devtest: weird texture additions?

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

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

games/devtest/mods/testtools/light.lua

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+
+local S = minetest.get_translator("testtools")
+
+minetest.register_tool("testtools:lighttool", {
+	description = S("Light tool"),
+	inventory_image = "testtools_lighttool.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		local pos = pointed_thing.above
+		if pointed_thing.type ~= "node" or not pos then
+			return
+		end
+
+		local node = minetest.get_node(pos)
+		local time = minetest.get_timeofday()
+		local sunlight = minetest.get_natural_light(pos)
+		local artificial = minetest.get_artificial_light(node.param1)
+		local message = ("param1 0x%02x | time %.5f | sunlight %d | artificial %d")
+				:format(node.param1, time, sunlight, artificial)
+		minetest.chat_send_player(user:get_player_name(), message)
+	end
+})

games/devtest/mods/unittests/itemdescription.lua

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+local full_description = "Colorful Pickaxe\nThe best pick."
+minetest.register_tool("unittests:colorful_pick", {
+	description = full_description,
+	inventory_image = "basetools_mesepick.png",
+	tool_capabilities = {
+		full_punch_interval = 1.0,
+		max_drop_level=3,
+		groupcaps={
+			cracky={times={[1]=2.0, [2]=1.0, [3]=0.5}, uses=20, maxlevel=3},
+			crumbly={times={[1]=2.0, [2]=1.0, [3]=0.5}, uses=20, maxlevel=3},
+			snappy={times={[1]=2.0, [2]=1.0, [3]=0.5}, uses=20, maxlevel=3}
+		},
+		damage_groups = {fleshy=4},
+	},
+})
+
+minetest.register_chatcommand("item_description", {
+	param = "",
+	description = "Show the short and full description of the wielded item.",
+	func = function(name)
+		local player = minetest.get_player_by_name(name)
+		local item = player:get_wielded_item()
+		return true, string.format("short_description: %s\ndescription: %s",
+				item:get_short_description(), item:get_description())
+	end
+})
+
+function unittests.test_short_desc()
+	local stack = ItemStack("unittests:colorful_pick")
+	assert(stack:get_short_description() == "Colorful Pickaxe")
+	assert(stack:get_short_description() == minetest.registered_items["unittests:colorful_pick"].short_description)
+	assert(stack:get_description() == full_description)
+	assert(stack:get_description() == minetest.registered_items["unittests:colorful_pick"].description)
+
+	stack:get_meta():set_string("description", "Hello World")
+	assert(stack:get_short_description() == "Colorful Pickaxe")
+	assert(stack:get_description() == "Hello World")
+
+	stack:get_meta():set_string("short_description", "Foo Bar")
+	assert(stack:get_short_description() == "Foo Bar")
+	assert(stack:get_description() == "Hello World")
+
+	return true
+end