BloomFilter<String> copy = original.copy();
    assertThat(copy).isNotSameInstanceAs(original);
    assertEquals(original, copy);
  }

  public void testExpectedFpp() {
    BloomFilter<Object> bf = BloomFilter.create(HashTestUtils.BAD_FUNNEL, 10, 0.03);
    double fpp = bf.expectedFpp();
    assertThat(fpp).isEqualTo(0.0);
    // usually completed in less than 200 iterations