Avoid ambiguity, which happened in a single test run

app/controllers/projects/issues_controller.rb

@@ -212,7 +212,7 @@ class Projects::IssuesController < Projects::ApplicationController
   end
   def create_merge_request
-    result = MergeRequests::CreateFromIssueService.new(project, current_user, issue_iid: issue.iid).execute
+    result = ::MergeRequests::CreateFromIssueService.new(project, current_user, issue_iid: issue.iid).execute
     if result[:status] == :success
       render json: MergeRequestCreateSerializer.new.represent(result[:merge_request])