diff --git a/.forgejo/workflows/test.yml b/.forgejo/workflows/test.yml
new file mode 100644
index 000000000..d358979c9
--- /dev/null
+++ b/.forgejo/workflows/test.yml
@@ -0,0 +1,9 @@
+on: [push]
+jobs:
+  test:
+    runs-on: docker
+    container:
+      image: 127.0.0.1:5000/voxelibre-test:latest
+    steps:
+      - run: cd /VoxeLibre && git pull && git checkout ${{ github.sha }}
+      - run: cd /VoxeLibre && sh test.sh
diff --git a/test.sh b/test.sh
new file mode 100755
index 000000000..2fd41548c
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -ex
+which luarocks && eval $(luarocks path)
+which luarocks-5.3 && eval $(luarocks-5.3 path)
+
+sh tests/luacheck/test.sh || true
+
+# Run unit tests
+find ./ -name 'unit-test.lua' | while read TEST; do
+	(
+		cd $(dirname $TEST)
+		busted unit-test.lua
+	)
+done
diff --git a/tests/docker/Dockerfile b/tests/docker/Dockerfile
new file mode 100644
index 000000000..45d45ccba
--- /dev/null
+++ b/tests/docker/Dockerfile
@@ -0,0 +1,19 @@
+FROM alpine
+
+RUN apk add --no-cache --virtual=build-dependencies build-base lua5.3-dev luajit-dev && \
+    apk add --no-cache luajit luarocks5.3 git && \
+    luarocks-5.3 install busted && \
+    luarocks-5.3 install luacov && \
+    luarocks-5.3 install luacheck && \
+    luarocks-5.3 install luaposix && \
+    git clone https://github.com/AlberTajuelo/bitop-lua.git && \
+    cd bitop-lua && \
+    sed -i 's/"lua >= 5.1, < 5.3"/"lua >= 5.1"/' bitop-lua-1.0-0.rockspec && \
+    luarocks-5.3 make && \
+    apk del --purge build-dependencies
+ENTRYPOINT ["/bin/sh"]
+
+RUN git config --global http.postBuffer 52428800 && \
+    git clone REPO && \
+    apk add minetest x11vnc xdotool
+
diff --git a/tests/docker/build.sh b/tests/docker/build.sh
new file mode 100755
index 000000000..195ecb51b
--- /dev/null
+++ b/tests/docker/build.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+echo "Enter repo: "
+read REPO
+
+sed -i "s#REPO#$REPO#" Dockerfile
+docker build . -t 127.0.0.1:5000/voxelibre-test:latest
+git restore Dockerfile
+
diff --git a/tests/lib/README.md b/tests/lib/README.md
new file mode 100644
index 000000000..f6961e0f9
--- /dev/null
+++ b/tests/lib/README.md
@@ -0,0 +1 @@
+`misc_helpers.lua` was copied from [Luanti 5.10.0](https://github.com/minetest/minetest/blob/568f7a8e8fb457c7b7bcfd3211c7f3f0481ed2e7/builtin/common/misc_helpers.lua), available under the GNU Lesser Public License (see https://github.com/minetest/minetest/blob/568f7a8e8fb457c7b7bcfd3211c7f3f0481ed2e7/LICENSE.txt)
diff --git a/tests/lib/misc_helpers.lua b/tests/lib/misc_helpers.lua
new file mode 100644
index 000000000..ce4179f54
--- /dev/null
+++ b/tests/lib/misc_helpers.lua
@@ -0,0 +1,772 @@
+--------------------------------------------------------------------------------
+-- Localize functions to avoid table lookups (better performance).
+local string_sub, string_find = string.sub, string.find
+local math = math
+
+--------------------------------------------------------------------------------
+local function basic_dump(o)
+	local tp = type(o)
+	if tp == "number" then
+		return tostring(o)
+	elseif tp == "string" then
+		return string.format("%q", o)
+	elseif tp == "boolean" then
+		return tostring(o)
+	elseif tp == "nil" then
+		return "nil"
+	-- Uncomment for full function dumping support.
