Find dropdown-menu before asserting active item in sidebar_spec.rb

spec/features/boards/sidebar_spec.rb

@@ -164,7 +164,7 @@ describe 'Issue Boards', feature: true, js: true do
       page.within('.assignee') do
         click_link 'Edit'
     
-        expect(page).to have_selector('.is-active')
+        expect(find('.dropdown-menu')).to have_selector('.is-active')
       end
     end
   end