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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/util/random_test.cc | |
parent | Initial commit. (diff) | |
download | ceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz ceph-e6918187568dbd01842d8d1d2c808ce16a894239.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/util/random_test.cc | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/rocksdb/util/random_test.cc b/src/rocksdb/util/random_test.cc new file mode 100644 index 000000000..1aa62c5da --- /dev/null +++ b/src/rocksdb/util/random_test.cc @@ -0,0 +1,107 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). +// +// Copyright (c) 2012 The LevelDB Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "util/random.h" + +#include <cstring> +#include <vector> + +#include "test_util/testharness.h" + +using ROCKSDB_NAMESPACE::Random; + +TEST(RandomTest, Uniform) { + const int average = 20; + for (uint32_t seed : {0, 1, 2, 37, 4096}) { + Random r(seed); + for (int range : {1, 2, 8, 12, 100}) { + std::vector<int> counts(range, 0); + + for (int i = 0; i < range * average; ++i) { + ++counts.at(r.Uniform(range)); + } + int max_variance = static_cast<int>(std::sqrt(range) * 2 + 4); + for (int i = 0; i < range; ++i) { + EXPECT_GE(counts[i], std::max(1, average - max_variance)); + EXPECT_LE(counts[i], average + max_variance + 1); + } + } + } +} + +TEST(RandomTest, OneIn) { + Random r(42); + for (int range : {1, 2, 8, 12, 100, 1234}) { + const int average = 100; + int count = 0; + for (int i = 0; i < average * range; ++i) { + if (r.OneIn(range)) { + ++count; + } + } + if (range == 1) { + EXPECT_EQ(count, average); + } else { + int max_variance = static_cast<int>(std::sqrt(average) * 1.5); + EXPECT_GE(count, average - max_variance); + EXPECT_LE(count, average + max_variance); + } + } +} + +TEST(RandomTest, OneInOpt) { + Random r(42); + for (int range : {-12, 0, 1, 2, 8, 12, 100, 1234}) { + const int average = 100; + int count = 0; + for (int i = 0; i < average * range; ++i) { + if (r.OneInOpt(range)) { + ++count; + } + } + if (range < 1) { + EXPECT_EQ(count, 0); + } else if (range == 1) { + EXPECT_EQ(count, average); + } else { + int max_variance = static_cast<int>(std::sqrt(average) * 1.5); + EXPECT_GE(count, average - max_variance); + EXPECT_LE(count, average + max_variance); + } + } +} + +TEST(RandomTest, PercentTrue) { + Random r(42); + for (int pct : {-12, 0, 1, 2, 10, 50, 90, 98, 99, 100, 1234}) { + const int samples = 10000; + + int count = 0; + for (int i = 0; i < samples; ++i) { + if (r.PercentTrue(pct)) { + ++count; + } + } + if (pct <= 0) { + EXPECT_EQ(count, 0); + } else if (pct >= 100) { + EXPECT_EQ(count, samples); + } else { + int est = (count * 100 + (samples / 2)) / samples; + EXPECT_EQ(est, pct); + } + } +} + +int main(int argc, char** argv) { + ROCKSDB_NAMESPACE::port::InstallStackTraceHandler(); + ::testing::InitGoogleTest(&argc, argv); + + return RUN_ALL_TESTS(); +} |