+	-- Not currently enabled because bytecode isn't very human-readable and
+	-- dump's output is intended for humans.
+	--elseif tp == "function" then
+	--	return string.format("loadstring(%q)", string.dump(o))
+	elseif tp == "userdata" then
+		return tostring(o)
+	else
+		return string.format("<%s>", tp)
+	end
+end
+
+local keywords = {
+	["and"] = true,
+	["break"] = true,
+	["do"] = true,
+	["else"] = true,
+	["elseif"] = true,
+	["end"] = true,
+	["false"] = true,
+	["for"] = true,
+	["function"] = true,
+	["goto"] = true,  -- Lua 5.2
+	["if"] = true,
+	["in"] = true,
+	["local"] = true,
+	["nil"] = true,
+	["not"] = true,
+	["or"] = true,
+	["repeat"] = true,
+	["return"] = true,
+	["then"] = true,
+	["true"] = true,
+	["until"] = true,
+	["while"] = true,
+}
+local function is_valid_identifier(str)
+	if not str:find("^[a-zA-Z_][a-zA-Z0-9_]*$") or keywords[str] then
+		return false
+	end
+	return true
+end
+
+--------------------------------------------------------------------------------
+-- Dumps values in a line-per-value format.
+-- For example, {test = {"Testing..."}} becomes:
+--   _["test"] = {}
+--   _["test"][1] = "Testing..."
+-- This handles tables as keys and circular references properly.
+-- It also handles multiple references well, writing the table only once.
+-- The dumped argument is internal-only.
+
+function dump2(o, name, dumped)
+	name = name or "_"
+	-- "dumped" is used to keep track of serialized tables to handle
+	-- multiple references and circular tables properly.
+	-- It only contains tables as keys.  The value is the name that
+	-- the table has in the dump, eg:
+	-- {x = {"y"}} -> dumped[{"y"}] = '_["x"]'
+	dumped = dumped or {}
+	if type(o) ~= "table" then
+		return string.format("%s = %s\n", name, basic_dump(o))
+	end
+	if dumped[o] then
+		return string.format("%s = %s\n", name, dumped[o])
+	end
+	dumped[o] = name
+	-- This contains a list of strings to be concatenated later (because
+	-- Lua is slow at individual concatenation).
+	local t = {}
+	for k, v in pairs(o) do
+		local keyStr
+		if type(k) == "table" then
+			if dumped[k] then
+				keyStr = dumped[k]
+			else
+				-- Key tables don't have a name, so use one of
+				-- the form _G["table: 0xFFFFFFF"]
+				keyStr = string.format("_G[%q]", tostring(k))
+				-- Dump key table
+				t[#t + 1] = dump2(k, keyStr, dumped)
+			end
+		else
+			keyStr = basic_dump(k)
+		end
+		local vname = string.format("%s[%s]", name, keyStr)
+		t[#t + 1] = dump2(v, vname, dumped)
+	end
+	return string.format("%s = {}\n%s", name, table.concat(t))
+end
+
+--------------------------------------------------------------------------------
+-- This dumps values in a one-statement format.
+-- For example, {test = {"Testing..."}} becomes:
+-- [[{
+-- 	test = {
+-- 		"Testing..."
+-- 	}
+-- }]]
+-- This supports tables as keys, but not circular references.
+-- It performs poorly with multiple references as it writes out the full
+-- table each time.
+-- The indent field specifies a indentation string, it defaults to a tab.
+-- Use the empty string to disable indentation.
+-- The dumped and level arguments are internal-only.
+
+function dump(o, indent, nested, level)
+	local t = type(o)
+	if not level and t == "userdata" then
+		-- when userdata (e.g. player) is passed directly, print its metatable:
+		return "userdata metatable: " .. dump(getmetatable(o))
+	end
+	if t ~= "table" then
+		return basic_dump(o)
+	end
+
+	-- Contains table -> true/nil of currently nested tables
+	nested = nested or {}
+	if nested[o] then
+		return "<circular reference>"
+	end
+	nested[o] = true
+	indent = indent or "\t"
+	level = level or 1
+
+	local ret = {}
+	local dumped_indexes = {}
+	for i, v in ipairs(o) do
+		ret[#ret + 1] = dump(v, indent, nested, level + 1)
+		dumped_indexes[i] = true
+	end
+	for k, v in pairs(o) do
+		if not dumped_indexes[k] then
+			if type(k) ~= "string" or not is_valid_identifier(k) then
+				k = "["..dump(k, indent, nested, level + 1).."]"
