@Override
  public FinishedTriggersSet copy() {
    return fromSet(Sets.newHashSet(finishedTriggers));
  }
@Test
  public void testCopy() throws Exception {
    FinishedTriggersSet finishedSet = FinishedTriggersSet.fromSet(new HashSet<>());
    assertThat(
        finishedSet.copy().getFinishedTriggers(),
        not(theInstance(finishedSet.getFinishedTriggers())));
  }