MDL-39441 behat: New setting to expand the list of allowed settings

config-dist.php

@@ -631,6 +631,11 @@ $CFG->admin = 'admin';
 // Example:
 //   $CFG->behat_restart_browser_after = 7200;     // Restarts the browser session after 2 hours
 //
+// All this page's extra Moodle settings are compared against a white list of allowed settings
+// (the basic and behat_* ones) to avoid problems with production environments. This setting can be
+// used to expand the default white list with an array of extra settings.
+// Example:
+//   $CFG->behat_extraallowedsettings = array('logsql', 'dblogerror');
 
 //=========================================================================
 // ALL DONE!  To continue installation, visit your main page with a browser

lib/behat/lib.php

@@ -160,6 +160,11 @@ function behat_clean_init_config() {
         'theme'
     ));
 
+    // Add extra allowed settings.
+    if (!empty($CFG->behat_extraallowedsettings)) {
+        $allowed = array_merge($allowed, array_flip($CFG->behat_extraallowedsettings));
+    }
+
     // Also allowing behat_ prefixed attributes.
     foreach ($CFG as $key => $value) {
         if (!isset($allowed[$key]) && strpos($key, 'behat_') !== 0) {