+			end
+			v = dump(v, indent, nested, level + 1)
+			ret[#ret + 1] = k.." = "..v
+		end
+	end
+	nested[o] = nil
+	if indent ~= "" then
+		local indent_str = "\n"..string.rep(indent, level)
+		local end_indent_str = "\n"..string.rep(indent, level - 1)
+		return string.format("{%s%s%s}",
+				indent_str,
+				table.concat(ret, ","..indent_str),
+				end_indent_str)
+	end
+	return "{"..table.concat(ret, ", ").."}"
+end
+
+--------------------------------------------------------------------------------
+function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
+	delim = delim or ","
+	if delim == "" then
+		error("string.split separator is empty", 2)
+	end
+	max_splits = max_splits or -2
+	local items = {}
+	local pos, len = 1, #str
+	local plain = not sep_is_pattern
+	max_splits = max_splits + 1
+	repeat
+		local np, npe = string_find(str, delim, pos, plain)
+		np, npe = (np or (len+1)), (npe or (len+1))
+		if (not np) or (max_splits == 1) then
+			np = len + 1
+			npe = np
+		end
+		local s = string_sub(str, pos, np - 1)
+		if include_empty or (s ~= "") then
+			max_splits = max_splits - 1
+			items[#items + 1] = s
+		end
+		pos = npe + 1
+	until (max_splits == 0) or (pos > (len + 1))
+	return items
+end
+
+--------------------------------------------------------------------------------
+function table.indexof(list, val)
+	for i, v in ipairs(list) do
+		if v == val then
+			return i
+		end
+	end
+	return -1
+end
+
+--------------------------------------------------------------------------------
+function table.keyof(tb, val)
+	for k, v in pairs(tb) do
+		if v == val then
+			return k
+		end
+	end
+	return nil
+end
+
+--------------------------------------------------------------------------------
+function string:trim()
+	return self:match("^%s*(.-)%s*$")
+end
+
+local formspec_escapes = {
+	["\\"] = "\\\\",
+	["["] = "\\[",
+	["]"] = "\\]",
+	[";"] = "\\;",
+	[","] = "\\,",
+	["$"] = "\\$",
+}
+function core.formspec_escape(text)
+	-- Use explicit character set instead of dot here because it doubles the performance
+	return text and string.gsub(text, "[\\%[%];,$]", formspec_escapes)
+end
+
+
+local hypertext_escapes = {
+	["\\"] = "\\\\",
+	["<"] = "\\<",
+	[">"] = "\\>",
+}
+function core.hypertext_escape(text)
+	return text and text:gsub("[\\<>]", hypertext_escapes)
+end
+
+
+function core.wrap_text(text, max_length, as_table)
+	local result = {}
+	local line = {}
+	if #text <= max_length then
+		return as_table and {text} or text
+	end
+
+	local line_length = 0
+	for word in text:gmatch("%S+") do
+		if line_length > 0 and line_length + #word + 1 >= max_length then
+			-- word wouldn't fit on current line, move to next line
+			table.insert(result, table.concat(line, " "))
+			line = {word}
+			line_length = #word
+		else
+			table.insert(line, word)
+			line_length = line_length + 1 + #word
+		end
+	end
+
+	table.insert(result, table.concat(line, " "))
+	return as_table and result or table.concat(result, "\n")
+end
+
+--------------------------------------------------------------------------------
+
+if INIT == "game" then
+	local dirs1 = {9, 18, 7, 12}
+	local dirs2 = {20, 23, 22, 21}
+
+	function core.rotate_and_place(itemstack, placer, pointed_thing,
+			infinitestacks, orient_flags, prevent_after_place)
+		orient_flags = orient_flags or {}
+
+		local unode = core.get_node_or_nil(pointed_thing.under)
+		if not unode then
+			return
+		end
+		local undef = core.registered_nodes[unode.name]
+		local sneaking = placer and placer:get_player_control().sneak
