@Test
  public void testIncrementStream() {
    ObjectId streamId = new ObjectId();
    counter.countUpStream(streamId, 100);
    counter.incrementStream(streamId);

    int res = counter.getStreamCounts().get(streamId.toString());
    assertEquals(101, res);
  }
  @Test
  public void testGetStreamCounts() {
    ObjectId stream1 = new ObjectId();
    ObjectId stream2 = new ObjectId();
    ObjectId stream3 = new ObjectId();

    Map expected = new HashMap<String, Integer>();
    expected.put(stream1.toString(), 1);
    expected.put(stream2.toString(), 5);
    expected.put(stream3.toString(), 2);

    counter.countUpStream(stream1, 1);
    counter.countUpStream(stream2, 3);
    counter.countUpStream(stream2, 2);
    counter.countUpStream(stream3, 1);
    counter.incrementStream(stream3);

    assertEquals(expected, counter.getStreamCounts());
  }