module.lua

-- Original code
tpz = {}
tpz.testMethod = function(a, b, c)
	print(a, b, c)
end

-- 'Module' helper
module = {}
module.override = function(t, name, func)

	local old = t[name]
	local thisenv = getfenv(old)

	local env = { super = old }
	setmetatable(env, { __index = thisenv })

	setfenv(func, env)
	t[name] = func
end

-- Module content
module.override(tpz, 'testMethod',
	function(a, b, c)

		super(a,b,c)
		print(a + 1, b + 1, c + 1)
	end)

module.override(tpz, 'testMethod',
	
	function(a,b,c)
		
		print "play it again, sam"
		
		super(a,b,c)	
	end)

-- Game runtime
tpz.testMethod(1, 2, 3)