How to use the nox.__main__.main function in nox

def test_main_noxfile_options_sessions(monkeypatch):
    monkeypatch.setattr(
        sys,
        "argv",
        ["nox", "-l", "--noxfile", os.path.join(RESOURCES, "noxfile_options.py")],
    )

    with mock.patch("nox.tasks.honor_list_request") as honor_list_request:
        honor_list_request.return_value = 0

        with mock.patch("sys.exit"):
            nox.__main__.main()

        assert honor_list_request.called

        # Verify that the config looks correct.
        config = honor_list_request.call_args[1]["global_config"]
        assert config.sessions == ["test"]

def test_main_color_conflict(capsys, monkeypatch):
    monkeypatch.setattr(sys, "argv", [sys.executable, "--forcecolor", "--nocolor"])
    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 1

        # Call the main function.
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_with(1)

    _, err = capsys.readouterr()

    assert "color" in err

def test_main_short_form_args(monkeypatch):
    monkeypatch.setattr(
        sys, "argv", [sys.executable, "-f", "noxfile.py", "-s", "1", "2", "-r"]
    )
    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 0

        # Call the main function.
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_once_with(0)
        assert execute.called

        # Verify that the config looks correct.
        config = execute.call_args[1]["global_config"]
        assert config.noxfile == "noxfile.py"
        assert config.sessions == ["1", "2"]
        assert config.reuse_existing_virtualenvs is True

def test_main_positional_with_double_hyphen(monkeypatch):
    monkeypatch.setattr(sys, "argv", [sys.executable, "--", "1", "2", "3"])
    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 0

        # Call the main function.
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_once_with(0)
        assert execute.called

        # Verify that the positional args are listed in the config.
        config = execute.call_args[1]["global_config"]
        assert config.posargs == ["1", "2", "3"]

def test_main_no_args(monkeypatch):
    monkeypatch.setattr(sys, "argv", [sys.executable])
    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 0

        # Call the function.
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_once_with(0)
        assert execute.called

        # Verify that the config looks correct.
        config = execute.call_args[1]["global_config"]
        assert config.noxfile == "noxfile.py"
        assert config.sessions is None
        assert not config.reuse_existing_virtualenvs
        assert not config.stop_on_first_error
        assert config.posargs == []

"argv",
        [
            "nox",
            "-l",
            "-s",
            "test",
            "--noxfile",
            os.path.join(RESOURCES, "noxfile_options.py"),
        ],
    )

    with mock.patch("nox.tasks.honor_list_request") as honor_list_request:
        honor_list_request.return_value = 0

        with mock.patch("sys.exit"):
            nox.__main__.main()

        assert honor_list_request.called

        # Verify that the config looks correct.
        config = honor_list_request.call_args[1]["global_config"]
        assert config.reuse_existing_virtualenvs is True

def test_main_failure(monkeypatch):
    monkeypatch.setattr(sys, "argv", [sys.executable])
    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 1
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_once_with(1)

def test_main_session_from_nox_env_var(monkeypatch, env, sessions):
    monkeypatch.setenv("NOXSESSION", env)
    monkeypatch.setattr(sys, "argv", [sys.executable])

    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 0

        # Call the main function.
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_once_with(0)
        assert execute.called

        # Verify that the sessions from the env var are listed in the config.
        config = execute.call_args[1]["global_config"]
        assert len(config.sessions) == len(sessions)
        for session in sessions:
            assert session in config.sessions

def test_main_explicit_sessions_with_spaces_in_names(monkeypatch):
    monkeypatch.setattr(
        sys, "argv", [sys.executable, "-e", "unit tests", "the unit tests"]
    )
    with mock.patch("nox.workflow.execute") as execute:
        execute.return_value = 0

        # Call the main function.
        with mock.patch.object(sys, "exit") as exit:
            nox.__main__.main()
            exit.assert_called_once_with(0)
        assert execute.called

        # Verify that the explicit sessions are listed in the config.
        config = execute.call_args[1]["global_config"]
        assert config.sessions == ["unit tests", "the unit tests"]

def test_main_positional_args(capsys, monkeypatch):
    fake_exit = mock.Mock(side_effect=ValueError("asdf!"))

    monkeypatch.setattr(sys, "argv", [sys.executable, "1", "2", "3"])
    with mock.patch.object(sys, "exit", fake_exit), pytest.raises(
        ValueError, match="asdf!"
    ):
        nox.__main__.main()
    _, stderr = capsys.readouterr()
    assert "Unknown argument(s) '1 2 3'" in stderr
    fake_exit.assert_called_once_with(2)

    fake_exit.reset_mock()
    monkeypatch.setattr(sys, "argv", [sys.executable, "1", "2", "3", "--"])
    with mock.patch.object(sys, "exit", fake_exit), pytest.raises(
        ValueError, match="asdf!"
    ):
        nox.__main__.main()
    _, stderr = capsys.readouterr()
    assert "Unknown argument(s) '1 2 3'" in stderr
    fake_exit.assert_called_once_with(2)