Add spec for developer role and asser for changed attribute

spec/requests/api/error_tracking_spec.rb

@@ -112,6 +112,24 @@ describe API::ErrorTracking do
       end
     end
 
+    context 'when authenticated as developer' do
+      before do
+        project.add_developer(user)
+      end
+
+      it 'returns 403' do
+        make_request
+
+        expect(response).to have_gitlab_http_status(:forbidden)
+      end
+
+      it 'returns 403 for update request' do
+        make_patch_request(true)
+
+        expect(response).to have_gitlab_http_status(:forbidden)
+      end
+    end
+
     context 'when authenticated as non-member' do
       it 'returns 404' do
         make_request

spec/services/projects/operations/update_service_spec.rb

@@ -169,6 +169,13 @@ describe Projects::Operations::UpdateService do
               .from(false)
               .to(true)
           end
+
+          it 'only updates enabled attribute' do
+            result
+
+            expect(project.error_tracking_setting.previous_changes.keys)
+              .to contain_exactly('enabled')
+          end
         end
 
         context 'without setting' do