This extension requires:

• PHP 5.3.x or higher
• Behat 3.x or higher

$ composer require --dev dizzy7/behat-junit-formatter

Activate the extension by specifying its class in your behat.yml:

# behat.yml
default:
    suites:
    ...

    extensions:
        dizzy7\JUnitFormatter\JUnitFormatterExtension:
            filename: report.xml
            outputDir: %paths.base%/build/tests
    ...

• filename - filename (not used if realtime flag is on)
• outputDir - dir to be created filename

you also could use BEHAT_JUNIT_FILENAME and BEHAT_JUNIT_OUTPUTDIR env variables

Feel free to Create a new issue.

Thanks to emuse html extension that inspired me to created this one.