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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
- //
- // 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 "util/misc/random_string.h"
- #include <sys/types.h>
- #include <set>
- #include "base/macros.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(), arraysize(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) {
- ++character_counts[character_index];
- }
- }
- }
- // 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 < arraysize(character_counts);
- ++character_index) {
- EXPECT_GT(character_counts[character_index], 0u)
- << allowed_characters[character_index];
- }
- }
- } // namespace
- } // namespace test
- } // namespace crashpad
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