People need to know if the extension has been tested with a mediawiki version. I generally go from LTS version to LTS version and I skip the in between versions. So I would want to know if the extension I used with mediawiki 1.35 will work in mediawiki 1.39.x LTS.
Unit Test Master:
Unit Test File: myextension/Unit Test Table Newest MediaWiki Version: 1.39.x LTS Oldest MediaWiki Version: 1.35.x LTS
MediaWiki 1.39.x LTS Status: Tested / Not tested / Tested with issues / Broken MediaWiki 1.35.x LTS Status: Tested / Not tested / Tested with issues / Broken
I personally do not think that we need to do this for every single version. The LTS versions are enough. But my view on this might be due to the fact that I stick with LTS versions and I would expect extension developers to make sure that their extension works with LTS version before worrying about the in between versions.