@Test
public void testSize() {

    final int expectSize = ThreadLocalRandom.current().nextInt(1, 100);
    final ExpirableBloomFilterConfig config = new ExpirableBloomFilterConfig();
    for (int i = 0; i < expectSize; i++) {
        manager.createFilter(numberString(i), config);
    }
    assertThat(manager.size()).isEqualTo(expectSize);
}