// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/command_line.h"

#include <memory>
#include <string>
#include <vector>

#include "base/debug/debugging_buildflags.h"
#include "base/files/file_path.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

#if BUILDFLAG(IS_WIN)
#include <windows.h>

#include <shellapi.h>

#include "base/win/scoped_localalloc.h"
#endif  // BUILDFLAG(IS_WIN)

#if BUILDFLAG(ENABLE_COMMANDLINE_SEQUENCE_CHECKS)
#include "base/run_loop.h"
#include "base/task/thread_pool.h"
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#endif  // BUILDFLAG(ENABLE_COMMANDLINE_SEQUENCE_CHECKS)

namespace base {

#if BUILDFLAG(IS_WIN)
// To test Windows quoting behavior, we use a string that has some backslashes
// and quotes.
// Consider the command-line argument: q\"bs1\bs2\\bs3q\\\"
// Here it is with C-style escapes.
static const CommandLine::StringType kTrickyQuoted =
    FILE_PATH_LITERAL("q\\\"bs1\\bs2\\\\bs3q\\\\\\\"");
#endif

// It should be parsed by Windows as: q"bs1\bs2\\bs3q\"
// Here that is with C-style escapes.
static const CommandLine::StringType kTricky =
    FILE_PATH_LITERAL("q\"bs1\\bs2\\\\bs3q\\\"");

TEST(CommandLineTest, CommandLineConstructor) {
  const CommandLine::CharType* argv[] = {
      FILE_PATH_LITERAL("program"),
      FILE_PATH_LITERAL("--foo="),
      FILE_PATH_LITERAL("-bAr"),
      FILE_PATH_LITERAL("-spaetzel=pierogi"),
      FILE_PATH_LITERAL("-baz"),
      FILE_PATH_LITERAL("flim"),
      FILE_PATH_LITERAL("--other-switches=--dog=canine --cat=feline"),
      FILE_PATH_LITERAL("-spaetzle=Crepe"),
      FILE_PATH_LITERAL("-=loosevalue"),
      FILE_PATH_LITERAL("-"),
      FILE_PATH_LITERAL("FLAN"),
      FILE_PATH_LITERAL("a"),
      FILE_PATH_LITERAL("--input-translation=45--output-rotation"),
      FILE_PATH_LITERAL("--"),
      FILE_PATH_LITERAL("--"),
      FILE_PATH_LITERAL("--not-a-switch"),
      FILE_PATH_LITERAL("\"in the time of submarines...\""),
      FILE_PATH_LITERAL("unquoted arg-with-space")};
  CommandLine cl(std::size(argv), argv);

  EXPECT_FALSE(cl.GetCommandLineString().empty());
  EXPECT_FALSE(cl.HasSwitch("cruller"));
  EXPECT_FALSE(cl.HasSwitch("flim"));
  EXPECT_FALSE(cl.HasSwitch("program"));
  EXPECT_FALSE(cl.HasSwitch("dog"));
  EXPECT_FALSE(cl.HasSwitch("cat"));
  EXPECT_FALSE(cl.HasSwitch("output-rotation"));
  EXPECT_FALSE(cl.HasSwitch("not-a-switch"));
  EXPECT_FALSE(cl.HasSwitch("--"));

  EXPECT_EQ(FilePath(FILE_PATH_LITERAL("program")).value(),
            cl.GetProgram().value());

  EXPECT_TRUE(cl.HasSwitch("foo"));
#if BUILDFLAG(IS_WIN)
  EXPECT_TRUE(cl.HasSwitch("bar"));
#else
  EXPECT_FALSE(cl.HasSwitch("bar"));
#endif
  EXPECT_TRUE(cl.HasSwitch("baz"));
  EXPECT_TRUE(cl.HasSwitch("spaetzle"));
  EXPECT_TRUE(cl.HasSwitch("other-switches"));
  EXPECT_TRUE(cl.HasSwitch("input-translation"));

  EXPECT_EQ("Crepe", cl.GetSwitchValueASCII("spaetzle"));
  EXPECT_EQ("", cl.GetSwitchValueASCII("foo"));
  EXPECT_EQ("", cl.GetSwitchValueASCII("bar"));
  EXPECT_EQ("", cl.GetSwitchValueASCII("cruller"));
  EXPECT_EQ("--dog=canine --cat=feline", cl.GetSwitchValueASCII(
      "other-switches"));
  EXPECT_EQ("45--output-rotation", cl.GetSwitchValueASCII("input-translation"));

  const CommandLine::StringVector& args = cl.GetArgs();
  ASSERT_EQ(8U, args.size());

  auto iter = args.begin();
  EXPECT_EQ(FILE_PATH_LITERAL("flim"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("-"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("FLAN"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("a"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("--"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("--not-a-switch"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("\"in the time of submarines...\""), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("unquoted arg-with-space"), *iter);
  ++iter;
  EXPECT_TRUE(iter == args.end());
}

