A proven working software stack for running automated tests with the following order of components: Gherkin ▸ Behat ▸ Mink ▸ Selenium ▸ WebDriver ▸ Facebook's PHP-binding ▸ ChromeDriver ▸ Google Chrome ▸ on mac OS.
See the composer.json file for further details.
Initial foundation of this stack was based on the toolset introduced in the Behat 101 - Introduction screencast by @jcowie and @allanmacgregor on YouTube. I'm so thankful for them to shed some lights on a working combination.