+		if undef and undef.on_rightclick and not sneaking then
+			return undef.on_rightclick(pointed_thing.under, unode, placer,
+					itemstack, pointed_thing)
+		end
+		local fdir = placer and core.dir_to_facedir(placer:get_look_dir()) or 0
+
+		local above = pointed_thing.above
+		local under = pointed_thing.under
+		local iswall = (above.y == under.y)
+		local isceiling = not iswall and (above.y < under.y)
+
+		if undef and undef.buildable_to then
+			iswall = false
+		end
+
+		if orient_flags.force_floor then
+			iswall = false
+			isceiling = false
+		elseif orient_flags.force_ceiling then
+			iswall = false
+			isceiling = true
+		elseif orient_flags.force_wall then
+			iswall = true
+			isceiling = false
+		elseif orient_flags.invert_wall then
+			iswall = not iswall
+		end
+
+		local param2 = fdir
+		if iswall then
+			param2 = dirs1[fdir + 1]
+		elseif isceiling then
+			if orient_flags.force_facedir then
+				param2 = 20
+			else
+				param2 = dirs2[fdir + 1]
+			end
+		else -- place right side up
+			if orient_flags.force_facedir then
+				param2 = 0
+			end
+		end
+
+		local old_itemstack = ItemStack(itemstack)
+		local new_itemstack = core.item_place_node(itemstack, placer,
+				pointed_thing, param2, prevent_after_place)
+		return infinitestacks and old_itemstack or new_itemstack
+	end
+
+
+--------------------------------------------------------------------------------
+--Wrapper for rotate_and_place() to check for sneak and assume Creative mode
+--implies infinite stacks when performing a 6d rotation.
+--------------------------------------------------------------------------------
+	core.rotate_node = function(itemstack, placer, pointed_thing)
+		local name = placer and placer:get_player_name() or ""
+		local invert_wall = placer and placer:get_player_control().sneak or false
+		return core.rotate_and_place(itemstack, placer, pointed_thing,
+			core.is_creative_enabled(name),
+			{invert_wall = invert_wall}, true)
+	end
+end
+
+--------------------------------------------------------------------------------
+function core.explode_table_event(evt)
+	if evt ~= nil then
+		local parts = evt:split(":")
+		if #parts == 3 then
+			local t = parts[1]:trim()
+			local r = tonumber(parts[2]:trim())
+			local c = tonumber(parts[3]:trim())
+			if type(r) == "number" and type(c) == "number"
+					and t ~= "INV" then
+				return {type=t, row=r, column=c}
+			end
+		end
+	end
+	return {type="INV", row=0, column=0}
+end
+
+--------------------------------------------------------------------------------
+function core.explode_textlist_event(evt)
+	if evt ~= nil then
+		local parts = evt:split(":")
+		if #parts == 2 then
+			local t = parts[1]:trim()
+			local r = tonumber(parts[2]:trim())
+			if type(r) == "number" and t ~= "INV" then
+				return {type=t, index=r}
+			end
+		end
+	end
+	return {type="INV", index=0}
+end
+
+--------------------------------------------------------------------------------
+function core.explode_scrollbar_event(evt)
+	local retval = core.explode_textlist_event(evt)
+
+	retval.value = retval.index
+	retval.index = nil
+
+	return retval
+end
+
+--------------------------------------------------------------------------------
+function core.rgba(r, g, b, a)
+	return a and string.format("#%02X%02X%02X%02X", r, g, b, a) or
+			string.format("#%02X%02X%02X", r, g, b)
+end
+
+--------------------------------------------------------------------------------
+function core.pos_to_string(pos, decimal_places)
