===========================
step 1
lua ProjectDIR/src/lmod.in.lua shell --regression_testing --version
===========================
Modules based on Lua: Version 8.6.9  2022-02-02 11:25 -04:00
    https://lmod.readthedocs.io
===========================
step 2
lua ProjectDIR/src/lmod.in.lua shell --regression_testing load a
===========================
Lmod Warning: MODULEPATH is undefined.
Lmod has detected the following error: The following module(s) are unknown: "a"
Please check the spelling or version number. Also try "module spider ..."
It is also possible your cache file is out-of-date; it may help to try:
  $ module --ignore_cache load "a"
Also make sure that all modulefiles written in TCL start with the string #%Module
