# init, key specification long and short option

    ("gimmecert.cli.init", ["gimmecert", "init", "--key-specification", "rsa:4096"]),

    ("gimmecert.cli.init", ["gimmecert", "init", "-k", "rsa:4096"]),

# List of _invalid_ CLI invocations to use in

# test_invalid_parser_commands_and_options_produce_error.

#

# Each element in this list should be a tuple where first element is

# the command function (relative to CLI module) that should be mocked,

# while second element is list of CLI arguments for invoking the

# command from CLI. See test documentation for more details.

INVALID_CLI_INVOCATIONS = [

    # init, invalid key specification

    ("gimmecert.cli.init", ["gimmecert", "init", "-k", "rsa"]),

    ("gimmecert.cli.init", ["gimmecert", "init", "-k", "rsa:not_a_number"]),

    ("gimmecert.cli.init", ["gimmecert", "init", "-k", "unsupported:algorithm"]),

]

@pytest.mark.parametrize("command_function, cli_invocation", INVALID_CLI_INVOCATIONS)

def test_invalid_parser_commands_and_options_produce_error(tmpdir, command_function, cli_invocation):

    """

    Tests handling of invalid CLI invocations by top-level and command

    parsers.

    This test helps greatly reduce duplication of code, at the expense

    of some flexibility.

    The passed-in command_function is mocked and set-up to return a

    success exit code, since the main point is to ensure the CLI

    supports specific commands and parameters. E.g. the parser should

    be the one producing errors.

    To add a new valid invocation of CLI, update the

    INVALID_CLI_INVOCATIONS variable above.

    """

    # This should ensure we don't accidentally create artifacts

    # outside of test directory.

    tmpdir.chdir()

    with mock.patch(command_function) as mock_command_function, mock.patch('sys.argv', cli_invocation):

        mock_command_function.return_value = gimmecert.commands.ExitCode.SUCCESS

        with pytest.raises(SystemExit) as e_info:

            gimmecert.cli.main()

        assert e_info.value.code == gimmecert.commands.ExitCode.ERROR_ARGUMENTS

@mock.patch('gimmecert.cli.KeyGenerator')

def test_init_command_invoked_with_correct_parameters_no_options(mock_key_generator, mock_init, tmpdir):

    mock_key_generator.return_value = mock.Mock()

    mock_key_generator.assert_called_once_with("rsa:2048")

    mock_init.assert_called_once_with(sys.stdout, sys.stderr, tmpdir.strpath, tmpdir.basename, default_depth, mock_key_generator.return_value)

@mock.patch('gimmecert.cli.KeyGenerator')

def test_init_command_invoked_with_correct_parameters_with_options(mock_key_generator, mock_init, tmpdir):

    mock_key_generator.return_value = mock.Mock()

    mock_init.assert_called_once_with(sys.stdout, sys.stderr, tmpdir.strpath, 'My Project', default_depth, mock_key_generator.return_value)