_sp_scriptVersion=latest to end of the URL for the page you wish to test.
If you wanted to test the latest released code on
https://www.sourcepoint.com you would utilize
Note: When using the
_sp_scriptVersion=latest querystring parameter, you may see the following error in the developer console.
Uncaught Error: overridden at messaging.js:1 at messaging.js:1 at HTMLScriptElement. (messaging.js:1)
This error can be ignored. It is generated by the process of replacing the existing code on the site with the latest version.