+	local x = pos.x
+	local y = pos.y
+	local z = pos.z
+	if decimal_places ~= nil then
+		x = string.format("%." .. decimal_places .. "f", x)
+		y = string.format("%." .. decimal_places .. "f", y)
+		z = string.format("%." .. decimal_places .. "f", z)
+	end
+	return "(" .. x .. "," .. y .. "," .. z .. ")"
+end
+
+--------------------------------------------------------------------------------
+function core.string_to_pos(value)
+	if value == nil then
+		return nil
+	end
+
+	value = value:match("^%((.-)%)$") or value -- strip parentheses
+
+	local x, y, z = value:trim():match("^([%d.-]+)[,%s]%s*([%d.-]+)[,%s]%s*([%d.-]+)$")
+	if x and y and z then
+		x = tonumber(x)
+		y = tonumber(y)
+		z = tonumber(z)
+		return vector.new(x, y, z)
+	end
+
+	return nil
+end
+
+
+--------------------------------------------------------------------------------
+
+do
+	local rel_num_cap = "(~?-?%d*%.?%d*)" -- may be overly permissive as this will be tonumber'ed anyways
+	local num_delim = "[,%s]%s*"
+	local pattern = "^" .. table.concat({rel_num_cap, rel_num_cap, rel_num_cap}, num_delim) .. "$"
+
+	local function parse_area_string(pos, relative_to)
+		local pp = {}
+		pp.x, pp.y, pp.z = pos:trim():match(pattern)
+		return core.parse_coordinates(pp.x, pp.y, pp.z, relative_to)
+	end
+
+	function core.string_to_area(value, relative_to)
+		local p1, p2 = value:match("^%((.-)%)%s*%((.-)%)$")
+		if not p1 then
+			return
+		end
+
+		p1 = parse_area_string(p1, relative_to)
+		p2 = parse_area_string(p2, relative_to)
+
+		if p1 == nil or p2 == nil then
+			return
+		end
+
+		return p1, p2
+	end
+end
+
+--------------------------------------------------------------------------------
+function table.copy(t, seen)
+	local n = {}
+	seen = seen or {}
+	seen[t] = n
+	for k, v in pairs(t) do
+		n[(type(k) == "table" and (seen[k] or table.copy(k, seen))) or k] =
+			(type(v) == "table" and (seen[v] or table.copy(v, seen))) or v
+	end
+	return n
+end
+
+
+function table.insert_all(t, other)
+	if table.move then -- LuaJIT
+		return table.move(other, 1, #other, #t + 1, t)
+	end
+	for i=1, #other do
+		t[#t + 1] = other[i]
+	end
+	return t
+end
+
+
+function table.key_value_swap(t)
+	local ti = {}
+	for k,v in pairs(t) do
+		ti[v] = k
+	end
+	return ti
+end
+
+
+function table.shuffle(t, from, to, random)
+	from = from or 1
+	to = to or #t
+	random = random or math.random
+	local n = to - from + 1
+	while n > 1 do
+		local r = from + n-1
+		local l = from + random(0, n-1)
+		t[l], t[r] = t[r], t[l]
+		n = n-1
+	end
+end
+
+
+--------------------------------------------------------------------------------
+-- mainmenu only functions
+--------------------------------------------------------------------------------
+if core.gettext then -- for client and mainmenu
+	function fgettext_ne(text, ...)
+		text = core.gettext(text)
+		local arg = {n=select('#', ...), ...}
+		if arg.n >= 1 then
+			-- Insert positional parameters ($1, $2, ...)
+			local result = ''
+			local pos = 1
+			while pos <= text:len() do
+				local newpos = text:find('[$]', pos)
+				if newpos == nil then
+					result = result .. text:sub(pos)
+					pos = text:len() + 1
+				else
+					local paramindex =
+						tonumber(text:sub(newpos+1, newpos+1))
+					result = result .. text:sub(pos, newpos-1)
+						.. tostring(arg[paramindex])
+					pos = newpos + 2
+				end
+			end
+			text = result
+		end
+		return text
+	end
+
+	function fgettext(text, ...)
+		return core.formspec_escape(fgettext_ne(text, ...))
