When making a change, copy the current modules to the sandbox pages, then edit the sandbox copies.

If wanted, use the purge link just above to update the following status report.

Use the following template to test the results (example {{convert/sandbox|123|lb|kg}}):

Testscases:

It is not necessary to save a module before viewing test results. For example, Module:Convert/sandbox could be edited. While still editing that page, paste

Module talk:Convert/sandbox/testcases

into the page title box under "Preview page with this template", then click "Show preview".