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. Script error: No such module "convert/sandbox/testcases".

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".