minetest/games/devtest/mods/basenodes/textures/info.txt

The dirt_with_grass folder is for testing loading textures from subfolders.
If it works correctly, the default_grass_side.png file in the folder is used but
default_grass.png is not overwritten by the file in the folder.

default_dirt.png should be overwritten by the default_dirt.png in the unittests
mod which depends on basenodes.