public void ShortedPathsWithSeveralEdges(int vertexTo, double expectedWeight)
{
WeightedDiGraph <int> directedGraph = new WeightedDiGraph <int>
{
new WeightedEdge <int>(0, 2, 0.26),
new WeightedEdge <int>(0, 4, 0.38),
new WeightedEdge <int>(2, 7, 0.34),
new WeightedEdge <int>(4, 5, 0.35),
new WeightedEdge <int>(5, 4, 0.35),
new WeightedEdge <int>(4, 7, 0.37),
new WeightedEdge <int>(5, 7, 0.28),
new WeightedEdge <int>(7, 5, 0.28),
new WeightedEdge <int>(7, 3, 0.39),
new WeightedEdge <int>(1, 3, 0.29),
new WeightedEdge <int>(6, 2, 0.40),
new WeightedEdge <int>(6, 0, 0.58),
new WeightedEdge <int>(6, 4, 0.93),
new WeightedEdge <int>(5, 1, 0.32),
new WeightedEdge <int>(3, 6, 0.52)
};
GraphShortestPaths <int> shortestPaths = new GraphShortestPaths <int>(0, directedGraph);
IList <WeightedEdge <int> > shortestPath = shortestPaths.GetShortestPath(vertexTo).ToList();
Assert.AreEqual(expectedWeight, Math.Round(shortestPath.Sum(x => x.Weight), 2));
}
public void ShortestPathsWithOneEdgeLength()
{
WeightedDiGraph <int> directedGraph = new WeightedDiGraph <int>
{
new WeightedEdge <int>(0, 1, 10),
new WeightedEdge <int>(0, 2, 5),
new WeightedEdge <int>(0, 3, 7)
};
GraphShortestPaths <int> shortestPaths = new GraphShortestPaths <int>(0, directedGraph);
IList <WeightedEdge <int> > shortestPath = shortestPaths.GetShortestPath(1).ToList();
Assert.AreEqual(1, shortestPath.Count, "Shortest path count");
Assert.AreEqual(new WeightedEdge <int>(0, 1, 10), shortestPath[0]);
shortestPath = shortestPaths.GetShortestPath(2).ToList();
Assert.AreEqual(1, shortestPath.Count, "Shortest path count");
Assert.AreEqual(new WeightedEdge <int>(0, 2, 5), shortestPath[0]);
shortestPath = shortestPaths.GetShortestPath(3).ToList();
Assert.AreEqual(1, shortestPath.Count, "Shortest path count");
Assert.AreEqual(new WeightedEdge <int>(0, 3, 7), shortestPath[0]);
}
public void ShortestPathsEmptyInNotConnectedGraph()
{
WeightedDiGraph <int> directedGraph = new WeightedDiGraph <int>
{
new WeightedEdge <int>(0, 1, 10),
new WeightedEdge <int>(0, 2, 10),
new WeightedEdge <int>(0, 4, 10)
};
GraphShortestPaths <int> shortestPaths = new GraphShortestPaths <int>(1, directedGraph);
Assert.AreEqual(0, shortestPaths.GetShortestPath(0).Count);
Assert.AreEqual(0, shortestPaths.GetShortestPath(2).Count);
Assert.AreEqual(0, shortestPaths.GetShortestPath(4).Count);
}
public void ShortestPathDoesnotContainEmptyEdge()
{
WeightedDiGraph <int> directedGraph = new WeightedDiGraph <int>
{
new WeightedEdge <int>(0, 1, 10),
new WeightedEdge <int>(0, 2, 10),
new WeightedEdge <int>(1, 3, 10),
new WeightedEdge <int>(0, 4, 10)
};
GraphShortestPaths <int> shortestPaths = new GraphShortestPaths <int>(0, directedGraph);
Assert.AreEqual(2, shortestPaths.GetShortestPath(3).Count);
CollectionAssert.DoesNotContain((ICollection)shortestPaths.GetShortestPath(3), WeightedEdge <int> .None);
}
public void ShortestPathsWithFiveEdges()
{
WeightedDiGraph <int> directedGraph = new WeightedDiGraph <int>
{
new WeightedEdge <int>(1, 2, 7),
new WeightedEdge <int>(1, 3, 9),
new WeightedEdge <int>(2, 4, 15),
new WeightedEdge <int>(2, 3, 10),
new WeightedEdge <int>(3, 4, 11)
};
GraphShortestPaths <int> shortestPaths = new GraphShortestPaths <int>(1, directedGraph);
IList <WeightedEdge <int> > shortestPath = shortestPaths.GetShortestPath(4).ToList();
Assert.AreEqual(20, shortestPath.Sum(x => x.Weight));
}
public void ShortestPathWithSymbolicLabelsGraph()
{
WeightedDiGraph <char> directedGraph = new WeightedDiGraph <char>
{
new WeightedEdge <char>('A', 'B', 1),
new WeightedEdge <char>('B', 'C', 2),
new WeightedEdge <char>('A', 'C', 4)
};
GraphShortestPaths <char> shortestPaths = new GraphShortestPaths <char>('A', directedGraph);
ICollection <WeightedEdge <char> > shortestPath = shortestPaths.GetShortestPath('C');
Assert.AreEqual(2, shortestPath.Count, "Count");
Assert.AreEqual(new WeightedEdge <char>('A', 'B', 1), shortestPath.ElementAt(0));
Assert.AreEqual(new WeightedEdge <char>('B', 'C', 2), shortestPath.ElementAt(1));
}