@danielkalen/simplybind/test/specs/data-binding/group-misc.coffee

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

suite "Miscellenious", ()->
	test "Binding single prop to multiple ObjectProps' placeholders", ()->
		dispatcher = 'prop':'word'
		objectA.prop1 = objectB.prop1 = objectC.prop1 = 'some {{noun}} here'

		SimplyBind('prop').of(dispatcher)
			.to('multi:prop1.noun').of([objectA, objectB, objectC])

		expect(objectA.prop1).to.equal 'some word here'
		expect(objectB.prop1).to.equal 'some word here'
		expect(objectC.prop1).to.equal 'some word here'

		dispatcher.prop = 'letter'
		expect(objectA.prop1).to.equal 'some letter here'
		expect(objectB.prop1).to.equal 'some letter here'
		expect(objectC.prop1).to.equal 'some letter here'

		restartSandbox()
	


	test "Fetching the value of a multi binding should yield an array of all the values", ()->
		objectA.prop1 = 'A'
		objectB.prop1 = 'B'
		objectC.prop1 = 'C'

		binding = SimplyBind('multi:prop1').of([objectA, objectB, objectC])
		values = binding.value

		expect(objectA.prop1).to.equal 'A'
		expect(objectB.prop1).to.equal 'B'
		expect(objectC.prop1).to.equal 'C'
		expect(values).to.be.instanceOf Array
		expect(values[0]).to.equal 'A'
		expect(values[1]).to.equal 'B'
		expect(values[2]).to.equal 'C'

		restartSandbox()
	


	test "Fetching the value using the method of a multi binding w/ placeholders should yield an array containing the values of each binding", ()->
		dispatcher = 'prop':'word'
		objectA.prop1 = objectB.prop1 = objectC.prop1 = 'some {{noun}} here'

		SimplyBind('prop').of(dispatcher)
			.to('multi:prop1.noun').of([objectA, objectB, objectC])

		binding = SimplyBind('multi:prop1.noun').of([objectA, objectB, objectC])
		value = binding.value

		expect(objectA.prop1).to.equal 'some word here'
		expect(objectB.prop1).to.equal 'some word here'
		expect(objectC.prop1).to.equal 'some word here'
		expect(value.length).to.equal 3
		expect(value[0]).to.equal 'word'

		restartSandbox()



	test "Binding single prop to multiple ObjectProps with a self transform should be applied to all bindings", ()->
		dispatcher = 'prop':'value1'
		objectA.prop1 = objectB.prop1 = objectC.prop1 = null

		SimplyBind('prop').of(dispatcher)
			.to('multi:prop1').of([objectA, objectB, objectC])

		SimplyBind('multi:prop1').of([objectA, objectB, objectC])
			.transformSelf (value)-> value.toUpperCase()

		expect(objectA.prop1).to.equal 'VALUE1'
		expect(objectB.prop1).to.equal 'VALUE1'
		expect(objectC.prop1).to.equal 'VALUE1'

		dispatcher.prop = 'value2'
		expect(objectA.prop1).to.equal 'VALUE2'
		expect(objectB.prop1).to.equal 'VALUE2'
		expect(objectC.prop1).to.equal 'VALUE2'

		restartSandbox()



	test "throttling is supported", (done)->
		@slow(150)
		invokeCount = 0
		lastValue = null
		objectA.prop1 = objectB.prop1 = objectC.prop1 = 'same'

		SimplyBind('multi:prop1', {throttle:15, updateEvenIfSame:true}).of([objectA, objectB, objectC])
			.to (v)-> lastValue=v; invokeCount++

		expect(invokeCount).to.equal(3)
		expect(lastValue).to.equal 'same'

		objectA.prop1 = 'another1'
		objectA.prop1 = 'another2'
		objectA.prop1 = 'another3'
		objectA.prop1 = 'another4'
		expect(invokeCount).to.equal(3)
		expect(lastValue).to.equal('same')

		objectB.prop1 = 'another5'
		expect(lastValue).to.equal('same')
		expect(invokeCount).to.equal(3)

		objectC.prop1 = 'another6'
		expect(lastValue).to.equal('same')
		expect(invokeCount).to.equal(3)
		
		objectC.prop1 = 'another7'
		expect(invokeCount).to.equal(3)
		expect(lastValue).to.equal('same')

		setTimeout ()->
			expect(invokeCount).to.equal(6)
			expect(lastValue is 'another5' or lastValue is 'another7').to.be.true
			done()
			restartSandbox()
		, 50



	test "Using the 'multi:' descriptor on a empty DOM list should throw an error", ()->
		expect ()-> SimplyBind('multi:prop').of($('nonexistent'))
			.to.throw()
		
		expect ()-> SimplyBind('multi:prop').of(document.querySelectorAll('nonexistent'))
			.to.throw()

		expect ()-> SimplyBind('multi:prop').of([])
			.to.throw()

		restartSandbox()



	test "The 'multi:' descriptor can be used along with other descriptors", ()->
		emitCount = 0
		
		SimplyBind('multi:event:someEvent#0').of([eventEmitterA, eventEmitterB, eventEmitterC])
			.to ()-> emitCount++

		expect(emitCount).to.equal 0
		
		eventEmitterA.emit('someEvent')
		expect(emitCount).to.equal 1
		
		eventEmitterB.emit('someEvent')
		expect(emitCount).to.equal 2
		
		eventEmitterC.emit('someEvent')
		expect(emitCount).to.equal 3

		if isBrowser
			SimplyBind('prop').of(objectA)
				.to('multi:attr:someattr').of([regA, regB, regC])

			objectA.prop = 'anotherValue'

			expect(regA.getAttribute 'someattr').to.equal 'anotherValue'
			expect(regB.getAttribute 'someattr').to.equal 'anotherValue'
			expect(regC.getAttribute 'someattr').to.equal 'anotherValue'

		restartSandbox()