TestCalculateGraphMetrics()
{
// Empty directed graph.
Boolean bIsDirected = true;
CreateGraph(bIsDirected);
Nullable<Double> dReciprocatedVertexPairRatio, dReciprocatedEdgeRatio;
m_oOverallReciprocationCalculator.CalculateGraphMetrics(m_oGraph,
out dReciprocatedVertexPairRatio, out dReciprocatedEdgeRatio);
Assert.IsFalse(dReciprocatedVertexPairRatio.HasValue);
Assert.IsFalse(dReciprocatedEdgeRatio.HasValue);
}