To be tested in both android and ios, new and old devices. Check there's a square (see the attached images) when scanning QR. Check the flash light button work properly. It turns on and off the camera. Check the switch camera button work properly. It toggles between front and back camera. If there's a phone or device with only one camera, check it does not show the button. It should be difficult to test and it's no big deal. Deny camera permissions and try to scan a code. It should show a confirmation alert to open the Operating system settings to change the permission. When you are back to the app the QR modal is closed and you should click the button again.