TEST(CommandLineTest, CommandLineFromString) {
#if BUILDFLAG(IS_WIN)
  CommandLine cl = CommandLine::FromString(
      L"program --foo= -bAr  /Spaetzel=pierogi /Baz flim "
      L"--other-switches=\"--dog=canine --cat=feline\" "
      L"-spaetzle=Crepe   -=loosevalue  FLAN "
      L"--input-translation=\"45\"--output-rotation "
      L"--quotes=" +
      kTrickyQuoted +
      L" -- -- --not-a-switch \"in the time of submarines...\"");

  EXPECT_FALSE(cl.GetCommandLineString().empty());
  EXPECT_FALSE(cl.HasSwitch("cruller"));
  EXPECT_FALSE(cl.HasSwitch("flim"));
  EXPECT_FALSE(cl.HasSwitch("program"));
  EXPECT_FALSE(cl.HasSwitch("dog"));
  EXPECT_FALSE(cl.HasSwitch("cat"));
  EXPECT_FALSE(cl.HasSwitch("output-rotation"));
  EXPECT_FALSE(cl.HasSwitch("not-a-switch"));
  EXPECT_FALSE(cl.HasSwitch("--"));

  EXPECT_EQ(FilePath(FILE_PATH_LITERAL("program")).value(),
            cl.GetProgram().value());

  EXPECT_TRUE(cl.HasSwitch("foo"));
  EXPECT_TRUE(cl.HasSwitch("bar"));
  EXPECT_TRUE(cl.HasSwitch("baz"));
  EXPECT_TRUE(cl.HasSwitch("spaetzle"));
  EXPECT_TRUE(cl.HasSwitch("other-switches"));
  EXPECT_TRUE(cl.HasSwitch("input-translation"));
  EXPECT_TRUE(cl.HasSwitch("quotes"));

  EXPECT_EQ("Crepe", cl.GetSwitchValueASCII("spaetzle"));
  EXPECT_EQ("", cl.GetSwitchValueASCII("foo"));
  EXPECT_EQ("", cl.GetSwitchValueASCII("bar"));
  EXPECT_EQ("", cl.GetSwitchValueASCII("cruller"));
  EXPECT_EQ("--dog=canine --cat=feline", cl.GetSwitchValueASCII(
      "other-switches"));
  EXPECT_EQ("45--output-rotation", cl.GetSwitchValueASCII("input-translation"));
  EXPECT_EQ(kTricky, cl.GetSwitchValueNative("quotes"));

  const CommandLine::StringVector& args = cl.GetArgs();
  ASSERT_EQ(5U, args.size());

  std::vector<CommandLine::StringType>::const_iterator iter = args.begin();
  EXPECT_EQ(FILE_PATH_LITERAL("flim"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("FLAN"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("--"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("--not-a-switch"), *iter);
  ++iter;
  EXPECT_EQ(FILE_PATH_LITERAL("in the time of submarines..."), *iter);
  ++iter;
  EXPECT_TRUE(iter == args.end());

  // Check that a generated string produces an equivalent command line.
  CommandLine cl_duplicate = CommandLine::FromString(cl.GetCommandLineString());
  EXPECT_EQ(cl.GetCommandLineString(), cl_duplicate.GetCommandLineString());
#endif
}

// Tests behavior with an empty input string.
TEST(CommandLineTest, EmptyString) {
#if BUILDFLAG(IS_WIN)
  CommandLine cl_from_string = CommandLine::FromString(std::wstring());
  EXPECT_TRUE(cl_from_string.GetCommandLineString().empty());
  EXPECT_TRUE(cl_from_string.GetProgram().empty());
  EXPECT_EQ(1U, cl_from_string.argv().size());
  EXPECT_TRUE(cl_from_string.GetArgs().empty());
#endif
  CommandLine cl_from_argv(0, nullptr);
  EXPECT_TRUE(cl_from_argv.GetCommandLineString().empty());
  EXPECT_TRUE(cl_from_argv.GetProgram().empty());
  EXPECT_EQ(1U, cl_from_argv.argv().size());
  EXPECT_TRUE(cl_from_argv.GetArgs().empty());
}

