@danielkalen/simplybind/test/specs/data-binding/throttling.coffee

Magically simple, framework-less one-way/two-way data binding for frontend/backend in ~5kb.

suite "Throttling", ()->
	suiteSetup(restartSandbox)
	test "Setting options.throttle for a binding will throttle the subscriber update frequency to once in a given timeframe", (done)->
		@slow(150)
		invokeCount = 0
		lastValue = null
		dispatcher = 'prop':1

		SimplyBind('prop', {throttle:15}).of(dispatcher)
			.to (v)-> lastValue=v; invokeCount++

		expect(invokeCount).to.equal(1)
		expect(lastValue).to.equal(1)

		dispatcher.prop = 2
		dispatcher.prop = 3
		dispatcher.prop = 4
		dispatcher.prop = 5
		expect(invokeCount).to.equal(1)
		expect(lastValue).to.equal(1)

		setTimeout ()->
			expect(invokeCount).to.equal(2)
			expect(lastValue).to.equal(5)
			done()
		, 25
	

	test "Throttled updates are set for each binding individually", (done)->
		@slow(150)
		invokeCount = {fastThrottle:0, slowThrottle:0, noThrottle:0}
		dispatcher = 'prop':1

		SimplyBind('prop', {throttle:10}).of(dispatcher).to ()-> invokeCount.fastThrottle++
		SimplyBind('prop', {throttle:35}).of(dispatcher).to ()-> invokeCount.slowThrottle++
		SimplyBind('prop').of(dispatcher).to ()-> invokeCount.noThrottle++

		expect(invokeCount.fastThrottle).to.equal(1)
		expect(invokeCount.slowThrottle).to.equal(1)
		expect(invokeCount.noThrottle).to.equal(1)

		dispatcher.prop = 2
		dispatcher.prop = 3
		dispatcher.prop = 4
		dispatcher.prop = 5

		expect(invokeCount.fastThrottle).to.equal(1)
		expect(invokeCount.slowThrottle).to.equal(1)
		expect(invokeCount.noThrottle).to.equal(5)

		setTimeout ()->
			expect(invokeCount.fastThrottle).to.equal(2)
			expect(invokeCount.slowThrottle).to.equal(1)
			expect(invokeCount.noThrottle).to.equal(5)
			setTimeout ()->
				expect(invokeCount.fastThrottle).to.equal(2)
				expect(invokeCount.slowThrottle).to.equal(2)
				expect(invokeCount.noThrottle).to.equal(5)
				done()
			, 35
		, 25
	

	test "Will remove existing throttle if passed a falsy value", ()->
		invokeCount = 0
		lastValue = null
		dispatcher = 'prop':1

		binding = SimplyBind('prop', throttle:15).of(dispatcher)
			.to (v)-> lastValue=v; invokeCount++

		dispatcher.prop = 2
		dispatcher.prop = 3
		dispatcher.prop = 4
		dispatcher.prop = 5
		expect(invokeCount).to.equal(1)
		expect(lastValue).to.equal(1)

		binding.setOption('throttle', 0)
		dispatcher.prop = 2
		dispatcher.prop = 3
		dispatcher.prop = 4
		dispatcher.prop = 5
		expect(invokeCount).to.equal(5)
		expect(lastValue).to.equal(5)