return Optional.of(commandLine.getOptionValue(CLIManager.THREADS));
        }
        return Optional.empty();
    }

    @Override
    public Optional<String> builder() {
        if (commandLine.hasOption(CLIManager.BUILDER)) {
            return Optional.of(commandLine.getOptionValue(CLIManager.BUILDER));
        }
        return Optional.empty();
    }

            return Optional.of(commandLine.getOptionValue(CLIManager.ALTERNATE_USER_SETTINGS));
        }
        return Optional.empty();
    }

    @Override
    public Optional<String> altProjectSettings() {
        if (commandLine.hasOption(CLIManager.ALTERNATE_PROJECT_SETTINGS)) {
            return Optional.of(commandLine.getOptionValue(CLIManager.ALTERNATE_PROJECT_SETTINGS));
        }

        MavenExecutionRequest request = cliRequest.getRequest();

        File userSettingsFile;

        if (commandLine.hasOption(CLIManager.ALTERNATE_USER_SETTINGS)) {
            userSettingsFile = new File(commandLine.getOptionValue(CLIManager.ALTERNATE_USER_SETTINGS));
            userSettingsFile = resolveFile(userSettingsFile, workingDirectory);

            if (!userSettingsFile.isFile()) {

        assertEquals("multithreaded", request.commandLine.getOptionValue(CLIManager.BUILDER));
        assertEquals("8", request.commandLine.getOptionValue(CLIManager.THREADS));

        // override from command line
        request = new CliRequest(new String[] {"--builder", "foobar"}, null);
        cli.cli(request);
        assertEquals("foobar", request.commandLine.getOptionValue("builder"));
    }

    @Test

            return Optional.of(commandLine.getOptionValue(CLIManager.MODEL_VERSION));
        }
        return Optional.empty();
    }

    @Override
    @Nonnull
    public Optional<String> directory() {
        if (commandLine.hasOption(CLIManager.DIRECTORY)) {
            return Optional.of(commandLine.getOptionValue(CLIManager.DIRECTORY));
        }
        return Optional.empty();
    }

        request.setResumeFrom(commandLine.getOptionValue(CLIManager.RESUME_FROM));
        enableOnPresentOption(commandLine, CLIManager.RESUME, request::setResume);
        request.setMakeBehavior(determineMakeBehavior(commandLine));
        boolean cacheNotFound = !commandLine.hasOption(CLIManager.CACHE_ARTIFACT_NOT_FOUND)
                || Boolean.parseBoolean(commandLine.getOptionValue(CLIManager.CACHE_ARTIFACT_NOT_FOUND));