TEST(CommandLineTest, GetArgumentsString) {
  static const FilePath::CharType kPath1[] =
      FILE_PATH_LITERAL("C:\\Some File\\With Spaces.ggg");
  static const FilePath::CharType kPath2[] =
      FILE_PATH_LITERAL("C:\\no\\spaces.ggg");

  static const char kFirstArgName[] = "first-arg";
  static const char kSecondArgName[] = "arg2";
  static const char kThirdArgName[] = "arg with space";
  static const char kFourthArgName[] = "nospace";

  CommandLine cl(CommandLine::NO_PROGRAM);
  cl.AppendSwitchPath(kFirstArgName, FilePath(kPath1));
  cl.AppendSwitchPath(kSecondArgName, FilePath(kPath2));
  cl.AppendArg(kThirdArgName);
  cl.AppendArg(kFourthArgName);

#if BUILDFLAG(IS_WIN)
  CommandLine::StringType expected_first_arg(UTF8ToWide(kFirstArgName));
  CommandLine::StringType expected_second_arg(UTF8ToWide(kSecondArgName));
  CommandLine::StringType expected_third_arg(UTF8ToWide(kThirdArgName));
  CommandLine::StringType expected_fourth_arg(UTF8ToWide(kFourthArgName));
#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
  CommandLine::StringType expected_first_arg(kFirstArgName);
  CommandLine::StringType expected_second_arg(kSecondArgName);
  CommandLine::StringType expected_third_arg(kThirdArgName);
  CommandLine::StringType expected_fourth_arg(kFourthArgName);
#endif

#if BUILDFLAG(IS_WIN)
#define QUOTE_ON_WIN FILE_PATH_LITERAL("\"")
#else
#define QUOTE_ON_WIN FILE_PATH_LITERAL("")
#endif  // BUILDFLAG(IS_WIN)

  CommandLine::StringType expected_str;
  expected_str.append(FILE_PATH_LITERAL("--"))
      .append(expected_first_arg)
      .append(FILE_PATH_LITERAL("="))
      .append(QUOTE_ON_WIN)
      .append(kPath1)
      .append(QUOTE_ON_WIN)
      .append(FILE_PATH_LITERAL(" "))
      .append(FILE_PATH_LITERAL("--"))
      .append(expected_second_arg)
      .append(FILE_PATH_LITERAL("="))
      .append(QUOTE_ON_WIN)
      .append(kPath2)
      .append(QUOTE_ON_WIN)
      .append(FILE_PATH_LITERAL(" "))
      .append(QUOTE_ON_WIN)
      .append(expected_third_arg)
      .append(QUOTE_ON_WIN)
      .append(FILE_PATH_LITERAL(" "))
      .append(expected_fourth_arg);
  EXPECT_EQ(expected_str, cl.GetArgumentsString());
}

// Test methods for appending switches to a command line.
TEST(CommandLineTest, AppendSwitches) {
  std::string switch1 = "switch1";
  std::string switch2 = "switch2";
  std::string value2 = "value";
  std::string switch3 = "switch3";
  std::string value3 = "a value with spaces";
  std::string switch4 = "switch4";
  std::string value4 = "\"a value with quotes\"";
  std::string switch5 = "quotes";
  CommandLine::StringType value5 = kTricky;

  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch(switch1);
  cl.AppendSwitchASCII(switch2, value2);
  cl.AppendSwitchASCII(switch3, value3);
  cl.AppendSwitchASCII(switch4, value4);
  cl.AppendSwitchASCII(switch5, value4);
  cl.AppendSwitchNative(switch5, value5);

  EXPECT_TRUE(cl.HasSwitch(switch1));
  EXPECT_TRUE(cl.HasSwitch(switch2));
  EXPECT_EQ(value2, cl.GetSwitchValueASCII(switch2));
  EXPECT_TRUE(cl.HasSwitch(switch3));
  EXPECT_EQ(value3, cl.GetSwitchValueASCII(switch3));
  EXPECT_TRUE(cl.HasSwitch(switch4));
  EXPECT_EQ(value4, cl.GetSwitchValueASCII(switch4));
  EXPECT_TRUE(cl.HasSwitch(switch5));
  EXPECT_EQ(value5, cl.GetSwitchValueNative(switch5));

