Lua library for dice games

dice.lua

Die = {
	roll = function(self)
		self.value = math.random(self.sides)
	end
}
Die["__index"] = Die

function D(sides, value)
	local die = {sides = sides, value = value}
	setmetatable(die, Die)
	return die
end

dice_test.lua

require("dice")

test("D should make a die",
	 function()
		local d = D(6)
		assert(d ~= nil)
	 end)

test("D should set the sides for the die",
	function()
		local d = D(6)
		assert(d.sides == 6)
	end)

test("D should set the value if you pass two args",
	function()
		local d = D(6, 3)
		assert(d.value == 3)
	end)

test("D:roll should randomize the value",
	function()
		local d = D(6, 10) -- Use an invalid value so we can see it change
		d:roll()
		assert(d.value >= 1 and d.value <= 6)
	end)