@danielkalen/simplybind/test/specs/stage-1-methods/updateOn-removeUpdater.coffee

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

suite ".updateOn() + .removeUpdater()", ()->
	suiteSetup(restartSandbox)
	test "Will listen for changes on the desired target upon change will poll (and update if changed) the binding's value", ()->
		Object.defineProperty eventEmitterA, 'nonLiveProp', {value:'someValue', writable:true, configurable:false}
		binding = SimplyBind('nonLiveProp').of(eventEmitterA).to('prop1').of(objectA).updateOn('event:click').of(eventEmitterA)

		binding.set 'one'
		expect(objectA.prop1).to.equal 'one'

		eventEmitterA.nonLiveProp = 'two'
		expect(objectA.prop1).to.equal 'one'

		eventEmitterA.emit 'click'
		expect(objectA.prop1).to.equal 'two'

		binding.removeUpdater('event:click').of(eventEmitterA)
		eventEmitterA.nonLiveProp = 'three'
		expect(objectA.prop1).to.equal 'two'

		eventEmitterA.emit 'click'
		expect(objectA.prop1).to.equal 'two'
		restartSandbox()



	test "Will do nothing when trying to remove an updater that wasn't registered or when trying to add an updater that was already registered", ()->
		Object.defineProperty eventEmitterB, 'nonLiveProp', {value:'someValue', writable:true, configurable:false}
		binding = SimplyBind('nonLiveProp').of(eventEmitterB).to('prop1').of(objectA).updateOn('event:click').of(eventEmitterB)
		pubsMap = binding._.pubsMap or binding._.pM;
		Object.defineProperty(pubsMap, 'length', get:()->Object.keys(@).length)
		expect(pubsMap.length).to.equal 1
		
		binding = SimplyBind('nonLiveProp').of(eventEmitterB).to('prop1').of(objectA).updateOn('event:click').of(eventEmitterB)
		binding = SimplyBind('nonLiveProp').of(eventEmitterB).to('prop1').of(objectA).updateOn('event:change').of(eventEmitterB)
		expect(pubsMap.length).to.equal 2
		
		binding.removeUpdater('event:clicker').of(eventEmitterB)
		expect(pubsMap.length).to.equal 2
		
		binding.removeUpdater('event:click').of(eventEmitterB)
		expect(pubsMap.length).to.equal 1
		
		binding.removeUpdater('event:change').of(eventEmitterB)
		expect(pubsMap.length).to.equal 0

		restartSandbox()



	test "Multiple updaters can be registered", ()->
		invokeCount = 0
		
		SimplyBind('prop', updateEvenIfSame:true).of(objectA)
			.updateOn('prop').of(objectB)
			.updateOn('prop').of(objectC)
			.to ()-> invokeCount++

		expect(invokeCount).to.equal 1
		
		objectA.prop = !objectA.prop
		expect(invokeCount).to.equal 2
		
		objectB.prop = !objectB.prop
		expect(invokeCount).to.equal 3
		
		objectC.prop = !objectC.prop
		expect(invokeCount).to.equal 4

		restartSandbox()


	test "Can be thorttled", (done)->
		invokeCount = 0
		objectA.prop = true
		binding = SimplyBind('prop', updateEvenIfSame:true).of(objectA)
			.updateOn('prop', throttle:5).of(objectB)
			.updateOn('prop').of(objectC)
			.to ()-> invokeCount++

		expect(invokeCount).to.equal 1
		objectA.prop = !objectA.prop
		objectA.prop = !objectA.prop
		objectA.prop = !objectA.prop
		expect(invokeCount).to.equal 4
		
		objectB.prop = !objectB.prop
		expect(invokeCount).to.equal 5
		
		objectC.prop = !objectC.prop
		expect(invokeCount).to.equal 6
		
		objectC.prop = !objectC.prop
		objectC.prop = !objectC.prop
		objectC.prop = !objectC.prop
		expect(invokeCount).to.equal 9
		
		objectB.prop = !objectB.prop
		objectB.prop = !objectB.prop
		objectB.prop = !objectB.prop
		expect(invokeCount).to.equal 9

		setTimeout ()->
			expect(invokeCount).to.equal 10
			done()
		, 10