MDL-69072 behat: Remove restart_browser_after feature

This is no longer required as the Mink session is restarted after every
test regardless.

config-dist.php

@@ -777,13 +777,6 @@ $CFG->admin = 'admin';
 //     ),
 // );
 //
-// You can force the browser session (not user's sessions) to restart after N seconds. This could
-// be useful if you are using a cloud-based service with time restrictions in the browser side.
-// Setting this value the browser session that Behat is using will be restarted. Set the time in
-// seconds. Is not recommended to use this setting if you don't explicitly need it.
-// 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.

lib/tests/behat/behat_hooks.php

@@ -63,11 +63,6 @@ use Behat\Testwork\Hook\Scope\BeforeSuiteScope,
  */
 class behat_hooks extends behat_base {
 
-    /**
-     * @var Last browser session start time.
-     */
-    protected static $lastbrowsersessionstart = 0;
-
     /**
      * @var For actions that should only run once.
      */
@@ -191,12 +186,6 @@ class behat_hooks extends behat_base {
         // Avoid parallel tests execution, it continues when the previous lock is released.
         test_lock::acquire('behat');
 
-        // Store the browser reset time if reset after N seconds is specified in config.php.
-        if (!empty($CFG->behat_restart_browser_after)) {
-            // Store the initial browser session opening.
-            self::$lastbrowsersessionstart = time();
-        }
-
         if (!empty($CFG->behat_faildump_path) && !is_writable($CFG->behat_faildump_path)) {
             throw new behat_stop_exception('You set $CFG->behat_faildump_path to a non-writable directory');
         }
@@ -374,15 +363,6 @@ class behat_hooks extends behat_base {
         $user = $DB->get_record('user', array('username' => 'admin'));
         \core\session\manager::set_user($user);
 
-        // Reset the browser if specified in config.php.
-        if (!empty($CFG->behat_restart_browser_after) && $this->running_javascript()) {
-            $now = time();
-            if (self::$lastbrowsersessionstart + $CFG->behat_restart_browser_after < $now) {
-                $session->restart();
-                self::$lastbrowsersessionstart = $now;
-            }
-        }
-
         // Set the theme if not default.
         if ($suitename !== "default") {
             set_config('theme', $suitename);

lib/upgrade.txt

@@ -1,6 +1,10 @@
 This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
+=== 3.5.11 ===
+* The `$CFG->behat_retart_browser_after` configuration setting has been removed.
+  The browser session is now restarted between all tests.
+
 === 3.5.10 ===
 
 * behat_data_generators::the_following_exist() has been removed, please use