Fixed MergeRequestController spec

CHANGELOG

@@ -7,6 +7,7 @@ v 8.7.0 (unreleased)
   - Expose label description in API (Mariusz Jachimowicz)
   - Allow back dating on issues when created through the API
   - Fix avatar stretching by providing a cropping feature
+  - Fix raw/rendered diff producing different results on merge requests !3450
   - Add links to CI setup documentation from project settings and builds pages
   - Handle nil descriptions in Slack issue messages (Stan Hu)
   - Implement 'Groups View' as an option for dashboard preferences !3379 (Elias W.)

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -63,7 +63,7 @@ describe Projects::MergeRequestsController do
             id: merge_request.iid,
             format: format)
 
-        expect(response.body).to eq((merge_request.send(:"to_#{format}",user)).to_s)
+        expect(response.body).to eq((merge_request.send(:"to_#{format}")).to_s)
       end
 
       it "should not escape Html" do