### Question:
GraphMetrics { public static <V, E> double getRadius(Graph<V, E> graph) { return new GraphMeasurer<>(graph).getRadius(); }  static double getDiameter(Graph<V, E> graph); static double getRadius(Graph<V, E> graph); static int getGirth(Graph<V, E> graph);  }### Answer:
@Test public void testGraphRadius() { Graph<Integer, DefaultEdge> g = new SimpleGraph<>(DefaultEdge.class); double radius = GraphMetrics.getRadius(g); assertEquals(0.0, radius, EPSILON); }