MC-33069: Stabilize Unit tests

Author: SeruyV

lib/internal/Magento/Framework/App/Route/Config.php

@@ -101,7 +101,7 @@ protected function _getRoutes($scope = null)
      * Retrieve route front name
      *
      * @param string $routeId
-     * @param null $scope
+     * @param null|string $scope
      * @return string
      */
     public function getRouteFrontName($routeId, $scope = null)
@@ -111,6 +111,8 @@ public function getRouteFrontName($routeId, $scope = null)
     }
 
     /**
+     * @inheritdoc
+     *
      * @param string $frontName
      * @param string $scope
      * @return bool|int|string
@@ -127,6 +129,8 @@ public function getRouteByFrontName($frontName, $scope = null)
     }
 
     /**
+     * @inheritdoc
+     *
      * @param string $frontName
      * @param string $scope
      * @return string[]