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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/rand_util.h"
#include <limits>
#include "testing/gtest/include/gtest/gtest.h"
namespace {
const int kIntMin = std::numeric_limits<int>::min();
const int kIntMax = std::numeric_limits<int>::max();
} // namespace
TEST(RandUtilTest, SameMinAndMax) {
EXPECT_EQ(base::RandInt(0, 0), 0);
EXPECT_EQ(base::RandInt(kIntMin, kIntMin), kIntMin);
EXPECT_EQ(base::RandInt(kIntMax, kIntMax), kIntMax);
}
TEST(RandUtilTest, RandDouble) {
// Force 64-bit precision, making sure we're not in a 80-bit FPU register.
volatile double number = base::RandDouble();
EXPECT_GT(1.0, number);
EXPECT_LE(0.0, number);
}
TEST(RandUtilTest, RandBytes) {
const size_t buffer_size = 145;
char buffer[buffer_size];
memset(buffer, 0, buffer_size);
base::RandBytes(buffer, buffer_size);
char accumulator = 0;
for(size_t i = 0; i < buffer_size; ++i)
accumulator |= buffer[i];
// In theory this test can fail, but it won't before the universe dies of
// heat death.
EXPECT_NE(0, accumulator);
}
TEST(RandUtilTest, RandBytesAsString) {
std::string random_string = base::RandBytesAsString(0);
EXPECT_EQ(0U, random_string.size());
random_string = base::RandBytesAsString(145);
EXPECT_EQ(145U, random_string.size());
char accumulator = 0;
for (size_t i = 0; i < random_string.size(); ++i)
accumulator |= random_string[i];
// In theory this test can fail, but it won't before the universe dies of
// heat death.
EXPECT_NE(0, accumulator);
}
// Make sure that it is still appropriate to use RandGenerator in conjunction
// with std::random_shuffle().
TEST(RandUtilTest, RandGeneratorForRandomShuffle) {
EXPECT_EQ(base::RandGenerator(1), 0U);
EXPECT_LE(std::numeric_limits<ptrdiff_t>::max(),
std::numeric_limits<int64>::max());
}
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