public void CountDescendants_TwoVerticesCalledOnParentAfterCallToExistsDirectedPath_ReturnsOne()
{
var dag = new CachedDAG(2);
dag.AddEdge(0, 1);
dag.ExistsDirectedPath(0, 1);
int numDescendants = dag.CountDescendants(0);
Assert.That(numDescendants, Is.EqualTo(1));
}
public void CountDescendants_ThreeVerticesCalledOnRootAfterCallToExistsDirectedPath_ReturnsTwo()
{
var dag = new CachedDAG(3);
dag.AddEdge(0, 1);
dag.AddEdge(0, 2);
dag.ExistsDirectedPath(0, 1);
int numDescendants = dag.CountDescendants(0);
Assert.That(numDescendants, Is.EqualTo(2));
}
public void CountDescendants_DiamondDAGCalledOnApexAfterCallToExistsDirectedPath_ReturnsThree()
{
var dag = new CachedDAG(4);
dag.AddEdge(0, 1); // 0
dag.AddEdge(0, 2); // / \
dag.AddEdge(1, 3); // 1 2
dag.AddEdge(2, 3); // \ /
// 3
dag.ExistsDirectedPath(0, 1);
int numDescendants = dag.CountDescendants(0);
Assert.That(numDescendants, Is.EqualTo(3));
}