Lua on each mapgen thread (#13092)

games/devtest/mods/unittests/inside_mapgen_env.lua

@@ -0,0 +1,32 @@
+core.log("info", "Hello World")
+
+local function do_tests()
+	assert(core == minetest)
+	-- stuff that should not be here
+	assert(not core.get_player_by_name)
+	assert(not core.object_refs)
+	-- stuff that should be here
+	assert(core.register_on_generated)
+	assert(core.get_node)
+	assert(core.spawn_tree)
+	assert(ItemStack)
+	local meta = ItemStack():get_meta()
+	assert(type(meta) == "userdata")
+	assert(type(meta.set_tool_capabilities) == "function")
+	assert(core.registered_items[""])
+	assert(core.save_gen_notify)
+	-- alias handling
+	assert(core.registered_items["unittests:steel_ingot_alias"].name ==
+		"unittests:steel_ingot")
+	-- fallback to item defaults
+	assert(core.registered_items["unittests:description_test"].on_place == true)
+end
+
+-- there's no (usable) communcation path between mapgen and the regular env
+-- so we just run the test unconditionally
+do_tests()
+
+core.register_on_generated(function(vm, pos1, pos2, blockseed)
+	local n = tonumber(core.get_mapgen_setting("chunksize")) * 16 - 1
+	assert(pos2:subtract(pos1) == vector.new(n, n, n))
+end)

games/devtest/mods/unittests/misc.lua

@@ -1,3 +1,6 @@
+core.register_mapgen_script(core.get_modpath(core.get_current_modname()) ..
+	DIR_DELIM .. "inside_mapgen_env.lua")
+
 local function test_pseudo_random()
 	-- We have comprehensive unit tests in C++, this is just to make sure the API code isn't messing up
 	local gen1 = PseudoRandom(13)
@@ -204,3 +207,30 @@ local function test_on_mapblocks_changed(cb, player, pos)
 	end
 end
 unittests.register("test_on_mapblocks_changed", test_on_mapblocks_changed, {map=true, async=true})
+
+local function test_gennotify_api()
+	local DECO_ID = 123
+	local UD_ID = "unittests:dummy"
+
+	-- the engine doesn't check if the id is actually valid, maybe it should
+	core.set_gen_notify({decoration=true}, {DECO_ID})
+
+	core.set_gen_notify({custom=true}, nil, {UD_ID})
+
+	local flags, deco, custom = core.get_gen_notify()
+	local function ff(flag)
+		return (" " .. flags .. " "):match("[ ,]" .. flag .. "[ ,]") ~= nil
+	end
+	assert(ff("decoration"), "'decoration' flag missing")
+	assert(ff("custom"), "'custom' flag missing")
+	assert(table.indexof(deco, DECO_ID) > 0)
+	assert(table.indexof(custom, UD_ID) > 0)
+
+	core.set_gen_notify({decoration=false, custom=false})
+
+	flags, deco, custom = core.get_gen_notify()
+	assert(not ff("decoration") and not ff("custom"))
+	assert(#deco == 0, "deco ids not empty")
+	assert(#custom == 0, "custom ids not empty")
+end
+unittests.register("test_gennotify_api", test_gennotify_api)