@Test
public void testCopyConstructor() {

    RouterLevelHistogram p = RouterLevelHistogram.makeAverageHistogram(histogram);
    RouterLevelHistogram q = new RouterLevelHistogram(p);
    assertEquals(p, q);
    q.remove("00:01:02:03:04:05");
    assertEquals(3, p.size());
    assertEquals(2, q.size());
}