Behat/MinkExtension-example — pull request #4 by MatthewKBabbs (2012-07-12 15:18:53+00:00)
Title: Composer reports unresolved dependencies on mink-goutte-driver

Installing mink-goutte-driver used to lead to "unresolved dependency" messages. This is because the version of Goutte (fabpot/goutte) on Packagist requires several @dev channel packages. Changes to composer.json prevent the error messages by requesting the required packages directly.

Maybe there's a better way than just asking for the extra packages, but this worked for me.