working version

init.lua

@@ -0,0 +1,47 @@
+
+fakelib = {}
+
+local function check(n, v, a, b)
+	local t = type(v)
+	if t == a or t == b then
+		return v
+	end
+	local info = debug.getinfo(2, "n")
+	local f = info.name or "?"
+	if info.namewhat ~= "method" then
+		-- Offset argument number when called using '.' instead of ':'
+		n = n + 1
+	end
+	error(string.format("bad argument #%i to '%s' (%s expected, got %s)", n, f, a, t), 3)
+end
+
+local function secure_table(t, index, id)
+	setmetatable(t, {
+		__index = index,
+		__newindex = {},
+		__metatable = id,
+	})
+	return t
+end
+
+local path = minetest.get_modpath("fakelib")
+
+for _,file in pairs({"metadata", "inventory", "player"}) do
+	loadfile(path.."/"..file..".lua")(check, secure_table)
+end
+
+if minetest.is_singleplayer() then
+	minetest.register_chatcommand("fakelib_test", {
+		description = "Test fakelib's API.",
+		params = "[<run error tests>]",
+		func = function(_, param)
+			local start_time = minetest.get_us_time()
+			local success = loadfile(path.."/tests.lua")(param == "true")
+			local end_time = minetest.get_us_time()
+			if success then
+				return true, string.format("Testing completed in %i us", end_time - start_time)
+			end
+			return true, "Testing failed. See console for errors."
+		end,
+	})
+end