[TASK] Ensure that logout action of UAT is executed in correct frame

The logout action of the user acceptance tests must be executed
on the main page frame. We must ensure that we are in the correct
frame inside of this action.

Change-Id: Ied588442516513138f16da4037e29fa56f3f1399
Resolves: #75528
Releases: master
Reviewed-on: https://review.typo3.org/47585


Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Dirk Jüttner <dirk.juettner@gmail.com>
Tested-by: Dirk Jüttner <dirk.juettner@gmail.com>
Reviewed-by: Sascha Egerer <sascha@sascha-egerer.de>
Tested-by: Sascha Egerer <sascha@sascha-egerer.de>

typo3/sysext/core/Tests/Acceptance/Step/Backend/Kasper.php

@@ -50,6 +50,8 @@ class Kasper extends \AcceptanceTester
         $I = $this;
         $I->amGoingTo('step backend login');
         $I->amGoingTo('logout');
+        // ensure that we are on the main frame
+        $I->switchToIFrame();
         $I->click('#typo3-cms-backend-backend-toolbaritems-usertoolbaritem > a');
         $I->click('Logout');
         $I->waitForElement('#t3-username');