Drop your current behat test site php admin/tool/behat/cli/util.php --drop Run php admin/tool/behat/cli/util.php --diag You SHOULD see a message stating that you need to install your behat test site Delete completely your $CFG->behat_dataroot directory, you don't need to change the $CFG->behat_dataroot value Run php admin/tool/behat/cli/init.php Your test site SHOULD be installed and you SHOULD see The table names A Acceptance tests site installed message A Acceptance tests environment enabled, to run the tests use: followed by the command Run php admin/tool/behat/cli/util.php --diag You SHOULD NOT see any output Edit your $CFG->dirroot/version.php and change the moodle version to 2014010100 or something in the future (while this is changed don't access your normal moodle site or you will have to upgrade the site and edit the database when the tests are finished) Run again php admin/tool/behat/cli/init.php You SHOULD see the ........... with Acceptance tests site dropped followed by the installation and enable output you have seen before Run php admin/tool/behat/cli/util.php --diag You SHOULD NOT see any output Restore your $CFG->dirroot/version.php git checkout version.php Run php admin/tool/behat/cli/util.php --drop Browse your regular moodle site and go to Site administration -> Development -> Acceptance testing You SHOULD see a list of steps Delete your $CFG->dirroot/vendor and $CFG->dirroot/composer.lock files, but keep composer.phar Browse your regular moodle site and go to Site administration -> Development -> Acceptance testing You SHOULD see "Something is wrong with the setup, ensure you ran the composer installer and vendor/bin/behat file has execution permissions. More info in http://docs.moodle.org/dev/Acceptance_testing#Installation " Run php admin/tool/behat/cli/util.php --diag You SHOULD see "Something is wrong with the setup, ensure you ran the composer installer and vendor/bin/behat file has execution permissions. More info in http://docs.moodle.org/dev/Acceptance_testing#Installation " Run again php admin/tool/behat/cli/init.php It SHOULD install composer dependencies, install the test site and enable the behat test environment according to your config.php values Run php admin/tool/behat/cli/util.php --diag You SHOULD NOT see any output Run the test suite All tests SHOULD pass We are not testing without composer.phar because it can fail depending on different things ( http://docs.moodle.org/dev/Acceptance_testing#Installation )