TEST(BloomFilterTest, NumEntriesAndFalsePositiveRate)
{
BloomFilter* bf = BloomFilter::for_num_entries_and_fp_prob(2, 0.0001);
bf->add("Kermit");
bf->add("MissPiggy");
EXPECT_TRUE(bf->check("Kermit"));
EXPECT_TRUE(bf->check("MissPiggy"));
EXPECT_FALSE(bf->check("Gonzo"));
EXPECT_FALSE(bf->check("Animal"));
delete bf; bf = nullptr;
}
TEST(BloomFilterTest, JsonDeserialize3rdParty)
{
// A bloom filter that conforms to the JSON API but was generated by an
// independent 3rd party implementation. It contains the strings "Kermit" and
// "MissPiggy".
const std::string json =
"{\"bitmap\":\"J+i5Mg==\",\"total_bits\":32,\"bits_per_entry\":12,"
"\"hash0\":{\"k0\":6547054200929830170,\"k1\":9813628641652032020},"
"\"hash1\":{\"k0\":15888472079188754020,\"k1\":14822504794822470401}}";
BloomFilter* bf = BloomFilter::from_json(json);
EXPECT_NE(bf, nullptr);
EXPECT_TRUE(bf->check("Kermit"));
EXPECT_TRUE(bf->check("MissPiggy"));
EXPECT_FALSE(bf->check("Gonzo"));
EXPECT_FALSE(bf->check("Animal"));
delete bf; bf = nullptr;
}
TEST(BloomFilterTest, JsonDeserializeExtraFields)
{
// A bloom filter that contains some additional fields that our implementation
// does not recognize. This should be accepted, as it represents a
// backwards-compatible change to the filter.
const std::string json =
"{\"bitmap\":\"J+i5Mg==\",\"total_bits\":32,\"bits_per_entry\":12,"
"\"hash0\":{\"k0\":6547054200929830170,\"k1\":9813628641652032020},"
"\"hash1\":{\"k0\":15888472079188754020,\"k1\":14822504794822470401},"
"\"future\": \"unknown\"}";
BloomFilter* bf = BloomFilter::from_json(json);
EXPECT_NE(bf, nullptr);
EXPECT_TRUE(bf->check("Kermit"));
EXPECT_TRUE(bf->check("MissPiggy"));
EXPECT_FALSE(bf->check("Gonzo"));
EXPECT_FALSE(bf->check("Animal"));
delete bf; bf = nullptr;
}