new EqualsTester().addEqualityGroup(bf1, bf2).testEquals();

    bf2.put("3");

    new EqualsTester().addEqualityGroup(bf1).addEqualityGroup(bf2).testEquals();
  }

  public void testEqualsWithCustomFunnel() {
    BloomFilter<Long> bf1 = BloomFilter.create(new CustomFunnel(), 100);
    BloomFilter<Long> bf2 = BloomFilter.create(new CustomFunnel(), 100);
    assertEquals(bf1, bf2);
  }