@Test public void testComparator() { ConstantPostAggregator constantPostAggregator = new ConstantPostAggregator("thistestbasicallydoesnothing unhappyface", 1); Comparator comp = constantPostAggregator.getComparator(); Assert.assertEquals(0, comp.compare(0, constantPostAggregator.compute(null))); Assert.assertEquals(0, comp.compare(0, 1)); Assert.assertEquals(0, comp.compare(1, 0)); }