+
+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
+
+local function override_gettime(throttle)
+ local i = 0;
+ repeat
+ i = i + 1;
+ local name = debug.getupvalue(throttle.update, i);
+ if name then
+ debug.setupvalue(throttle.update, i, predictable_gettime);
+ return throttle;
+ end
+ until not name;
+end
+
+function create(create)
+ local a = override_gettime( 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
+