MDL-41811 navigation: Load site admin navigation

Go to notification page before following links within site admin
navigation, ensuring site admin navigation is loaded

With no js, test should follow site admin link and not expand it.

admin/tests/behat/behat_admin.php

@@ -28,7 +28,8 @@
 require_once(__DIR__ . '/../../../lib/behat/behat_base.php');
 require_once(__DIR__ . '/../../../lib/behat/behat_field_manager.php');
 
-use Behat\Gherkin\Node\TableNode as TableNode,
+use Behat\Behat\Context\Step\Given as Given,
+    Behat\Gherkin\Node\TableNode as TableNode,
     Behat\Mink\Exception\ElementNotFoundException as ElementNotFoundException;
 
 /**
@@ -110,4 +111,23 @@ class behat_admin extends behat_base {
             $this->getSession()->wait($timeout, $javascript);
         }
     }
+
+    /**
+     * Goes to notification page ensuring site admin navigation is loaded.
+     *
+     * @Given /^I go to notifications page$/
+     * @return Given[]
+     */
+    public function i_go_to_notifications_page() {
+        if ($this->running_javascript()) {
+            return array(
+                new Given('I expand "' . get_string('administrationsite') . '" node'),
+                new Given('I follow "' . get_string('notifications') . '"')
+            );
+        } else {
+            return array(
+                new Given('I follow "' . get_string('administrationsite') . '"')
+            );
+        }
+    }
 }