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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/tint/fuzzers/random_generator.h"
#include <memory>
#include "gtest/gtest.h"
#include "src/tint/fuzzers/mersenne_twister_engine.h"
namespace tint {
namespace fuzzers {
namespace {
/// Implementation of RandomGeneratorEngine that just returns a stream of
/// monotonically increasing numbers.
class MonotonicEngine : public RandomGeneratorEngine {
public:
uint32_t RandomUInt32(uint32_t, uint32_t) override { return next_++; }
uint64_t RandomUInt64(uint64_t, uint64_t) override { return next_++; }
void RandomNBytes(uint8_t*, size_t) override {
assert(false && "MonotonicDelegate does not implement RandomNBytes");
}
private:
uint32_t next_ = 0;
};
class RandomGeneratorTest : public testing::Test {
public:
void SetUp() override { rng_ = std::make_unique<RandomGenerator>(0); }
void TearDown() override {}
protected:
std::unique_ptr<RandomGenerator> rng_;
};
#ifndef NDEBUG
TEST_F(RandomGeneratorTest, GetUInt32ReversedBoundsCrashes) {
EXPECT_DEATH(rng_->GetUInt32(10, 5), ".*");
}
TEST_F(RandomGeneratorTest, GetUInt32EmptyBoundsCrashes) {
EXPECT_DEATH(rng_->GetUInt32(5, 5), ".*");
}
TEST_F(RandomGeneratorTest, GetUInt32ZeroBoundCrashes) {
EXPECT_DEATH(rng_->GetUInt32(0u), ".*");
}
#endif // NDEBUG
TEST_F(RandomGeneratorTest, GetUInt32SingularReturnsOneValue) {
{
uint32_t result = rng_->GetUInt32(5u, 6u);
ASSERT_EQ(5u, result);
}
{
uint32_t result = rng_->GetUInt32(1u);
ASSERT_EQ(0u, result);
}
}
TEST_F(RandomGeneratorTest, GetUInt32StaysInBounds) {
{
uint32_t result = rng_->GetUInt32(5u, 10u);
ASSERT_LE(5u, result);
ASSERT_GT(10u, result);
}
{
uint32_t result = rng_->GetUInt32(10u);
ASSERT_LE(0u, result);
ASSERT_GT(10u, result);
}
}
#ifndef NDEBUG
TEST_F(RandomGeneratorTest, GetUInt64ReversedBoundsCrashes) {
EXPECT_DEATH(rng_->GetUInt64(10, 5), ".*");
}
TEST_F(RandomGeneratorTest, GetUInt64EmptyBoundsCrashes) {
EXPECT_DEATH(rng_->GetUInt64(5, 5), ".*");
}
TEST_F(RandomGeneratorTest, GetUInt64ZeroBoundCrashes) {
EXPECT_DEATH(rng_->GetUInt64(0u), ".*");
}
#endif // NDEBUG
TEST_F(RandomGeneratorTest, GetUInt64SingularReturnsOneValue) {
{
uint64_t result = rng_->GetUInt64(5u, 6u);
ASSERT_EQ(5u, result);
}
{
uint64_t result = rng_->GetUInt64(1u);
ASSERT_EQ(0u, result);
}
}
TEST_F(RandomGeneratorTest, GetUInt64StaysInBounds) {
{
uint64_t result = rng_->GetUInt64(5u, 10u);
ASSERT_LE(5u, result);
ASSERT_GT(10u, result);
}
{
uint64_t result = rng_->GetUInt64(10u);
ASSERT_LE(0u, result);
ASSERT_GT(10u, result);
}
}
TEST_F(RandomGeneratorTest, GetByte) {
rng_->GetByte();
}
#ifndef NDEBUG
TEST_F(RandomGeneratorTest, GetNBytesNullDataBufferCrashes) {
EXPECT_DEATH(rng_->GetNBytes(nullptr, 5), ".*");
}
#endif // NDEBUG
TEST_F(RandomGeneratorTest, GetNBytes) {
std::vector<uint8_t> data;
for (uint32_t i = 25; i < 1000u; i = i + 25) {
data.resize(i);
rng_->GetNBytes(data.data(), data.size());
}
}
TEST_F(RandomGeneratorTest, GetBool) {
rng_->GetBool();
}
TEST_F(RandomGeneratorTest, GetWeightedBoolZeroAlwaysFalse) {
ASSERT_FALSE(rng_->GetWeightedBool(0));
}
TEST_F(RandomGeneratorTest, GetWeightedBoolHundredAlwaysTrue) {
ASSERT_TRUE(rng_->GetWeightedBool(100));
}
#ifndef NDEBUG
TEST_F(RandomGeneratorTest, GetWeightedBoolAboveHundredCrashes) {
EXPECT_DEATH(rng_->GetWeightedBool(101), ".*");
EXPECT_DEATH(rng_->GetWeightedBool(500), ".*");
}
#endif // NDEBUG
TEST_F(RandomGeneratorTest, GetWeightedBool) {
for (uint32_t i = 0; i <= 100; i++) {
rng_ =
std::make_unique<RandomGenerator>(std::make_unique<MonotonicEngine>());
for (uint32_t j = 0; j <= 100; j++) {
if (j < i) {
ASSERT_TRUE(rng_->GetWeightedBool(i));
} else {
ASSERT_FALSE(rng_->GetWeightedBool(i));
}
}
}
}
#ifndef NDEBUG
TEST_F(RandomGeneratorTest, GetRandomElementEmptyVectorCrashes) {
std::vector<uint8_t> v;
EXPECT_DEATH(rng_->GetRandomElement(v), ".*");
}
#endif // NDEBUG
TEST_F(RandomGeneratorTest, GetRandomElement) {
std::vector<uint32_t> v;
for (uint32_t i = 25; i < 100u; i = i + 25) {
rng_ =
std::make_unique<RandomGenerator>(std::make_unique<MonotonicEngine>());
v.resize(i);
std::iota(v.begin(), v.end(), 0);
for (uint32_t j = 0; j < i; j++) {
EXPECT_EQ(j, rng_->GetRandomElement(v));
}
}
}
} // namespace
} // namespace fuzzers
} // namespace tint