108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
|
|
* Copyright (C) 2017 The Android Open Source Project
|
|
*
|
|
* 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 <limits>
|
|
#include "gtest/gtest.h"
|
|
|
|
#include "include/random_generator.h"
|
|
|
|
template <typename TestType>
|
|
class RandomGeneratorTest : public testing::Test {
|
|
public:
|
|
wifi_offload_test::RandomGenerator random_gen_;
|
|
|
|
void GeneratedNumbersAreSmallerOrEqualTypeMaxValue() {
|
|
uint64_t rand_val = random_gen_.get<TestType>();
|
|
uint64_t max_val = std::numeric_limits<TestType>::max();
|
|
|
|
EXPECT_TRUE(rand_val <= max_val);
|
|
}
|
|
|
|
void AllRandomGeneratorsGenerateTheSameSequence() {
|
|
constexpr size_t num_values = 10;
|
|
TestType rand_values[num_values];
|
|
|
|
for (size_t i = 0; i < num_values; i++) {
|
|
rand_values[i] = random_gen_.get<TestType>();
|
|
}
|
|
|
|
wifi_offload_test::RandomGenerator another_random_gen_;
|
|
for (size_t i = 0; i < num_values; i++) {
|
|
ASSERT_EQ(rand_values[i], another_random_gen_.get<TestType>());
|
|
}
|
|
}
|
|
|
|
void AfterResetGeneratesTheSameSequence() {
|
|
constexpr size_t num_values = 10;
|
|
TestType rand_values[num_values];
|
|
|
|
for (size_t i = 0; i < num_values; i++) {
|
|
rand_values[i] = random_gen_.get<TestType>();
|
|
}
|
|
|
|
random_gen_.Reset();
|
|
for (size_t i = 0; i < num_values; i++) {
|
|
ASSERT_EQ(rand_values[i], random_gen_.get<TestType>());
|
|
}
|
|
}
|
|
|
|
void GeneratesDifferentNumbersIn8Bytes() {
|
|
constexpr size_t num_values = 10;
|
|
uint64_t rand_values[num_values];
|
|
|
|
constexpr size_t repeats_to_fill_8_bytes =
|
|
sizeof(uint64_t) / sizeof(TestType);
|
|
constexpr size_t shift_size =
|
|
(sizeof(TestType) * 8) % (sizeof(uint64_t) * 8);
|
|
|
|
for (size_t i = 0; i < num_values; i++) {
|
|
rand_values[i] = 0;
|
|
for (size_t j = 0; j < repeats_to_fill_8_bytes; j++) {
|
|
rand_values[i] <<= shift_size;
|
|
rand_values[i] |= random_gen_.get<TestType>();
|
|
}
|
|
}
|
|
|
|
// The probability of choosing equal random numbers out of 2 ^ 64 values
|
|
// is "extremely" small. Smaller than the change of memory failure.
|
|
for (size_t i = 0; i < num_values - 1; i++) {
|
|
for (size_t j = i + 1; j < num_values; j++) {
|
|
ASSERT_NE(rand_values[i], rand_values[j]);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
typedef testing::Types<uint8_t, uint16_t, uint32_t, uint64_t> Implementations;
|
|
|
|
TYPED_TEST_CASE(RandomGeneratorTest, Implementations);
|
|
|
|
TYPED_TEST(RandomGeneratorTest, GeneratedNumbersAreSmallerOrEqualTypeMaxValue) {
|
|
this->GeneratedNumbersAreSmallerOrEqualTypeMaxValue();
|
|
}
|
|
|
|
TYPED_TEST(RandomGeneratorTest, AllRandomGeneratorsGenerateTheSameSequence) {
|
|
this->AllRandomGeneratorsGenerateTheSameSequence();
|
|
}
|
|
|
|
TYPED_TEST(RandomGeneratorTest, AfterResetGeneratesTheSameSequence) {
|
|
this->AfterResetGeneratesTheSameSequence();
|
|
}
|
|
|
|
TYPED_TEST(RandomGeneratorTest, GeneratesDifferentNumbersIn8Bytes) {
|
|
this->GeneratesDifferentNumbersIn8Bytes();
|
|
}
|