File

spec/util_throttle_spec.lua @ 13267:7ae000fc8c07 0.12

mod_muc_mam: Improve wording of enable setting Suggested by jstein in the chat This option label is used by XMPP clients to explain what the option does. a) The user should know where the data is archived. b) The user needs a statement that can be enabled/disabled by the variable. A question would have the wrong logic here.
author Kim Alvefur <zash@zash.se>
date Sun, 15 Oct 2023 14:43:11 +0200
parent 9993:02a41315d275
child 13399:f4415f76727b
line wrap: on
line source



-- Mock util.time
local now = 0; -- wibbly-wobbly... timey-wimey... stuff
local function later(n)
	now = now + n; -- time passes at a different rate
end
package.loaded["util.time"] = {
	now = function() return now; end
}


local throttle = require "util.throttle";

describe("util.throttle", function()
	describe("#create()", function()
		it("should be created with correct values", function()
			now = 5;
			local a = throttle.create(3, 10);
			assert.same(a, { balance = 3, max = 3, rate = 0.3, t = 5 });

			local a = throttle.create(3, 5);
			assert.same(a, { balance = 3, max = 3, rate = 0.6, t = 5 });

			local a = throttle.create(1, 1);
			assert.same(a, { balance = 1, max = 1, rate = 1, t = 5 });

			local a = throttle.create(10, 10);
			assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 });

			local a = throttle.create(10, 1);
			assert.same(a, { balance = 10, max = 10, rate = 10, t = 5 });
		end);
	end);

	describe("#update()", function()
		it("does nothing when no time has passed, even if balance is not full", function()
			now = 5;
			local a = throttle.create(10, 10);
			for i=1,5 do
				a:update();
				assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 });
			end
			a.balance = 0;
			for i=1,5 do
				a:update();
				assert.same(a, { balance = 0, max = 10, rate = 1, t = 5 });
			end
		end);
		it("updates only time when time passes but balance is full", function()
			now = 5;
			local a = throttle.create(10, 10);
			for i=1,5 do
				later(5);
				a:update();
				assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 + i*5 });
			end
		end);
		it("updates balance when balance has room to grow as time passes", function()
			now = 5;
			local a = throttle.create(10, 10);
			a.balance = 0;
			assert.same(a, { balance = 0, max = 10, rate = 1, t = 5 });

			later(1);
			a:update();
			assert.same(a, { balance = 1, max = 10, rate = 1, t = 6 });

			later(3);
			a:update();
			assert.same(a, { balance = 4, max = 10, rate = 1, t = 9 });

			later(10);
			a:update();
			assert.same(a, { balance = 10, max = 10, rate = 1, t = 19 });
		end);
		it("handles 10 x 0.1s updates the same as 1 x 1s update ", function()
			now = 5;
			local a = throttle.create(1, 1);

			a.balance = 0;
			later(1);
			a:update();
			assert.same(a, { balance = 1, max = 1, rate = 1, t = now });

			a.balance = 0;
			for i=1,10 do
				later(0.1);
				a:update();
			end
			assert(math.abs(a.balance - 1) < 0.0001); -- incremental updates cause rounding errors
		end);
	end);

	-- describe("po")

	describe("#poll()", function()
		it("should only allow successful polls until cost is hit", function()
			now = 5;

			local a = throttle.create(3, 10);
			assert.same(a, { balance = 3, max = 3, rate = 0.3, t = 5 });

			assert.is_true(a:poll(1));  -- 3 -> 2
			assert.same(a, { balance = 2, max = 3, rate = 0.3, t = 5 });

			assert.is_true(a:poll(2));  -- 2 -> 1
			assert.same(a, { balance = 0, max = 3, rate = 0.3, t = 5 });

			assert.is_false(a:poll(1)); -- MEEP, out of credits!
			assert.is_false(a:poll(1)); -- MEEP, out of credits!
			assert.same(a, { balance = 0, max = 3, rate = 0.3, t = 5 });
		end);

		it("should not allow polls more than the cost", function()
			now = 0;

			local a = throttle.create(10, 10);
			assert.same(a, { balance = 10, max = 10, rate = 1, t = 0 });

			assert.is_false(a:poll(11));
			assert.same(a, { balance = 10, max = 10, rate = 1, t = 0 });

			assert.is_true(a:poll(6));
			assert.same(a, { balance = 4, max = 10, rate = 1, t = 0 });

			assert.is_false(a:poll(5));
			assert.same(a, { balance = 4, max = 10, rate = 1, t = 0 });

			-- fractional
			assert.is_true(a:poll(3.5));
			assert.same(a, { balance = 0.5, max = 10, rate = 1, t = 0 });

			assert.is_true(a:poll(0.25));
			assert.same(a, { balance = 0.25, max = 10, rate = 1, t = 0 });

			assert.is_false(a:poll(0.3));
			assert.same(a, { balance = 0.25, max = 10, rate = 1, t = 0 });

			assert.is_true(a:poll(0.25));
			assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });

			assert.is_false(a:poll(0.1));
			assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });

			assert.is_true(a:poll(0));
			assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
		end);
	end);
end);