Rails5 fix user sees revert modal spec

changelogs/unreleased/rails5-fix-revert-modal-spec.yml

+---
+title: Rails5 fix user sees revert modal spec
+merge_request: 20706
+author: Jasper Maes
+type: fixed

spec/features/user_sees_revert_modal_spec.rb

@@ -9,6 +9,9 @@ describe 'Merge request > User sees revert modal', :js do
     sign_in(user)
     visit(project_merge_request_path(project, merge_request))
     click_button('Merge')
+
+    wait_for_requests
+
     visit(merge_request_path(merge_request))
     click_link('Revert')
   end