});

    assertFalse(bf2.isCompatible(bf1));
    assertThrows(
        IllegalArgumentException.class,
        () -> {
          bf2.putAll(bf1);
        });
  }

  public void testPutAllWithSelf() {
    BloomFilter<Integer> bf1 = BloomFilter.create(Funnels.integerFunnel(), 1);
    assertFalse(bf1.isCompatible(bf1));
    assertThrows(
        IllegalArgumentException.class,
        () -> {