Fix style

doc/api/merge_requests.md

@@ -444,8 +444,6 @@ Parameters:
 - `id` (required) - The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user
 - `merge_request_iid` (required) - The internal ID of the merge request
 
-Example of response
-
 ```json
 [
   {

lib/api/merge_requests.rb

@@ -24,8 +24,9 @@ module API
           .preload(:notes, :author, :assignee, :milestone, :latest_merge_request_diff, :labels, :timelogs)
       end
 
-      def merge_request_pipelines_with_access(access_level = :read_pipeline)
+      def merge_request_pipelines_with_access
-        authorize! access_level, user_project
+        authorize! :read_pipeline, user_project
+
         mr = find_merge_request_with_access(params[:merge_request_iid])
         mr.all_pipelines
       end

spec/requests/api/merge_requests_spec.rb

@@ -546,6 +546,12 @@ describe API::MergeRequests do
         expect(response).to have_gitlab_http_status(200)
         expect(response).to match_response_schema('public_api/v4/pipelines')
       end
+
+      it 'returns 404 if MR does not exist' do
+        get api("/projects/#{project.id}/merge_requests/777/pipelines")
+
+        expect(response).to have_gitlab_http_status(404)
+      end
     end
 
     context 'when unauthorized' do