Visit https://zoom.us/test and click Join to familiarize yourself with some of Zoom’s basic features. 
You will be the only participant in a test meeting.

Please note that not all features are available in a test meeting. For example, screen sharing is disabled.

A screenshot of  https://zoom.us/test

You may see a pop-up asking whether you want to open the Zoom meeting. Click Open Zoom Meetings to continue. 

A screenshot pop-up that may appear when joining a Zoom test meeting.

If the pop-up does not appear (or you clicked Cancel) and the test meeting does not open automatically, click Join from Zoom Workplace app. The pop-up should appear. 

A screenshot of  https://zoom.us/test after Join has been clicked.