for (int n = 1; n < 1000; n++) {
      for (int m = 0; m < 1000; m++) {
        assertTrue(BloomFilter.optimalNumOfHashFunctions(n, m) > 0);
      }
    }
  }

  // https://code.google.com/p/guava-libraries/issues/detail?id=1781
  public void testOptimalNumOfHashFunctionsRounding() {
    assertEquals(7, BloomFilter.optimalNumOfHashFunctions(319, 3072));
  }

  /** Tests that we always get a non-negative optimal size. */