+	end
+end
+
+local ESCAPE_CHAR = string.char(0x1b)
+
+function core.get_color_escape_sequence(color)
+	return ESCAPE_CHAR .. "(c@" .. color .. ")"
+end
+
+function core.get_background_escape_sequence(color)
+	return ESCAPE_CHAR .. "(b@" .. color .. ")"
+end
+
+function core.colorize(color, message)
+	local lines = tostring(message):split("\n", true)
+	local color_code = core.get_color_escape_sequence(color)
+
+	for i, line in ipairs(lines) do
+		lines[i] = color_code .. line
+	end
+
+	return table.concat(lines, "\n") .. core.get_color_escape_sequence("#ffffff")
+end
+
+
+function core.strip_foreground_colors(str)
+	return (str:gsub(ESCAPE_CHAR .. "%(c@[^)]+%)", ""))
+end
+
+function core.strip_background_colors(str)
+	return (str:gsub(ESCAPE_CHAR .. "%(b@[^)]+%)", ""))
+end
+
+function core.strip_colors(str)
+	return (str:gsub(ESCAPE_CHAR .. "%([bc]@[^)]+%)", ""))
+end
+
+local function translate(textdomain, str, num, ...)
+	local start_seq
+	if textdomain == "" and num == "" then
+		start_seq = ESCAPE_CHAR .. "T"
+	elseif num == "" then
+		start_seq = ESCAPE_CHAR .. "(T@" .. textdomain .. ")"
+	else
+		start_seq = ESCAPE_CHAR .. "(T@" .. textdomain .. "@" .. num .. ")"
+	end
+	local arg = {n=select('#', ...), ...}
+	local end_seq = ESCAPE_CHAR .. "E"
+	local arg_index = 1
+	local translated = str:gsub("@(.)", function(matched)
+		local c = string.byte(matched)
+		if string.byte("1") <= c and c <= string.byte("9") then
+			local a = c - string.byte("0")
+			if a ~= arg_index then
+				error("Escape sequences in string given to core.translate " ..
+					"are not in the correct order: got @" .. matched ..
+					"but expected @" .. tostring(arg_index))
+			end
+			if a > arg.n then
+				error("Not enough arguments provided to core.translate")
+			end
+			arg_index = arg_index + 1
+			return ESCAPE_CHAR .. "F" .. arg[a] .. ESCAPE_CHAR .. "E"
+		elseif matched == "n" then
+			return "\n"
+		else
+			return matched
+		end
+	end)
+	if arg_index < arg.n + 1 then
+		error("Too many arguments provided to core.translate")
+	end
+	return start_seq .. translated .. end_seq
+end
+
+function core.translate(textdomain, str, ...)
+	return translate(textdomain, str, "", ...)
+end
+
+function core.translate_n(textdomain, str, str_plural, n, ...)
+	assert (type(n) == "number")
+	assert (n >= 0)
+	assert (math.floor(n) == n)
+
+	-- Truncate n if too large
+	local max = 1000000
+	if n >= 2 * max then
+		n = n % max + max
+	end
+	if n == 1 then
+		return translate(textdomain, str, "1", ...)
+	else
+		return translate(textdomain, str_plural, tostring(n), ...)
+	end
+end
+
+function core.get_translator(textdomain)
+	return
+		(function(str, ...) return core.translate(textdomain or "", str, ...) end),
+		(function(str, str_plural, n, ...) return core.translate_n(textdomain or "", str, str_plural, n, ...) end)
+end
+
+--------------------------------------------------------------------------------
+-- Returns the exact coordinate of a pointed surface
+--------------------------------------------------------------------------------
+function core.pointed_thing_to_face_pos(placer, pointed_thing)
+	-- Avoid crash in some situations when player is inside a node, causing
+	-- 'above' to equal 'under'.
