}
    // Should overflow without throwing.
    accumulator.addAll(accumulator.snapshot());
    assertThat(accumulator.count()).isLessThan(0L);
  }

  public void testXStats() {
    assertStatsApproxEqual(EMPTY_STATS_ITERABLE, emptyAccumulator.xStats());
    assertStatsApproxEqual(EMPTY_STATS_ITERABLE, emptyAccumulatorByAddAllEmptyPairedStats.xStats());

        byte[] testMac = { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66 };
        System.arraycopy(testMac, 0, src, srcIndex + 19, 6);

        // Statistics (6 bytes)
        byte[] testStats = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
        System.arraycopy(testStats, 0, src, srcIndex + 25, 6);

        int result = response.readRDataWireFormat(src, srcIndex);
        assertEquals(31, result);

    CacheLoader<Object, Object> loader = identityLoader();
    tester.testAllPublicInstanceMethods(makeCache(createCacheBuilder(), loader));
  }

  // stats tests

  public void testStats() {
    CacheBuilder<Object, Object> builder = createCacheBuilder().concurrencyLevel(1).maximumSize(2);
    LocalLoadingCache<Object, Object> cache = makeCache(builder, identityLoader());