Thankyou Quinn for your response, I thought it would be easier to write a CLI than a full GUI to test a package. I did manage to write a CLI with a bundle structure and yes, there were many hoops to jump through. but it does work.

I have managed to wrap a "command line tool" into a .app package and to test my package localization. while this works it's obviously not the idle way to test a package localization. Just waiting to see if I get any more responses from someone who has actually tried to do this. Just to recap, there is nothing special here, just a command line tool with a Localization.xcstrings file that has one sentence both in English and fr-CA.

by console, I am referring to a command line tool. My intention was to use the command line tool to test a package I am working on, as the eventual target will be a window app, I may abandon my efforts to localize my command line tool. I am using Swift Testing to unit test the package. I was hoping to hear from someone who had actually done this already.