74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
// Copyright 2015 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/misc/random_string.h"
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#include <sys/types.h>
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#include <iterator>
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#include <set>
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#include "gtest/gtest.h"
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namespace crashpad {
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namespace test {
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namespace {
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TEST(RandomString, RandomString) {
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// Explicitly list the allowed characters, rather than relying on a range.
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// This prevents the test from having any dependency on the character set, so
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// that the implementation is free to assume all uppercase letters are
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// contiguous as in ASCII.
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const std::string allowed_characters("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
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size_t character_counts[26] = {};
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ASSERT_EQ(allowed_characters.size(), std::size(character_counts));
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std::set<std::string> strings;
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for (size_t i = 0; i < 256; ++i) {
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const std::string random_string = RandomString();
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EXPECT_EQ(random_string.size(), 16u);
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// Make sure that the string is unique. It is possible, but extremely
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// unlikely, for there to be collisions.
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auto result = strings.insert(random_string);
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EXPECT_TRUE(result.second) << random_string;
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for (char c : random_string) {
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size_t character_index = allowed_characters.find(c);
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// Make sure that no unexpected characters appear.
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EXPECT_NE(character_index, std::string::npos) << c;
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if (character_index != std::string::npos) {
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++character_counts[character_index];
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}
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}
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}
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// Make sure every character appears at least once. It is possible, but
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// extremely unlikely, for a character to not appear at all.
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for (size_t character_index = 0;
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character_index < std::size(character_counts);
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++character_index) {
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EXPECT_GT(character_counts[character_index], 0u)
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<< allowed_characters[character_index];
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}
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}
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} // namespace
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} // namespace test
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} // namespace crashpad
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