#if BUILDFLAG(IS_WIN)
  EXPECT_EQ(
      L"Program "
      L"--switch1 "
      L"--switch2=value "
      L"--switch3=\"a value with spaces\" "
      L"--switch4=\"\\\"a value with quotes\\\"\" "
      // Even though the switches are unique, appending can add repeat
      // switches to argv.
      L"--quotes=\"\\\"a value with quotes\\\"\" "
      L"--quotes=\"" +
          kTrickyQuoted + L"\"",
      cl.GetCommandLineString());
#endif
}

TEST(CommandLineTest, AppendSwitchesDashDash) {
  const CommandLine::CharType* const raw_argv[] = {FILE_PATH_LITERAL("prog"),
                                                   FILE_PATH_LITERAL("--"),
                                                   FILE_PATH_LITERAL("--arg1")};
  CommandLine cl(std::size(raw_argv), raw_argv);

  cl.AppendSwitch("switch1");
  cl.AppendSwitchASCII("switch2", "foo");

  cl.AppendArg("--arg2");

  EXPECT_EQ(FILE_PATH_LITERAL("prog --switch1 --switch2=foo -- --arg1 --arg2"),
            cl.GetCommandLineString());
  CommandLine::StringVector cl_argv = cl.argv();
  EXPECT_EQ(FILE_PATH_LITERAL("prog"), cl_argv[0]);
  EXPECT_EQ(FILE_PATH_LITERAL("--switch1"), cl_argv[1]);
  EXPECT_EQ(FILE_PATH_LITERAL("--switch2=foo"), cl_argv[2]);
  EXPECT_EQ(FILE_PATH_LITERAL("--"), cl_argv[3]);
  EXPECT_EQ(FILE_PATH_LITERAL("--arg1"), cl_argv[4]);
  EXPECT_EQ(FILE_PATH_LITERAL("--arg2"), cl_argv[5]);
}

#if BUILDFLAG(IS_WIN)
struct CommandLineQuoteTestCase {
  const wchar_t* const input_arg;
  const wchar_t* const expected_output_arg;
};

class CommandLineQuoteTest
    : public ::testing::TestWithParam<CommandLineQuoteTestCase> {};

INSTANTIATE_TEST_SUITE_P(
    CommandLineQuoteTestCases,
    CommandLineQuoteTest,
    ::testing::ValuesIn(std::vector<CommandLineQuoteTestCase>{
        {L"", L""},
        {L"abc = xyz", LR"("abc = xyz")"},
        {LR"(C:\AppData\Local\setup.exe)", LR"("C:\AppData\Local\setup.exe")"},
        {LR"(C:\Program Files\setup.exe)", LR"("C:\Program Files\setup.exe")"},
        {LR"("C:\Program Files\setup.exe")",
         LR"("\"C:\Program Files\setup.exe\"")"},
    }));

TEST_P(CommandLineQuoteTest, TestCases) {
  EXPECT_EQ(CommandLine::QuoteForCommandLineToArgvW(GetParam().input_arg),
            GetParam().expected_output_arg);
}

struct CommandLineQuoteAfterTestCase {
  const std::vector<std::wstring> input_args;
  const wchar_t* const expected_output;
};

class CommandLineQuoteAfterTest
    : public ::testing::TestWithParam<CommandLineQuoteAfterTestCase> {};

INSTANTIATE_TEST_SUITE_P(
    CommandLineQuoteAfterTestCases,
    CommandLineQuoteAfterTest,
    ::testing::ValuesIn(std::vector<CommandLineQuoteAfterTestCase>{
        {{L"abc=1"}, L"abc=1"},
        {{L"abc=1", L"xyz=2"}, L"abc=1 xyz=2"},
        {{L"abc=1", L"xyz=2", L"q"}, L"abc=1 xyz=2 q"},
        {{L" abc=1  ", L"  xyz=2", L"q "}, L"abc=1 xyz=2 q"},
        {{LR"("abc = 1")"}, LR"("abc = 1")"},
        {{LR"(abc" = "1)", L"xyz=2"}, LR"("abc = 1" xyz=2)"},
        {{LR"(abc" = "1)"}, LR"("abc = 1")"},
        {{LR"(\\)", LR"(\\\")"}, LR"("\\\\" "\\\"")"},
    }));

