diff options
Diffstat (limited to 'absl/random/distributions_test.cc')
| -rw-r--r-- | absl/random/distributions_test.cc | 142 |
1 files changed, 54 insertions, 88 deletions
diff --git a/absl/random/distributions_test.cc b/absl/random/distributions_test.cc index 2d92723a..5866a072 100644 --- a/absl/random/distributions_test.cc +++ b/absl/random/distributions_test.cc @@ -29,94 +29,6 @@ constexpr int kSize = 400000; class RandomDistributionsTest : public testing::Test {}; -TEST_F(RandomDistributionsTest, UniformBoundFunctions) { - using absl::IntervalClosedClosed; - using absl::IntervalClosedOpen; - using absl::IntervalOpenClosed; - using absl::IntervalOpenOpen; - using absl::random_internal::uniform_lower_bound; - using absl::random_internal::uniform_upper_bound; - - // absl::uniform_int_distribution natively assumes IntervalClosedClosed - // absl::uniform_real_distribution natively assumes IntervalClosedOpen - - EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, 0, 100), 1); - EXPECT_EQ(uniform_lower_bound(IntervalOpenOpen, 0, 100), 1); - EXPECT_GT(uniform_lower_bound<float>(IntervalOpenClosed, 0, 1.0), 0); - EXPECT_GT(uniform_lower_bound<float>(IntervalOpenOpen, 0, 1.0), 0); - EXPECT_GT(uniform_lower_bound<double>(IntervalOpenClosed, 0, 1.0), 0); - EXPECT_GT(uniform_lower_bound<double>(IntervalOpenOpen, 0, 1.0), 0); - - EXPECT_EQ(uniform_lower_bound(IntervalClosedClosed, 0, 100), 0); - EXPECT_EQ(uniform_lower_bound(IntervalClosedOpen, 0, 100), 0); - EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedClosed, 0, 1.0), 0); - EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedOpen, 0, 1.0), 0); - EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedClosed, 0, 1.0), 0); - EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedOpen, 0, 1.0), 0); - - EXPECT_EQ(uniform_upper_bound(IntervalOpenOpen, 0, 100), 99); - EXPECT_EQ(uniform_upper_bound(IntervalClosedOpen, 0, 100), 99); - EXPECT_EQ(uniform_upper_bound<float>(IntervalOpenOpen, 0, 1.0), 1.0); - EXPECT_EQ(uniform_upper_bound<float>(IntervalClosedOpen, 0, 1.0), 1.0); - EXPECT_EQ(uniform_upper_bound<double>(IntervalOpenOpen, 0, 1.0), 1.0); - EXPECT_EQ(uniform_upper_bound<double>(IntervalClosedOpen, 0, 1.0), 1.0); - - EXPECT_EQ(uniform_upper_bound(IntervalOpenClosed, 0, 100), 100); - EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, 0, 100), 100); - EXPECT_GT(uniform_upper_bound<float>(IntervalOpenClosed, 0, 1.0), 1.0); - EXPECT_GT(uniform_upper_bound<float>(IntervalClosedClosed, 0, 1.0), 1.0); - EXPECT_GT(uniform_upper_bound<double>(IntervalOpenClosed, 0, 1.0), 1.0); - EXPECT_GT(uniform_upper_bound<double>(IntervalClosedClosed, 0, 1.0), 1.0); - - // Negative value tests - EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, -100, -1), -99); - EXPECT_EQ(uniform_lower_bound(IntervalOpenOpen, -100, -1), -99); - EXPECT_GT(uniform_lower_bound<float>(IntervalOpenClosed, -2.0, -1.0), -2.0); - EXPECT_GT(uniform_lower_bound<float>(IntervalOpenOpen, -2.0, -1.0), -2.0); - EXPECT_GT(uniform_lower_bound<double>(IntervalOpenClosed, -2.0, -1.0), -2.0); - EXPECT_GT(uniform_lower_bound<double>(IntervalOpenOpen, -2.0, -1.0), -2.0); - - EXPECT_EQ(uniform_lower_bound(IntervalClosedClosed, -100, -1), -100); - EXPECT_EQ(uniform_lower_bound(IntervalClosedOpen, -100, -1), -100); - EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedClosed, -2.0, -1.0), -2.0); - EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedOpen, -2.0, -1.0), -2.0); - EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedClosed, -2.0, -1.0), - -2.0); - EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedOpen, -2.0, -1.0), -2.0); - - EXPECT_EQ(uniform_upper_bound(IntervalOpenOpen, -100, -1), -2); - EXPECT_EQ(uniform_upper_bound(IntervalClosedOpen, -100, -1), -2); - EXPECT_EQ(uniform_upper_bound<float>(IntervalOpenOpen, -2.0, -1.0), -1.0); - EXPECT_EQ(uniform_upper_bound<float>(IntervalClosedOpen, -2.0, -1.0), -1.0); - EXPECT_EQ(uniform_upper_bound<double>(IntervalOpenOpen, -2.0, -1.0), -1.0); - EXPECT_EQ(uniform_upper_bound<double>(IntervalClosedOpen, -2.0, -1.0), -1.0); - - EXPECT_EQ(uniform_upper_bound(IntervalOpenClosed, -100, -1), -1); - EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, -100, -1), -1); - EXPECT_GT(uniform_upper_bound<float>(IntervalOpenClosed, -2.0, -1.0), -1.0); - EXPECT_GT(uniform_upper_bound<float>(IntervalClosedClosed, -2.0, -1.0), -1.0); - EXPECT_GT(uniform_upper_bound<double>(IntervalOpenClosed, -2.0, -1.0), -1.0); - EXPECT_GT(uniform_upper_bound<double>(IntervalClosedClosed, -2.0, -1.0), - -1.0); - - // Edge