local now = 0; -- wibbly-wobbly... timey-wimey... stuff
local function predictable_gettime()
	return now;
end
local function later(n)
	now = now + n; -- time passes at a different rate
end

package.loaded["util.time"] = {
	now = predictable_gettime;
}

function create(create)
	local a = create(3, 10);

	assert_equal(a:poll(1), true);  -- 3 -> 2
	assert_equal(a:poll(1), true);  -- 2 -> 1
	assert_equal(a:poll(1), true);  -- 1 -> 0
	assert_equal(a:poll(1), false); -- MEEP, out of credits!
	later(1);                       -- ... what about
	assert_equal(a:poll(1), false); -- now? - Still no!
	later(9);                       -- Later that day
	assert_equal(a:poll(1), true);  -- Should be back at 3 credits ... 2
end