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// Copyright 2015 The Crashpad Authors. All rights reserved.
// 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "util/misc/random_string.h"
#include <sys/types.h>
#include <set>
#include "base/cxx17_backports.h"
#include "gtest/gtest.h"
namespace crashpad {
namespace test {
namespace {
TEST(RandomString, RandomString) {
// Explicitly list the allowed characters, rather than relying on a range.
// This prevents the test from having any dependency on the character set, so
// that the implementation is free to assume all uppercase letters are
// contiguous as in ASCII.
const std::string allowed_characters("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
size_t character_counts[26] = {};
ASSERT_EQ(allowed_characters.size(), base::size(character_counts));
std::set<std::string> strings;
for (size_t i = 0; i < 256; ++i) {
const std::string random_string = RandomString();
EXPECT_EQ(random_string.size(), 16u);
// Make sure that the string is unique. It is possible, but extremely
// unlikely, for there to be collisions.
auto result = strings.insert(random_string);
EXPECT_TRUE(result.second) << random_string;
for (char c : random_string) {
size_t character_index = allowed_characters.find(c);
// Make sure that no unexpected characters appear.
EXPECT_NE(character_index, std::string::npos) << c;
if (character_index != std::string::npos) {
// Make sure every character appears at least once. It is possible, but
// extremely unlikely, for a character to not appear at all.
for (size_t character_index = 0;
character_index < base::size(character_counts);
++character_index) {
EXPECT_GT(character_counts[character_index], 0u)
<< allowed_characters[character_index];
} // namespace
} // namespace test
} // namespace crashpad