+	if vector.equals(pointed_thing.above, pointed_thing.under) then
+		return pointed_thing.under
+	end
+
+	local eye_height = placer:get_properties().eye_height
+	local eye_offset_first = placer:get_eye_offset()
+	local node_pos = pointed_thing.under
+	local camera_pos = placer:get_pos()
+	local pos_off = vector.multiply(
+			vector.subtract(pointed_thing.above, node_pos), 0.5)
+	local look_dir = placer:get_look_dir()
+	local offset, nc
+	local oc = {}
+
+	for c, v in pairs(pos_off) do
+		if nc or v == 0 then
+			oc[#oc + 1] = c
+		else
+			offset = v
+			nc = c
+		end
+	end
+
+	local fine_pos = {[nc] = node_pos[nc] + offset}
+	camera_pos.y = camera_pos.y + eye_height + eye_offset_first.y / 10
+	local f = (node_pos[nc] + offset - camera_pos[nc]) / look_dir[nc]
+
+	for i = 1, #oc do
+		fine_pos[oc[i]] = camera_pos[oc[i]] + look_dir[oc[i]] * f
+	end
+	return fine_pos
+end
+
+function core.string_to_privs(str, delim)
+	assert(type(str) == "string")
+	delim = delim or ','
+	local privs = {}
+	for _, priv in pairs(string.split(str, delim)) do
+		privs[priv:trim()] = true
+	end
+	return privs
+end
+
+function core.privs_to_string(privs, delim)
+	assert(type(privs) == "table")
+	delim = delim or ','
+	local list = {}
+	for priv, bool in pairs(privs) do
+		if bool then
+			list[#list + 1] = priv
+		end
+	end
+	table.sort(list)
+	return table.concat(list, delim)
+end
+
+function core.is_nan(number)
+	return number ~= number
+end
+
+--[[ Helper function for parsing an optionally relative number
+of a chat command parameter, using the chat command tilde notation.
+
+Parameters:
+* arg: String snippet containing the number; possible values:
+    * "<number>": return as number
+    * "~<number>": return relative_to + <number>
+    * "~": return relative_to
+    * Anything else will return `nil`
+* relative_to: Number to which the `arg` number might be relative to
+
+Returns:
+A number or `nil`, depending on `arg.
+
+Examples:
+* `core.parse_relative_number("5", 10)` returns 5
+* `core.parse_relative_number("~5", 10)` returns 15
+* `core.parse_relative_number("~", 10)` returns 10
+]]
+function core.parse_relative_number(arg, relative_to)
+	if not arg then
+		return nil
+	elseif arg == "~" then
+		return relative_to
+	elseif string.sub(arg, 1, 1) == "~" then
+		local number = tonumber(string.sub(arg, 2))
+		if not number then
+			return nil
+		end
+		if core.is_nan(number) or number == math.huge or number == -math.huge then
+			return nil
+		end
+		return relative_to + number
+	else
+		local number = tonumber(arg)
+		if core.is_nan(number) or number == math.huge or number == -math.huge then
+			return nil
+		end
+		return number
+	end
+end
+
+--[[ Helper function to parse coordinates that might be relative
+to another position; supports chat command tilde notation.
+Intended to be used in chat command parameter parsing.
+
+Parameters:
+* x, y, z: Parsed x, y, and z coordinates as strings
+* relative_to: Position to which to compare the position
+
+Syntax of x, y and z:
+* "<number>": return as number
+* "~<number>": return <number> + player position on this axis
+* "~": return player position on this axis
+
+Returns: a vector or nil for invalid input or if player does not exist
+]]
+function core.parse_coordinates(x, y, z, relative_to)
+	if not relative_to then
+		x, y, z = tonumber(x), tonumber(y), tonumber(z)
+		return x and y and z and { x = x, y = y, z = z }
+	end
+	local rx = core.parse_relative_number(x, relative_to.x)
+	local ry = core.parse_relative_number(y, relative_to.y)
+	local rz = core.parse_relative_number(z, relative_to.z)
+	return rx and ry and rz and { x = rx, y = ry, z = rz }
+end
