chrome/elevation_service/elevator_unittest.cc

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/elevation_service/elevator.h"

#include <algorithm>
#include <string>
#include <vector>

#include "testing/gtest/include/gtest/gtest.h"

namespace elevation_service {

class ElevatorTest : public ::testing::Test {};

TEST_F(ElevatorTest, StringHandlingTest) {
  {
    std::string str;
    const std::string kFirstString("hello again");
    Elevator::AppendStringWithLength(kFirstString, str);
    EXPECT_EQ(sizeof(uint32_t) + kFirstString.length(), str.length());

    const std::string kSecondString("another string");
    Elevator::AppendStringWithLength(kSecondString, str);
    EXPECT_EQ(sizeof(uint32_t) + kFirstString.length() + sizeof(uint32_t) +
                  kSecondString.length(),
              str.length());

    const std::string first_str = Elevator::PopFromStringFront(str);
    EXPECT_EQ(kFirstString, first_str);
    EXPECT_EQ(sizeof(uint32_t) + kSecondString.length(), str.length());

    const std::string second_str = Elevator::PopFromStringFront(str);
    EXPECT_EQ(kSecondString, second_str);

    const std::string error_str = Elevator::PopFromStringFront(str);
    EXPECT_TRUE(error_str.empty());

    std::string str2;

    Elevator::AppendStringWithLength("", str2);
    EXPECT_EQ(sizeof(uint32_t), str2.length());

    std::string empty_str = Elevator::PopFromStringFront(str2);
    EXPECT_TRUE(empty_str.empty());
  }
  {
    // Test data with embedded nulls to make sure it's handled correctly.
    const std::vector<uint8_t> test_data1{6, 5, 4, 3, 2, 1, 0, 1, 2,
                                          3, 4, 5, 6, 0, 1, 2, 3, 4};
    const std::vector<uint8_t> test_data2{0, 1, 4, 0, 1, 4, 5, 0};
    std::string str;
    Elevator::AppendStringWithLength(
        std::string(test_data1.cbegin(), test_data1.cend()), str);
    Elevator::AppendStringWithLength(
        std::string(test_data2.cbegin(), test_data2.cend()), str);
    EXPECT_EQ(sizeof(uint32_t) + test_data1.size() + sizeof(uint32_t) +
                  test_data2.size(),
              str.length());
    const std::string first_str = Elevator::PopFromStringFront(str);
    EXPECT_TRUE(
        std::equal(test_data1.cbegin(), test_data1.cend(), first_str.cbegin()));
    const std::string second_str = Elevator::PopFromStringFront(str);
    EXPECT_TRUE(std::equal(test_data2.cbegin(), test_data2.cend(),
                           second_str.cbegin()));
  }
}

}  // namespace elevation_service