diff options
Diffstat (limited to 'third_party/abseil-cpp/absl/random/internal/explicit_seed_seq_test.cc')
-rw-r--r-- | third_party/abseil-cpp/absl/random/internal/explicit_seed_seq_test.cc | 49 |
1 files changed, 40 insertions, 9 deletions
diff --git a/third_party/abseil-cpp/absl/random/internal/explicit_seed_seq_test.cc b/third_party/abseil-cpp/absl/random/internal/explicit_seed_seq_test.cc index a55ad73948..f867f610d0 100644 --- a/third_party/abseil-cpp/absl/random/internal/explicit_seed_seq_test.cc +++ b/third_party/abseil-cpp/absl/random/internal/explicit_seed_seq_test.cc @@ -24,6 +24,8 @@ namespace { +using ::absl::random_internal::ExplicitSeedSeq; + template <typename Sseq> bool ConformsToInterface() { // Check that the SeedSequence can be default-constructed. @@ -64,14 +66,14 @@ TEST(SeedSequences, CheckInterfaces) { EXPECT_TRUE(ConformsToInterface<std::seed_seq>()); // Abseil classes - EXPECT_TRUE(ConformsToInterface<absl::random_internal::ExplicitSeedSeq>()); + EXPECT_TRUE(ConformsToInterface<ExplicitSeedSeq>()); } TEST(ExplicitSeedSeq, DefaultConstructorGeneratesZeros) { const size_t kNumBlocks = 128; uint32_t outputs[kNumBlocks]; - absl::random_internal::ExplicitSeedSeq seq; + ExplicitSeedSeq seq; seq.generate(outputs, &outputs[kNumBlocks]); for (uint32_t& seed : outputs) { @@ -87,8 +89,7 @@ TEST(ExplicitSeeqSeq, SeedMaterialIsForwardedIdentically) { for (uint32_t& seed : seed_material) { seed = urandom(); } - absl::random_internal::ExplicitSeedSeq seq(seed_material, - &seed_material[kNumBlocks]); + ExplicitSeedSeq seq(seed_material, &seed_material[kNumBlocks]); // Check that output is same as seed-material provided to constructor. { @@ -133,11 +134,10 @@ TEST(ExplicitSeedSeq, CopyAndMoveConstructors) { for (uint32_t& entry : entropy) { entry = urandom(); } - absl::random_internal::ExplicitSeedSeq seq_from_entropy(std::begin(entropy), - std::end(entropy)); + ExplicitSeedSeq seq_from_entropy(std::begin(entropy), std::end(entropy)); // Copy constructor. { - absl::random_internal::ExplicitSeedSeq seq_copy(seq_from_entropy); + ExplicitSeedSeq seq_copy(seq_from_entropy); EXPECT_EQ(seq_copy.size(), seq_from_entropy.size()); std::vector<uint32_t> seeds_1; @@ -155,8 +155,7 @@ TEST(ExplicitSeedSeq, CopyAndMoveConstructors) { for (uint32_t& entry : entropy) { entry = urandom(); } - absl::random_internal::ExplicitSeedSeq another_seq(std::begin(entropy), - std::end(entropy)); + ExplicitSeedSeq another_seq(std::begin(entropy), std::end(entropy)); std::vector<uint32_t> seeds_1; seeds_1.resize(1000, 0); @@ -202,3 +201,35 @@ TEST(ExplicitSeedSeq, CopyAndMoveConstructors) { EXPECT_THAT(seeds_1, Each(Eq(0))); } } + +TEST(ExplicitSeedSeq, StdURBGGoldenTests) { + // Verify that for std::- URBG instances the results are stable across + // platforms (these should have deterministic output). + { + ExplicitSeedSeq seed_sequence{12, 34, 56}; + std::minstd_rand rng(seed_sequence); + + std::minstd_rand::result_type values[4] = {rng(), rng(), rng(), rng()}; + EXPECT_THAT(values, + testing::ElementsAre(579252, 43785881, 464353103, 1501811174)); + } + + { + ExplicitSeedSeq seed_sequence{12, 34, 56}; + std::mt19937 rng(seed_sequence); + + std::mt19937::result_type values[4] = {rng(), rng(), rng(), rng()}; + EXPECT_THAT(values, testing::ElementsAre(138416803, 151130212, 33817739, + 138416803)); + } + + { + ExplicitSeedSeq seed_sequence{12, 34, 56}; + std::mt19937_64 rng(seed_sequence); + + std::mt19937_64::result_type values[4] = {rng(), rng(), rng(), rng()}; + EXPECT_THAT(values, + testing::ElementsAre(19738651785169348, 1464811352364190456, + 18054685302720800, 19738651785169348)); + } +} |