@Test
public void counterStore() {
final Counter.Key key = new Counter.Key(new Role("r", Unit.UNARY), "n");
// note: the input data are maybe not that consistent (min > max) but this test just checks computations
final CollectorCounterStore store = new InMemoryCollectorCounterStore();
store.update(key, "client1", new M2AwareStatisticalSummary(1, 2, 5, 0, 10, 6, 7), 4);
store.update(key, "client2", new M2AwareStatisticalSummary(2, 4, 8, 1, 15, 9, 5), 2);
assertEquals(2, store.markers().size());
assertTrue(store.markers().contains("client1"));
assertTrue(store.markers().contains("client2"));
final Counter counter1 = store.getCounters("client1").iterator().next();
assertEquals(4, counter1.getMaxConcurrency());
assertEquals(4, counter1.currentConcurrency().get());
assertEquals(5, counter1.getHits());
assertEquals(10., counter1.getMin(), 0);
assertEquals(0., counter1.getMax(), 0);
assertEquals(1.4142, counter1.getStandardDeviation(), 0.001);
assertEquals(2., counter1.getVariance(), 0);
assertEquals(6., counter1.getSum(), 0);
final Counter counter2 = store.getCounters("client2").iterator().next();
assertEquals(2, counter2.getMaxConcurrency());
assertEquals(2, counter2.currentConcurrency().get());
assertEquals(8, counter2.getHits());
assertEquals(15., counter2.getMin(), 0);
assertEquals(1., counter2.getMax(), 0);
assertEquals(2., counter2.getStandardDeviation(), 0.);
assertEquals(4., counter2.getVariance(), 0);
assertEquals(9., counter2.getSum(), 0);
final Counter aggregate = store.getOrCreateCounter(key);
assertEquals(6, aggregate.getMaxConcurrency());
assertEquals(6, aggregate.currentConcurrency().get());
assertEquals(13, aggregate.getHits());
assertEquals(10., aggregate.getMin(), 0);
assertEquals(1., aggregate.getMax(), 0);