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

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

suite ".once", ()->
	suiteSetup(restartSandbox)
	suite "Allows to bind a publisher to a subscriber to be updated only once", ()->
		test "ObjectProp", ()->
			SimplyBind('prop').of(objectA)
				.once.to('prop').of(objectB)
				.and.to('prop').of(objectC)

			SimplyBind('interrupter', updateOnBind:false).of(objectA)
				.to('prop').of(objectB)

			objectA.interrupter = 'interrupterValue'

			objectA.prop = 'anotherValue'
			expect(objectB.prop).to.equal 'anotherValue'
			expect(objectC.prop).to.equal 'anotherValue'

			objectA.prop = 'diffValue'
			expect(objectB.prop).to.equal 'anotherValue'
			expect(objectC.prop).to.equal 'diffValue'
			restartSandbox()
		


		test "DOMText", ()-> if not isBrowser then @skip() else
			regA.textContent = regB.textContent = 'This line has "{{word}}" in it'
			SimplyBind('prop').of(objectA)
				.once.to('textContent.word').of(regA)
				.and.to('textContent.word').of(regB)

			objectA.prop = 'coin'
			expect(regA.textContent).to.equal 'This line has "coin" in it'
			expect(regB.textContent).to.equal 'This line has "coin" in it'

			objectA.prop = 'quotes'
			expect(regA.textContent).to.equal 'This line has "coin" in it'
			expect(regB.textContent).to.equal 'This line has "quotes" in it'
			restartSandbox()
		



		test "DOMValue", ()-> if not isBrowser then @skip() else
			SimplyBind('prop').of(objectA)
				.once.to('value').of(inputA)
				.and.to('value').of(inputB)

			objectA.prop = 'anotherValue'
			expect(inputA.value).to.equal 'anotherValue'
			expect(inputB.value).to.equal 'anotherValue'

			objectA.prop = 'diffValue'
			expect(inputA.value).to.equal 'anotherValue'
			expect(inputB.value).to.equal 'diffValue'
			restartSandbox()
		



		test "DOMAttr", ()-> if not isBrowser then @skip() else
			SimplyBind('prop').of(objectA)
				.once.to('attr:someattr').of(regA)
				.and.to('attr:someattr').of(regB)

			objectA.prop = 'anotherValue'
			expect(regA.getAttribute 'someattr').to.equal 'anotherValue'
			expect(regB.getAttribute 'someattr').to.equal 'anotherValue'

			objectA.prop = 'diffValue'
			expect(regA.getAttribute 'someattr').to.equal 'anotherValue'
			expect(regB.getAttribute 'someattr').to.equal 'diffValue'
			restartSandbox()




		test "Func", ()->
			invokeCountOnce = 0
			invokeCountTotal = 0
			
			SimplyBind('prop1').of(objectA)
				.once.to ()-> invokeCountOnce++; return
				.and.to ()-> invokeCountTotal++; return

			expect(invokeCountOnce).to.equal(0)
			expect(invokeCountTotal).to.equal(1)

			objectA.prop1 += 1
			expect(invokeCountOnce).to.equal(1)
			expect(invokeCountTotal).to.equal(2)

			objectA.prop1 += 1
			expect(invokeCountOnce).to.equal(1)
			expect(invokeCountTotal).to.equal(3)
			restartSandbox()




		test "Event", ()-> if not isBrowser then @skip() else
			dispatchCountOnce = 0
			dispatchCountTotal = 0

			regA.on 'once', ()-> dispatchCountOnce++
			regA.on 'total', ()-> dispatchCountTotal++
			
			SimplyBind('prop1').of(objectA)
				.once.to('event:once').of(regA)
				.and.to('event:total').of(regA)

			expect(dispatchCountOnce).to.equal(0)
			expect(dispatchCountTotal).to.equal(1)

			objectA.prop1 += 1
			expect(dispatchCountOnce).to.equal(1)
			expect(dispatchCountTotal).to.equal(2)

			objectA.prop1 += 1
			expect(dispatchCountOnce).to.equal(1)
			expect(dispatchCountTotal).to.equal(3)
			restartSandbox()





	test "Adding a transform shouldn't force an update to a one-time-binding", ()->
		objectA.prop = 1
		objectB.prop = 2
		
		SimplyBind('prop').of(objectA)
			.once.to('prop').of(objectB)
				.transform (value)-> value

		objectA.prop = 'anotherValue'
		expect(objectB.prop).to.equal 'anotherValue'

		objectA.prop = 'diffValue'
		expect(objectB.prop).to.equal 'anotherValue'
		restartSandbox()