public void TestSourceAndTargetIsDirectlyConnected()
{
// naming scheme for nodes is "nx" where
// "n" is short for node and "x" is the char value
var ns = new Node <int, char>('s'); // source node
var nt = new Node <int, char>('t'); // target node
var nodes = new List <Node <int, char> > {
ns, nt
};
// naming scheme for edges is "exy"
// where "e" is short for "edge",
// "x" corresponds to the origin node and
// "y" corresponds to the destination node
var est = new Edge <int, char>(ns, nt, 100);
ns.AddEdge(est);
var calc = new Calculator <int>();
var expectedPath = new List <Node <int, char> > {
ns, nt
};
var expectedLength = est.Cost;
var dijkstra = new SingleShortestPath <int, char>(nodes, ns, nt, calc);
dijkstra.DijkstraSingleShortestPath();
var result = dijkstra.ShortestPath;
var length = dijkstra.ShortestPathDistance;
Assert.AreEqual(expectedLength, length);
CollectionAssert.AreEqual(expectedPath, result);
}
public void TestSourceHasSimplePathToTarget()
{
// naming scheme for nodes is "nx" where
// "n" is short for node and "x" is the char value
var ns = new Node <int, char>('s'); // source node
var n1 = new Node <int, char>('1');
var n2 = new Node <int, char>('2');
var n3 = new Node <int, char>('3');
var nt = new Node <int, char>('t'); // source node
var nodes = new List <Node <int, char> > {
ns, n1, n2, n3, nt
};
// naming scheme for edges is "exy"
// where "e" is short for "edge",
// "x" corresponds to the origin node and
// "y" corresponds to the destination node
var es1 = new Edge <int, char>(ns, n1, 1);
var e12 = new Edge <int, char>(n1, n2, 2);
var e23 = new Edge <int, char>(n2, n3, 3);
var e3t = new Edge <int, char>(n3, nt, 4);
ns.AddEdge(es1);
n1.AddEdge(e12);
n2.AddEdge(e23);
n3.AddEdge(e3t);
var calc = new Calculator <int>();
// simple path through a long thin line of nodes
var expectedPath = new List <Node <int, char> > {
ns, n1, n2, n3, nt
};
var expectedLength = es1.Cost + e12.Cost + e23.Cost + e3t.Cost;
var dijkstra = new SingleShortestPath <int, char>(nodes, ns, nt, calc);
dijkstra.DijkstraSingleShortestPath();
var result = dijkstra.ShortestPath;
var length = dijkstra.ShortestPathDistance;
Assert.AreEqual(expectedLength, length);
CollectionAssert.AreEqual(expectedPath, result);
}
public void TestSourceTargetIsSameNode()
{
// naming scheme for nodes is "nx" where
// "n" is short for node and "x" is the char value
var nst = new Node <int, char>('s'); // source node and target node
var nodes = new List <Node <int, char> > {
nst
};
var calc = new Calculator <int>();
var expectedPath = new List <Node <int, char> > {
nst
};
var expectedLength = 0; // no movement means no costs
var dijkstra = new SingleShortestPath <int, char>(nodes, nst, nst, calc);
dijkstra.DijkstraSingleShortestPath();
var result = dijkstra.ShortestPath;
var length = dijkstra.ShortestPathDistance;
Assert.AreEqual(expectedLength, length);
CollectionAssert.AreEqual(expectedPath, result);
}
public void TestComplexGraphWithIntsGraphParam()
{
/*
* (s)------5----->(1)------15---->(2)
| \ / \ ↗ |
| \ / \ / |
| 8 4 12 3 |
| \ / \ / |
| ↘ ↙ ↘ / |
| 9 (3)------7----->(4) 9
| ↗ \ ↗ \ |
| / \ / \ |
| 5 6 1 11 |
| / \ / \ |
| ↓ / ↘ / ↘ ↓
| (6)------4----->(5)-----13----->(t)
|
| Shortest path: s - 6 - 5 - 4 - t
| Cost: 9 + 4 + 1 + 11 = 25
|
*/
// naming scheme for nodes is "nx" where
// "n" is short for node and "x" is the char value
var ns = new Node <int, char>('s'); // source node
var n1 = new Node <int, char>('1');
var n2 = new Node <int, char>('2');
var n3 = new Node <int, char>('3');
var n4 = new Node <int, char>('4');
var n5 = new Node <int, char>('5');
var n6 = new Node <int, char>('6');
var nt = new Node <int, char>('t'); // target node
var nodes = new List <Node <int, char> > {
ns, n1, n2, n3, n4, n5, n6, nt
};
// naming scheme for edges is "exy"
// where "e" is short for "edge",
// "x" corresponds to the origin node and
// "y" corresponds to the destination node
var es1 = new Edge <int, char>(ns, n1, 5);
var es3 = new Edge <int, char>(ns, n3, 8);
var es6 = new Edge <int, char>(ns, n6, 9);
var e12 = new Edge <int, char>(n1, n2, 15);
var e13 = new Edge <int, char>(n1, n3, 4);
var e14 = new Edge <int, char>(n1, n4, 12);
var e2t = new Edge <int, char>(n2, nt, 9);
var e34 = new Edge <int, char>(n3, n4, 7);
var e35 = new Edge <int, char>(n3, n5, 6);
var e4t = new Edge <int, char>(n4, nt, 11);
var e54 = new Edge <int, char>(n5, n4, 1);
var e5t = new Edge <int, char>(n5, nt, 13);
var e63 = new Edge <int, char>(n6, n3, 5);
var e65 = new Edge <int, char>(n6, n5, 4);
var e6t = new Edge <int, char>(n6, nt, 20);
ns.AddEdge(es1);
ns.AddEdge(es3);
ns.AddEdge(es6);
n1.AddEdge(e12);
n1.AddEdge(e13);
n1.AddEdge(e14);
n2.AddEdge(e2t);
n3.AddEdge(e34);
n3.AddEdge(e35);
n4.AddEdge(e4t);
n5.AddEdge(e54);
n5.AddEdge(e5t);
n6.AddEdge(e63);
n6.AddEdge(e65);
n6.AddEdge(e6t);
var graph = new Graph <int, char>(nodes, ns, nt);
var calc = new Calculator <int>();
var expectedPath = new List <Node <int, char> > {
ns, n6, n5, n4, nt
};
var expectedCost = es6.Cost + e65.Cost + e54.Cost + e4t.Cost;
var dijkstra = new SingleShortestPath <int, char>(graph, calc);
dijkstra.DijkstraSingleShortestPath();
var result = dijkstra.ShortestPath;
var length = dijkstra.ShortestPathDistance;
Assert.AreEqual(expectedCost, length);
CollectionAssert.AreEqual(expectedPath, result);
}