The Drupal Extension is an integration layer between Behat, Mink Extension, and Drupal. It provides step definitions for common testing scenarios specific to Drupal sites.
The Drupal Extension 3.0 supports Drupal 7 and 8, and utilizes Behat 3. For Drupal 6 support (or Behat 2), use the 1.0 version.
The main repository is on github, mirrored here for convenience. Pull requests on github are preferred for bug fixes and feature additions, since automated tests are run. Support requests are welcome here.