TEST_P(CommandLineQuoteAfterTest, TestCases) {
  std::wstring input_command_line =
      base::StrCat({LR"(c:\test\process.exe )",
                    base::JoinString(GetParam().input_args, L" ")});
  int num_args = 0;
  base::win::ScopedLocalAllocTyped<wchar_t*> argv(
      ::CommandLineToArgvW(&input_command_line[0], &num_args));
  ASSERT_EQ(num_args - 1U, GetParam().input_args.size());

  std::wstring recreated_command_line;
  for (int i = 1; i < num_args; ++i) {
    recreated_command_line.append(
        CommandLine::QuoteForCommandLineToArgvW(argv.get()[i]));

    if (i + 1 < num_args) {
      recreated_command_line.push_back(L' ');
    }
  }

  EXPECT_EQ(recreated_command_line, GetParam().expected_output);
}

TEST(CommandLineTest, GetCommandLineStringForShell) {
  CommandLine cl = CommandLine::FromString(
      FILE_PATH_LITERAL("program --switch /switch2 --"));
  EXPECT_EQ(
      cl.GetCommandLineStringForShell(),
      FILE_PATH_LITERAL("program --switch /switch2 -- --single-argument %1"));
}

TEST(CommandLineTest, GetCommandLineStringWithUnsafeInsertSequences) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("program")));
  cl.AppendSwitchASCII("switch", "%1");
  cl.AppendSwitch("%2");
  cl.AppendArg("%3");
  EXPECT_EQ(FILE_PATH_LITERAL("program --switch=%1 --%2 %3"),
            cl.GetCommandLineStringWithUnsafeInsertSequences());
}

TEST(CommandLineTest, HasSingleArgument) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));
  cl.AppendSwitchASCII("switch2", "foo");
  EXPECT_FALSE(cl.HasSingleArgumentSwitch());
  CommandLine cl_for_shell(
      CommandLine::FromString(cl.GetCommandLineStringForShell()));
  EXPECT_TRUE(cl_for_shell.HasSingleArgumentSwitch());
}

// Test that creating a new command line from the string version of a single
// argument command line maintains the single argument switch, and the
// argument.
TEST(CommandLineTest, MaintainSingleArgument) {
  // Putting a space in the file name will force escaping of the argument.
  static const CommandLine::StringType kCommandLine =
      FILE_PATH_LITERAL("program --switch --single-argument foo bar.html");
  CommandLine cl = CommandLine::FromString(kCommandLine);
  CommandLine cl_for_shell = CommandLine::FromString(cl.GetCommandLineString());
  EXPECT_TRUE(cl_for_shell.HasSingleArgumentSwitch());
  // Verify that we command line survives the round trip with an escaped arg.
  EXPECT_EQ(kCommandLine, cl_for_shell.GetCommandLineString());
}

#endif  // BUILDFLAG(IS_WIN)

// Tests that when AppendArguments is called that the program is set correctly
// on the target CommandLine object and the switches from the source
// CommandLine are added to the target.
TEST(CommandLineTest, AppendArguments) {
  CommandLine cl1(FilePath(FILE_PATH_LITERAL("Program")));
  cl1.AppendSwitch("switch1");
  cl1.AppendSwitchASCII("switch2", "foo");

  CommandLine cl2(CommandLine::NO_PROGRAM);
  cl2.AppendArguments(cl1, true);
  EXPECT_EQ(cl1.GetProgram().value(), cl2.GetProgram().value());
  EXPECT_EQ(cl1.GetCommandLineString(), cl2.GetCommandLineString());

  CommandLine c1(FilePath(FILE_PATH_LITERAL("Program1")));
  c1.AppendSwitch("switch1");
  CommandLine c2(FilePath(FILE_PATH_LITERAL("Program2")));
  c2.AppendSwitch("switch2");

  c1.AppendArguments(c2, true);
  EXPECT_EQ(c1.GetProgram().value(), c2.GetProgram().value());
  EXPECT_TRUE(c1.HasSwitch("switch1"));
  EXPECT_TRUE(c1.HasSwitch("switch2"));
}

#if BUILDFLAG(IS_WIN)
// Make sure that the command line string program paths are quoted as necessary.
// This only makes sense on Windows and the test is basically here to guard
// against regressions.
TEST(CommandLineTest, ProgramQuotes) {
  // Check that quotes are not added for paths without spaces.
  const FilePath kProgram(L"Program");
  CommandLine cl_program(kProgram);
  EXPECT_EQ(kProgram.value(), cl_program.GetProgram().value());
  EXPECT_EQ(kProgram.value(), cl_program.GetCommandLineString());

  const FilePath kProgramPath(L"Program Path");

