One implements CombinerAggregator<Integer> { @Override public Integer init(TridentTuple tuple) { return 1; }  @Override Integer init(TridentTuple tuple); @Override Integer combine(Integer val1, Integer val2); @Override Integer zero();  }
@Test public void testInit() throws Exception { TridentTuple tuple = mock(TridentTuple.class); assertThat(one.init(tuple)).isEqualTo(1); }