mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 15:16:12 -04:00
Alexey Polyudov
b724d792dd
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I9a7d3c3d9790dc58c0d4c2bd2134499337b9a17b
92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "platform/base/prng.h"
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#include "gtest/gtest.h"
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namespace location {
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namespace nearby {
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enum class TestMode {
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kUpperHalfOfInt64,
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kLowerHalfOfInt64,
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kInt32,
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kUint32,
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};
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TEST(PrngTest, NextInt32) {
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std::int32_t i = Prng().NextInt32();
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EXPECT_LE(i, std::numeric_limits<std::int32_t>::max());
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EXPECT_GE(i, std::numeric_limits<std::int32_t>::min());
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}
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TEST(PrngTest, NextUInt32) {
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std::uint32_t i = Prng().NextUint32();
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EXPECT_LE(i, std::numeric_limits<std::uint32_t>::max());
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EXPECT_GE(i, std::numeric_limits<std::uint32_t>::min());
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}
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TEST(PrngTest, NextInt64) {
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std::int64_t i = Prng().NextInt64();
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EXPECT_LE(i, std::numeric_limits<std::int64_t>::max());
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EXPECT_GE(i, std::numeric_limits<std::int64_t>::min());
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}
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void ValidateRandom(TestMode mode) {
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int count_all_zeros = 0;
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int count_all_ones = 0;
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std::uint32_t i;
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Prng prng;
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for (int count = 0; count < 100; ++count) {
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switch (mode) {
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case TestMode::kUpperHalfOfInt64:
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i = static_cast<std::uint32_t>(prng.NextInt64() >> 32);
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break;
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case TestMode::kLowerHalfOfInt64:
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i = static_cast<std::uint32_t>(prng.NextInt64());
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break;
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case TestMode::kInt32:
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i = static_cast<std::uint32_t>(prng.NextInt32());
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break;
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case TestMode::kUint32:
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i = static_cast<std::uint32_t>(prng.NextUint32());
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break;
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}
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if (!i) count_all_zeros++;
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if (i == 0xFFFFFFFF) count_all_ones++;
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}
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EXPECT_LE(count_all_zeros, 1);
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EXPECT_LE(count_all_ones, 1);
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}
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TEST(PrngTest, ValidateUpperHalfOfInt64) {
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ValidateRandom(TestMode::kUpperHalfOfInt64);
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}
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TEST(PrngTest, ValidateLowerHalfOfInt64) {
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ValidateRandom(TestMode::kLowerHalfOfInt64);
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}
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TEST(PrngTest, ValidateInt32) {
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ValidateRandom(TestMode::kInt32);
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}
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TEST(PrngTest, ValidateUint32) {
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ValidateRandom(TestMode::kUint32);
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}
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} // namespace nearby
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} // namespace location
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