cases: the next value toward itself is itself. - const double d = 1.0; - const float f = 1.0; - EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, d, d), d); - EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, f, f), f); - - EXPECT_GT(uniform_lower_bound(IntervalOpenClosed, 1.0, 2.0), 1.0); - EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, +0.0), 1.0); - EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, -0.0), 1.0); - EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, -1.0), 1.0); - - EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, 0.0f, - std::numeric_limits<float>::max()), - std::numeric_limits<float>::max()); - EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, 0.0, - std::numeric_limits<double>::max()), - std::numeric_limits<double>::max()); -} struct Invalid {}; @@ -284,7 +196,9 @@ TEST_F(RandomDistributionsTest, UniformTypeInference) { // Properly promotes float. CheckArgsInferType<float, double, double>(); +} +TEST_F(RandomDistributionsTest, UniformExamples) { // Examples. absl::InsecureBitGen gen; EXPECT_NE(1, absl::Uniform(gen, static_cast<uint16_t>(0), 1.0f)); @@ -307,6 +221,58 @@ TEST_F(RandomDistributionsTest, UniformNoBounds) { absl::Uniform<uint64_t>(gen); } +TEST_F(RandomDistributionsTest, UniformNonsenseRanges) { + // The ranges used in this test are undefined behavior. + // The results are arbitrary and subject to future changes. + absl::InsecureBitGen gen; + + // <uint> + EXPECT_EQ(0, absl::Uniform<uint64_t>(gen, 0, 0)); + EXPECT_EQ(1, absl::Uniform<uint64_t>(gen, 1, 0)); + EXPECT_EQ(0, absl::Uniform<uint64_t>(absl::IntervalOpenOpen, gen, 0, 0)); + EXPECT_EQ(1, absl::Uniform<uint64_t>(absl::IntervalOpenOpen, gen, 1, 0)); + + constexpr auto m = (std::numeric_limits<uint64_t>::max)(); + + EXPECT_EQ(m, absl::Uniform(gen, m, m)); + EXPECT_EQ(m, absl::Uniform(gen, m, m - 1)); + EXPECT_EQ(m - 1, absl::Uniform(gen, m - 1, m)); + EXPECT_EQ(m, absl::Uniform(absl::IntervalOpenOpen, gen, m, m)); + EXPECT_EQ(m, absl::Uniform(absl::IntervalOpenOpen, gen, m, m - 1)); + EXPECT_EQ(m - 1, absl::Uniform(absl::IntervalOpenOpen, gen, m - 1, m)); + + // <int> + EXPECT_EQ(0, absl::Uniform<int64_t>(gen, 0, 0)); + EXPECT_EQ(1, absl::Uniform<int64_t>(gen, 1, 0)); + EXPECT_EQ(0, absl::Uniform<int64_t>(absl::IntervalOpenOpen, gen, 0, 0)); + EXPECT_EQ(1, absl::Uniform<int64_t>(absl::IntervalOpenOpen, gen, 1, 0)); + + constexpr auto l = (std::numeric_limits<int64_t>::min)(); + constexpr auto r = (std::numeric_limits<int64_t>::max)(); + + EXPECT_EQ(l, absl::Uniform(gen, l, l)); + EXPECT_EQ(r, absl::Uniform(gen, r, r)); + EXPECT_EQ(r, absl::Uniform(gen, r, r - 1)); + EXPECT_EQ(r - 1, absl::Uniform(gen, r - 1, r)); + EXPECT_EQ(l, absl::Uniform(absl::IntervalOpenOpen, gen, l, l)); + EXPECT_EQ(r, absl::Uniform(absl::IntervalOpenOpen, gen, r, r)); + EXPECT_EQ(r, absl::Uniform(absl::IntervalOpenOpen, gen, r, r - 1)); + EXPECT_EQ(r - 1, absl::Uniform(absl::IntervalOpenOpen, gen, r - 1, r)); + + // <double> + const double e = std::nextafter(1.0, 2.0); // 1 + epsilon + const double f = std::nextafter(1.0, 0.0); // 1 - epsilon + const double g = std::numeric_limits<double>::denorm_min(); + + EXPECT_EQ(1.0, absl::Uniform(gen, 1.0, e)); + EXPECT_EQ(1.0, absl::Uniform(gen, 1.0, f)); + EXPECT_EQ(0.0, absl::Uniform(gen, 0.0, g)); + + EXPECT_EQ(e, absl::Uniform(absl::IntervalOpenOpen, gen, 1.0, e)); + EXPECT_EQ(f, absl::Uniform(absl::IntervalOpenOpen, gen, 1.0, f)); + EXPECT_EQ(g, absl::Uniform(absl::IntervalOpenOpen, gen, 0.0, g)); +} + // TODO(lar): Validate properties of non-default interval-semantics. TEST_F(RandomDistributionsTest, UniformReal) { std::vector<double> values(kSize); |