mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 15:16:12 -04:00
Alexey Polyudov
2155b3ddeb
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I9850950db8bd84f0904ea1a413151887f52098cf
78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
#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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