MAGETWO-63716: Add target to admin menu element

Author: olysenko

dev/tests/integration/testsuite/Magento/Backend/Model/MenuTest.php

@@ -117,7 +117,7 @@ public function testSerialize()
         $expected = '[{"parent_id":null,"module_name":"Magento_Backend","sort_index":null,"depends_on_config":null,'
             . '"id":"Magento_Backend::system3","resource":"Magento_Backend::system3","path":"","action":null,'
             . '"depends_on_module":null,"tooltip":"","title":"Extended System",'
-            . '"sub_menu":[{"parent_id":null,"module_name":"Magento_Backend","sort_index":null,'
+            . '"target":null,"sub_menu":[{"parent_id":null,"module_name":"Magento_Backend","sort_index":null,'
             . '"depends_on_config":null,"id":"Magento_Backend::system3_acl","resource":"Magento_Backend::system3_acl",'
             . '"path":"","action":"admin\/backend\/acl\/index","depends_on_module":null,"tooltip":"","title":"Acl",'
             . '"target":null,"sub_menu":null}]}]';
@@ -132,7 +132,7 @@ public function testUnserialize()
         $serializedMenu = '[{"parent_id":null,"module_name":"Magento_Backend","sort_index":null,'
             . '"depends_on_config":null,"id":"Magento_Backend::system3","resource":"Magento_Backend::system3",'
             . '"path":"","action":null,"depends_on_module":null,"tooltip":"","title":"Extended System",'
-            . '"sub_menu":[{"parent_id":null,"module_name":"Magento_Backend","sort_index":null,'
+            . '"target":null,"sub_menu":[{"parent_id":null,"module_name":"Magento_Backend","sort_index":null,'
             . '"depends_on_config":null,"id":"Magento_Backend::system3_acl","resource":"Magento_Backend::system3_acl",'
             . '"path":"","action":"admin\/backend\/acl\/index","depends_on_module":null,"tooltip":"","title":"Acl",'
             . '"target":null,"sub_menu":null}]}]';
@@ -152,6 +152,7 @@ public function testUnserialize()
                 'depends_on_module' => null,
                 'tooltip' => '',
                 'title' => 'Extended System',
+                'target' => null,
                 'sub_menu' =>
                     [
                         [
@@ -167,6 +168,7 @@ public function testUnserialize()
                             'tooltip' => '',
                             'title' => 'Acl',
                             'sub_menu' => null,
+                            'target' => null
                         ],
                     ],
             ],