@danielkalen/simplybind/test/specs/stage-1-methods/pollEvery-stopPolling.coffee

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

suite ".pollEvery() + .stopPolling()", ()->
	suiteSetup(restartSandbox)
	setup ()-> @clock = sinon.useFakeTimers()
	teardown ()-> @clock.restore()
	
	test 'Will cause the value to be manually polled from the subject at a given interval', ()->
		lastValue = undefined
		arr = []

		binding = SimplyBind('length').of(arr).to((v)-> lastValue = v)
		expect(lastValue).to.equal 0
		arr.push 'some value'
		arr.push 'and another'
		expect(lastValue).to.equal 0
		
		arr = []
		binding = SimplyBind('length').of(arr).to((v)-> lastValue = v).pollEvery(5)
		expect(lastValue).to.equal 0
		
		@clock.tick(5)
		expect(lastValue).to.equal 0
		
		arr.push 'some value','and another','last value'
		expect(lastValue).to.equal 0

		@clock.tick(5)
		expect(lastValue).to.equal 3
		
		@clock.tick(5)
		expect(lastValue).to.equal 3
		arr.push 'some value'
		arr.push 'and another'
		binding.stopPolling()



	test 'Will invoke a function upon poll', ()->
		invokeCountA = 0
		invokeCountB = 0

		binding = SimplyBind(()-> ++invokeCountA).to(()-> ++invokeCountB).pollEvery(5)
		
		expect(invokeCountA).to.equal 1
		expect(invokeCountB).to.equal 1
		
		@clock.tick(4)
		expect(invokeCountA).to.equal 1
		expect(invokeCountB).to.equal 1
		
		@clock.tick(1)
		expect(invokeCountA).to.equal 2
		expect(invokeCountB).to.equal 2
		
		@clock.tick(5)
		expect(invokeCountA).to.equal 3
		expect(invokeCountB).to.equal 3
		
		@clock.tick(5)
		expect(invokeCountA).to.equal 4
		expect(invokeCountB).to.equal 4
		binding.stopPolling()



	test "Will re-create the interval poll if called .pollEvery() twice with different values", ()->
		invokeCount = 0
		objectA.prop = 200
		
		expect ()-> SimplyBind('prop', {'updateEvenIfSame':true}).of(objectA).to(()->invokeCount++).pollEvery(50).pollEvery(5)
			.not.to.throw()

		expect(invokeCount).to.equal 1
		@clock.tick(5)
		expect(invokeCount).to.equal 2
		@clock.tick(5)
		expect(invokeCount).to.equal 3
		@clock.tick(50)
		expect(invokeCount).to.equal 13
		restartSandbox()



	test "Will not throw errors when calling .stopPolling() on a binding with no pre-set interval", ()->
		expect ()-> SimplyBind('prop').of(objectA).to('prop').of(objectB).stopPolling()
			.not.to.throw()

		restartSandbox()



	test "Polling will be removed upon binding destruction", ()->
		invokeCount = 0
		
		binding = SimplyBind('prop', {updateEvenIfSame:true, updateOnBind:false}).of(objectA)
				.transformSelf ()-> invokeCount++
			.to(noop)
		binding.pollEvery(5)
		
		expect(invokeCount).to.equal 0
		@clock.tick(5)
		expect(invokeCount).to.equal 1
		@clock.tick(5)
		expect(invokeCount).to.equal 2

		SimplyBind.unBindAll(objectA)
			
		@clock.tick(15)
		expect(invokeCount).to.equal 2


	test "Invoking on an event binding will be ineffictive and will not create an interval timer", ()->
		objInterface = SimplyBind('prop').of(objectA).pollEvery(50)
		eventInterface = SimplyBind('event:someEvent').of(eventEmitterA).pollEvery(50)
		targetProperty = if objInterface.property? then 'pollInterval' else 'PI'

		expect(typeof objInterface._[targetProperty]).to.equal if isBrowser then 'number' else 'object'
		expect(typeof eventInterface._[targetProperty]).to.equal 'undefined'
		
		objInterface.stopPolling()
		restartSandbox()