SystemPropertiesCommandLineConverter propertiesCommandLineConverter = new SystemPropertiesCommandLineConverter();
        CommandLineParser parser = new CommandLineParser().allowUnknownOptions().allowMixedSubcommandsAndOptions();

        converter.configure(parser);
        propertiesCommandLineConverter.configure(parser);

        List<String> arguments = parameters.getArguments();

        loggingConfigurationCommandLineConverter.configure(parser);
        parallelConfigurationCommandLineConverter.configure(parser);
        projectPropertiesCommandLineConverter.configure(parser);
        parser.allowMixedSubcommandsAndOptions();
        buildOptionsConverter.configure(parser);
    }

        when:
        parser.allowMixedSubcommandsAndOptions()
        result = parser.parse(['a', '--option', 'b'])

        then:
        result.extraArguments == ['a', '--option', 'b']
    }

    def canCombineSubcommandShortOptionWithOtherShortOptions() {
        parser.option('b')
        parser.allowMixedSubcommandsAndOptions()

        when:

            buildLayoutConverter.configure(parser);
            loggingBuildOptions.configure(parser);

            parser.allowUnknownOptions();
            parser.allowMixedSubcommandsAndOptions();

            WelcomeMessageConfiguration welcomeMessageConfiguration = new WelcomeMessageConfiguration(WelcomeMessageDisplayMode.ONCE);

            try {

                parseState = parseState.onNonOption(arg);
            }
        }

        parseState.onCommandLineEnd();
        return parsedCommandLine;
    }

    public CommandLineParser allowMixedSubcommandsAndOptions() {
        allowMixedOptions = true;
        return this;
    }

    public CommandLineParser allowUnknownOptions() {
        allowUnknownOptions = true;
        return this;
    }

        CommandLineParser commandLineParser = new CommandLineParser();
        commandLineParser.allowUnknownOptions();
        commandLineParser.allowMixedSubcommandsAndOptions();

        InitialPropertiesConverter initialPropertiesConverter = new InitialPropertiesConverter();
        BuildLayoutConverter buildLayoutConverter = new BuildLayoutConverter();