public void ImmediateDescendantsReturnsChildrenOfTheNode(int node, int[] expectedImmediateDescendants)
        {
            var graph = GraphTestHelper.CreateExampleGraph_ForImmediateTests(TargetGraph);

            GraphTestHelper.AssertCollectionsConsistsOfNodes(expectedImmediateDescendants, graph.Find(node).ImmediateDescendants);
            GraphTestHelper.AssertNodesAreOrderedByLevel(graph.Find(node).ImmediateDescendants);
        }