  // Check that quotes are not returned from GetProgram().
  CommandLine cl_program_path(kProgramPath);
  EXPECT_EQ(kProgramPath.value(), cl_program_path.GetProgram().value());

  // Check that quotes are added to command line string paths containing spaces.
  CommandLine::StringType cmd_string(cl_program_path.GetCommandLineString());
  EXPECT_EQ(L"\"Program Path\"", cmd_string);
}
#endif

// Calling Init multiple times should not modify the previous CommandLine.
TEST(CommandLineTest, Init) {
  // Call Init without checking output once so we know it's been called
  // whether or not the test runner does so.
  CommandLine::Init(0, nullptr);
  CommandLine* initial = CommandLine::ForCurrentProcess();
  EXPECT_FALSE(CommandLine::Init(0, nullptr));
  CommandLine* current = CommandLine::ForCurrentProcess();
  EXPECT_EQ(initial, current);
}

// Test that copies of CommandLine have a valid StringPiece map.
TEST(CommandLineTest, Copy) {
  auto initial = std::make_unique<CommandLine>(CommandLine::NO_PROGRAM);
  initial->AppendSwitch("a");
  initial->AppendSwitch("bbbbbbbbbbbbbbb");
  initial->AppendSwitch("c");
  CommandLine copy_constructed(*initial);
  CommandLine assigned = *initial;
  CommandLine::SwitchMap switch_map = initial->GetSwitches();
  initial.reset();
  for (const auto& pair : switch_map)
    EXPECT_TRUE(copy_constructed.HasSwitch(pair.first));
  for (const auto& pair : switch_map)
    EXPECT_TRUE(assigned.HasSwitch(pair.first));
}

TEST(CommandLineTest, CopySwitches) {
  CommandLine source(CommandLine::NO_PROGRAM);
  source.AppendSwitch("a");
  source.AppendSwitch("bbbb");
  source.AppendSwitch("c");
  EXPECT_THAT(source.argv(), testing::ElementsAre(FILE_PATH_LITERAL(""),
                                                  FILE_PATH_LITERAL("--a"),
                                                  FILE_PATH_LITERAL("--bbbb"),
                                                  FILE_PATH_LITERAL("--c")));

  CommandLine cl(CommandLine::NO_PROGRAM);
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("")));

  cl.CopySwitchesFrom(source, {});
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("")));

  static const char* const kSwitchesToCopy[] = {"a", "nosuch", "c"};
  cl.CopySwitchesFrom(source, kSwitchesToCopy);
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL(""),
                                              FILE_PATH_LITERAL("--a"),
                                              FILE_PATH_LITERAL("--c")));
}

TEST(CommandLineTest, PrependSimpleWrapper) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));
  cl.AppendSwitch("a");
  cl.AppendSwitch("b");
  cl.PrependWrapper(FILE_PATH_LITERAL("wrapper --foo --bar"));

  EXPECT_EQ(6u, cl.argv().size());
  EXPECT_EQ(FILE_PATH_LITERAL("wrapper"), cl.argv()[0]);
  EXPECT_EQ(FILE_PATH_LITERAL("--foo"), cl.argv()[1]);
  EXPECT_EQ(FILE_PATH_LITERAL("--bar"), cl.argv()[2]);
  EXPECT_EQ(FILE_PATH_LITERAL("Program"), cl.argv()[3]);
  EXPECT_EQ(FILE_PATH_LITERAL("--a"), cl.argv()[4]);
  EXPECT_EQ(FILE_PATH_LITERAL("--b"), cl.argv()[5]);
}

TEST(CommandLineTest, PrependComplexWrapper) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));
  cl.AppendSwitch("a");
  cl.AppendSwitch("b");
  cl.PrependWrapper(
      FILE_PATH_LITERAL("wrapper --foo='hello world' --bar=\"let's go\""));

  EXPECT_EQ(6u, cl.argv().size());
  EXPECT_EQ(FILE_PATH_LITERAL("wrapper"), cl.argv()[0]);
  EXPECT_EQ(FILE_PATH_LITERAL("--foo='hello world'"), cl.argv()[1]);
  EXPECT_EQ(FILE_PATH_LITERAL("--bar=\"let's go\""), cl.argv()[2]);
  EXPECT_EQ(FILE_PATH_LITERAL("Program"), cl.argv()[3]);
  EXPECT_EQ(FILE_PATH_LITERAL("--a"), cl.argv()[4]);
  EXPECT_EQ(FILE_PATH_LITERAL("--b"), cl.argv()[5]);
}

