MDL-78782 behat: optimize with editing mode step

The current I am on course homepage with editing mode loads twice the
course page. This patch prevents this from happening by going directly
to editmode.php.

editmode.php

@@ -28,7 +28,12 @@
 $contextid = required_param('context', PARAM_INT);
 $pageurl = required_param('pageurl', PARAM_LOCALURL);
 
-require_sesskey();
+// Behat requires JS to get the session. To allow goutte
+// to enable edit mode sesskey validation is skipped for behat scripts.
+if (!defined('BEHAT_SITE_RUNNING')) {
+    require_sesskey();
+}
+
 require_login();
 
 $context = \context_helper::instance_by_id($contextid);

lib/tests/behat/behat_navigation.php

@@ -970,22 +970,20 @@ public function i_am_on_course_homepage_with_editing_mode_on($coursefullname) {
      * @param string $onoroff Whehter to switch editing on, or off.
      */
     public function i_am_on_course_homepage_with_editing_mode_set_to(string $coursefullname, string $onoroff): void {
-        $courseid = $this->get_course_id($coursefullname);
-        $url = new moodle_url('/course/view.php', ['id' => $courseid]);
-
-        // Visit the course page.
-        $this->execute('behat_general::i_visit', [$url]);
-
-        switch ($onoroff) {
-            case 'on':
-                $this->execute('behat_navigation::i_turn_editing_mode_on');
-                break;
-            case 'off':
-                $this->execute('behat_navigation::i_turn_editing_mode_off');
-                break;
-            default:
-                throw new \coding_exception("Unknown editing mode '{$onoroff}'. Accepted values are 'on' and 'off'");
+        if ($onoroff !== 'on' && $onoroff !== 'off') {
+            throw new coding_exception("Unknown editing mode '{$onoroff}'. Accepted values are 'on' and 'off'");
         }
+
+        $courseid = $this->get_course_id($coursefullname);
+        $context = context_course::instance($courseid);
+        $courseurl = new moodle_url('/course/view.php', ['id' => $courseid]);
+
+        $editmodeurl = new moodle_url('/editmode.php', [
+            'context' => $context->id,
+            'pageurl' => $courseurl->out(true),
+            'setmode' => ($onoroff === 'on' ? 1 : 0),
+        ]);
+        $this->execute('behat_general::i_visit', [$editmodeurl]);
     }
 
     /**