Redirect to settings page on invalid update

app/controllers/projects/settings/ci_cd_controller.rb

@@ -19,7 +19,7 @@ module Projects
 
             redirect_to project_settings_ci_cd_path(@project)
           else
-            render 'show'
+            redirect_to project_settings_ci_cd_path(@project), alert: result[:message]
           end
         end
       end

spec/controllers/projects/settings/ci_cd_controller_spec.rb

@@ -191,6 +191,15 @@ describe Projects::Settings::CiCdController do
           expect(project.build_timeout).to eq(5400)
         end
       end
+
+      context 'when build_timeout_human_readable is invalid' do
+        let(:params) { { build_timeout_human_readable: '5m' } }
+
+        it 'set specified timeout' do
+          expect(subject).to set_flash[:alert]
+          expect(response).to redirect_to(namespace_project_settings_ci_cd_path)
+        end
+      end
     end
   end
 end