I noticed the new TEST command but it seems to require authentication.  My
current workflow includes a script to validate links across many accounts.
To do this I use

echo 0 | megatools.exe dl --choose-files %link% 2>tempfile
find "WARNING: Index 0 out of range"

If the warning is found, the link is valid, otherwise there is an issue
with the mega.nz link.

Thanks for the tool.

Rubber Ducky