Issue #1866804 by damiankloip: Expand test coverage for ViewExecutable().

core/modules/views/tests/views_test_config/test_views/views.view.test_executable_displays.yml

@@ -9,10 +9,10 @@ display:
     display_title: Master
     id: default
     position: '0'
-  page:
+  page_1:
     display_plugin: page
     display_title: Page
-    id: page
+    id: page_1
     position: '1'
   page_2:
     display_plugin: page