TEST(CommandLineTest, RemoveSwitch) {
  const std::string switch1 = "switch1";
  const std::string switch2 = "switch2";
  const std::string value2 = "value";

  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch(switch1);
  cl.AppendSwitchASCII(switch2, value2);

  EXPECT_TRUE(cl.HasSwitch(switch1));
  EXPECT_TRUE(cl.HasSwitch(switch2));
  EXPECT_EQ(value2, cl.GetSwitchValueASCII(switch2));
  EXPECT_THAT(cl.argv(),
              testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                   FILE_PATH_LITERAL("--switch1"),
                                   FILE_PATH_LITERAL("--switch2=value")));

  cl.RemoveSwitch(switch1);

  EXPECT_FALSE(cl.HasSwitch(switch1));
  EXPECT_TRUE(cl.HasSwitch(switch2));
  EXPECT_EQ(value2, cl.GetSwitchValueASCII(switch2));
  EXPECT_THAT(cl.argv(),
              testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                   FILE_PATH_LITERAL("--switch2=value")));
}

TEST(CommandLineTest, RemoveSwitchWithValue) {
  const std::string switch1 = "switch1";
  const std::string switch2 = "switch2";
  const std::string value2 = "value";

  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch(switch1);
  cl.AppendSwitchASCII(switch2, value2);

  EXPECT_TRUE(cl.HasSwitch(switch1));
  EXPECT_TRUE(cl.HasSwitch(switch2));
  EXPECT_EQ(value2, cl.GetSwitchValueASCII(switch2));
  EXPECT_THAT(cl.argv(),
              testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                   FILE_PATH_LITERAL("--switch1"),
                                   FILE_PATH_LITERAL("--switch2=value")));

  cl.RemoveSwitch(switch2);

  EXPECT_TRUE(cl.HasSwitch(switch1));
  EXPECT_FALSE(cl.HasSwitch(switch2));
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                              FILE_PATH_LITERAL("--switch1")));
}

TEST(CommandLineTest, RemoveSwitchDropsMultipleSameSwitches) {
  const std::string switch1 = "switch1";
  const std::string value2 = "value2";

  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch(switch1);
  cl.AppendSwitchASCII(switch1, value2);

  EXPECT_TRUE(cl.HasSwitch(switch1));
  EXPECT_EQ(value2, cl.GetSwitchValueASCII(switch1));
  EXPECT_THAT(cl.argv(),
              testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                   FILE_PATH_LITERAL("--switch1"),
                                   FILE_PATH_LITERAL("--switch1=value2")));

  cl.RemoveSwitch(switch1);

  EXPECT_FALSE(cl.HasSwitch(switch1));
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program")));
}

TEST(CommandLineTest, AppendAndRemoveSwitchWithDefaultPrefix) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch("foo");
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                              FILE_PATH_LITERAL("--foo")));
  EXPECT_EQ(0u, cl.GetArgs().size());

  cl.RemoveSwitch("foo");
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program")));
  EXPECT_EQ(0u, cl.GetArgs().size());
}

TEST(CommandLineTest, AppendAndRemoveSwitchWithAlternativePrefix) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch("-foo");
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                              FILE_PATH_LITERAL("-foo")));
  EXPECT_EQ(0u, cl.GetArgs().size());

  cl.RemoveSwitch("foo");
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program")));
  EXPECT_EQ(0u, cl.GetArgs().size());
}

TEST(CommandLineTest, AppendAndRemoveSwitchPreservesOtherSwitchesAndArgs) {
  CommandLine cl(FilePath(FILE_PATH_LITERAL("Program")));

  cl.AppendSwitch("foo");
  cl.AppendSwitch("bar");
  cl.AppendArg("arg");
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                              FILE_PATH_LITERAL("--foo"),
                                              FILE_PATH_LITERAL("--bar"),
                                              FILE_PATH_LITERAL("arg")));
  EXPECT_THAT(cl.GetArgs(), testing::ElementsAre(FILE_PATH_LITERAL("arg")));

  cl.RemoveSwitch("foo");
  EXPECT_THAT(cl.argv(), testing::ElementsAre(FILE_PATH_LITERAL("Program"),
                                              FILE_PATH_LITERAL("--bar"),
                                              FILE_PATH_LITERAL("arg")));
  EXPECT_THAT(cl.GetArgs(), testing::ElementsAre(FILE_PATH_LITERAL("arg")));
}