diff --git a/tests/luacheck/test.lua b/tests/luacheck/test.lua
new file mode 100755
index 000000000..188c44d7a
--- /dev/null
+++ b/tests/luacheck/test.lua
@@ -0,0 +1,147 @@
+#!/usr/bin/lua
+
+local luacheck = "luacheck"
+
+core = {}
+dofile("tests/lib/misc_helpers.lua")
+
+local WHITESPACE = {
+	[" "] = true,
+	["\t"] = true,
+	["\r"] = true,
+	["\n"] = true,
+}
+function string.strip(str)
+	local start = 0
+	local stop
+	for i = 1,#str do
+		if not WHITESPACE[str:sub(i,i)] then
+			start = i
+			break
+		end
+	end
+	for i = 1,#str do
+		local p = #str - i + 1
+		if not WHITESPACE[str:sub(p,p)] then
+			stop = #str - i + 1
+			break
+		end
+	end
+
+	return str:sub(start, stop)
+end
+
+function read_mod_configuration(file)
+	local parts = file:split("/")
+	parts[#parts] = nil
+
+	local conf = {
+		file = file,
+		dir = table.concat(parts,"/").."/",
+	}
+
+	local f = io.open(file)
+	for line in f:lines() do
+		local parts = string.split(line,"=")
+		if parts and #parts >= 2 then
+			local key = parts[1]:strip()
+			local value = parts[2]:strip()
+			conf[key] = value
+		end
+	end
+	f:close()
+	return conf
+end
+
+function read_mod_data()
+	local mods = {}
+	local mod_names = {}
+
+	while true do
+		local line = io.read()
+		if not line or line == "EOF" then break end
+
+		local mod_conf = read_mod_configuration(line)
+		local name = mod_conf.name
+		if name then
+			table.insert(mod_names, name)
+			mods[name] = mod_conf
+		else
+			print("echo 'Warning! "..line.." doesn't declare module name'")
+		end
+	end
+
+	return mods,mod_names
+end
+
+function get_deps_for_mod(mod, mods)
+	local function add_deps_for_mod(mod, mods, deps, seen)
+		if not mods[mod] then return end
+
+		local dep_list = mods[mod].depends
+		if dep_list then
+			local depends = dep_list:split(",")
+			for i = 1,#depends do
+				local depend = depends[i]:strip()
+				if not seen[depend] then
+					seen[depend] = true
+					table.insert(deps, depend)
+					add_deps_for_mod(depend, mods, deps, seen)
+				end
+			end
+		end
+
+		local dep_list = mods[mod].optional_depends
+		if dep_list then
+			local depends = dep_list:split(",")
+			for i = 1,#depends do
+				local depend = depends[i]:strip()
+				if not seen[depend] then
+					seen[depend] = true
+					table.insert(deps, depend)
+					add_deps_for_mod(depend, mods, deps, seen)
+				end
+			end
+		end
+
+		local dep_list = mods[mod].luacheck_globals
+		if dep_list then
+			local globals = dep_list:split(",")
+			for i = 1,#globals do
+				local global = globals[i]:strip()
+				if not seen["global: "..global] then
+					seen["global: "..global] = true
+					table.insert(deps, global)
+				end
+			end
+		end
+	end
+	local deps = {mod}
+	local seen = {[mod] = true}
+	add_deps_for_mod(mod, mods, deps, seen)
+	return deps
+end
+
+local mods,mod_names = read_mod_data()
+for i = 1,#mod_names do
+	local mod = mod_names[i]
+	local config = mods[mod]
+
+	local deps = get_deps_for_mod(mod, mods)
+
+	local cmd_options = " --no-color"
+	for i = 1,#deps do
+		cmd_options = cmd_options .. " --globals "..deps[i]
+	end
+
+	local filename = ""
+	print("echo Checking "..config.name.." located at "..config.dir)
+	print("(")
+	print("\tcd "..config.dir)
+	print("\tfor FILE in *.lua; do")
+	print("\t\techo "..luacheck.." $FILE"..cmd_options)
+	print("\t\t"..luacheck.." $FILE"..cmd_options)
+	print("\tdone")
+	print(")")
+end
+
diff --git a/tests/luacheck/test.sh b/tests/luacheck/test.sh
new file mode 100755
index 000000000..9cd6dd3cf
--- /dev/null
+++ b/tests/luacheck/test.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+LUACHECK=$HOME/.luarocks/bin/luacheck
+
+(
+	find ./ -name mod.conf
+	echo EOF
+) | lua5.3 tests/luacheck/test.lua | sh
+