require("import")	-- the import fn
import("extend_template")	-- import lib into global
et=extend_template--alias

-- catching undefined variables
local env = _ENV -- Lua 5.2
if not env then env = getfenv () end -- Lua 5.1
setmetatable(env, {__index=function (t,i) error("undefined global variable `"..i.."'",2) end})

foo1 = et.Foo_0()
assert(foo1:test1(5) == 5)
assert(foo1:test2(7) == 7)