bool result1, result2, result3;
//by value
result1 = graph.ContainsNode(1);
result2 = graph.ContainsNode(2);
result3 = graph.ContainsNode(3);
Assert.True(result1);
Assert.True(result2);
Assert.True(result3);
//by node
result1 = graph.ContainsNode(node1);
result2 = graph.ContainsNode(node2);
result3 = graph.ContainsNode(node3);
Assert.True(result1);
Assert.True(result2);
Assert.True(result3);
//by predicate
result1 = graph.ContainsNode(node => node.Value < 2);
result2 = graph.ContainsNode(node => Math.Pow(node.Value, 2) == 4);
result3 = graph.ContainsNode(node => node.Value > 2);
Assert.True(result1);
Assert.True(result2);
Assert.True(result3);
}
public void DoesNotFindNonExistingNodes()
{
EdgeListGraph <int> graph = new EdgeListGraph <int>();
EdgeListNode <int> node1 = new EdgeListNode <int>(1);
EdgeListNode <int> node2 = new EdgeListNode <int>(2);
EdgeListNode <int> node3 = new EdgeListNode <int>(3);
node2.AddEdgeTo(node3);
graph.AddNode(node1);
graph.AddNode(node2);
EdgeListNode <int> result;
//by value
result = graph.FindNode(12);
Assert.Null(result);
//by node
result = graph.FindNode(new EdgeListNode <int>(12));
Assert.Null(result);
//by predicate
result = graph.FindNode(node => node.Value >= 12);
Assert.Null(result);
}