I want to test my app for to hit a 500 Internal server and when it does I want to show my custom error page

On my angularjs app, I have defined custom error pages on nginx server like for 404 and 500 errors and I have changed the certain code accordingly I need to test whether it shows the 500 error custom page, How to test my app to hit 500 error and show my custom error page, Any tests to check the 500 error on angular js app??