TEST(CommandLineTest, MultipleSameSwitch) {
  const CommandLine::CharType* argv[] = {
      FILE_PATH_LITERAL("program"),
      FILE_PATH_LITERAL("--foo=one"),  // --foo first time
      FILE_PATH_LITERAL("-baz"),
      FILE_PATH_LITERAL("--foo=two")  // --foo second time
  };
  CommandLine cl(std::size(argv), argv);

  EXPECT_TRUE(cl.HasSwitch("foo"));
  EXPECT_TRUE(cl.HasSwitch("baz"));

  EXPECT_EQ("two", cl.GetSwitchValueASCII("foo"));
}

// Helper class for the next test case
class MergeDuplicateFoosSemicolon : public DuplicateSwitchHandler {
 public:
  ~MergeDuplicateFoosSemicolon() override;

  void ResolveDuplicate(base::StringPiece key,
                        CommandLine::StringPieceType new_value,
                        CommandLine::StringType& out_value) override;
};

MergeDuplicateFoosSemicolon::~MergeDuplicateFoosSemicolon() = default;

void MergeDuplicateFoosSemicolon::ResolveDuplicate(
    base::StringPiece key,
    CommandLine::StringPieceType new_value,
    CommandLine::StringType& out_value) {
  if (key != "mergeable-foo") {
    out_value = CommandLine::StringType(new_value);
    return;
  }
  if (!out_value.empty()) {
#if BUILDFLAG(IS_WIN)
    StrAppend(&out_value, {L";"});
#else
    StrAppend(&out_value, {";"});
#endif
  }
  StrAppend(&out_value, {new_value});
}

// This flag is an exception to the rule that the second duplicate flag wins
// Not thread safe
TEST(CommandLineTest, MultipleFilterFileSwitch) {
  const CommandLine::CharType* const argv[] = {
      FILE_PATH_LITERAL("program"),
      FILE_PATH_LITERAL("--mergeable-foo=one"),  // --first time
      FILE_PATH_LITERAL("-baz"),
      FILE_PATH_LITERAL("--mergeable-foo=two")  // --second time
  };
  CommandLine::SetDuplicateSwitchHandler(
      std::make_unique<MergeDuplicateFoosSemicolon>());

  CommandLine cl(std::size(argv), argv);

  EXPECT_TRUE(cl.HasSwitch("mergeable-foo"));
  EXPECT_TRUE(cl.HasSwitch("baz"));

  EXPECT_EQ("one;two", cl.GetSwitchValueASCII("mergeable-foo"));
  CommandLine::SetDuplicateSwitchHandler(nullptr);
}

#if BUILDFLAG(IS_WIN)
TEST(CommandLineTest, ParseAsSingleArgument) {
  CommandLine cl = CommandLine::FromString(
      FILE_PATH_LITERAL("program --switch_before arg_before "
                        "--single-argument arg with spaces \"and quotes\" \""));

  EXPECT_FALSE(cl.GetCommandLineString().empty());
  EXPECT_EQ(FilePath(FILE_PATH_LITERAL("program")), cl.GetProgram());
  EXPECT_TRUE(cl.HasSwitch("switch_before"));
  EXPECT_EQ(cl.GetArgs(), CommandLine::StringVector({FILE_PATH_LITERAL(
                              "arg with spaces \"and quotes\" \"")}));

  CommandLine cl_without_arg =
      CommandLine::FromString(FILE_PATH_LITERAL("program --single-argument "));

  EXPECT_FALSE(cl_without_arg.GetCommandLineString().empty());
  EXPECT_EQ(FilePath(FILE_PATH_LITERAL("program")),
            cl_without_arg.GetProgram());
  EXPECT_TRUE(cl_without_arg.GetArgs().empty());
}
#endif  // BUILDFLAG(IS_WIN)

#if BUILDFLAG(ENABLE_COMMANDLINE_SEQUENCE_CHECKS)
TEST(CommandLineDeathTest, ThreadChecks) {
  test::TaskEnvironment task_environment;
  RunLoop run_loop;
  EXPECT_DEATH_IF_SUPPORTED(
      {
        ThreadPool::PostTask(FROM_HERE, BindLambdaForTesting([&run_loop]() {
                               auto* command_line =
                                   CommandLine::ForCurrentProcess();
                               command_line->AppendSwitch("test");
                               run_loop.Quit();
                             }));

        run_loop.Run();
      },
      "");
}
#endif  // BUILDFLAG(ENABLE_COMMANDLINE_SEQUENCE_CHECKS)

}  // namespace base