@danielkalen/simplybind/test/specs/data-binding/type-Proxy.coffee

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

suite "Proxy", ()->
	test "The binding will be useless/ineffictive if the target property is not a function", ()->
		invokeCount = 0
		obj = regProp:'value'
		
		SimplyBind('func:regProp').of(obj)
			.transformSelf (args)-> [args[0]/3, args[1]/3]
			.to (value)-> invokeCount++

		expect(invokeCount).to.equal(0)
		obj.regProp = ()-> 'someValue'
		obj.regProp()
		expect(invokeCount).to.equal(0)


	test "If the object's property is redefined with another function, the old function will be discarded and the new will be wrapped", ()->
		invokeCount = fromSub:0, fromPub:0
		obj = base:10, test:(a,b)-> invokeCount.fromPub++; (a+b)*@base

		SimplyBind('func:test').of(obj).to (value)-> invokeCount.fromSub++

		expect(invokeCount.fromPub).to.equal(0)
		expect(invokeCount.fromSub).to.equal(0)
		obj.test(2,3)
		expect(invokeCount.fromPub).to.equal(1)
		expect(invokeCount.fromSub).to.equal(1)

		obj.test = obj.test
		expect(invokeCount.fromPub).to.equal(1)
		expect(invokeCount.fromSub).to.equal(1)
		
		obj.test(20,30)
		expect(invokeCount.fromPub).to.equal(2)
		expect(invokeCount.fromSub).to.equal(2)

		obj.test = (a,b)-> (a+b)*@base
		expect(invokeCount.fromPub).to.equal(2)
		expect(invokeCount.fromSub).to.equal(2)
				
		obj.test(20,30)
		expect(invokeCount.fromPub).to.equal(2)
		expect(invokeCount.fromSub).to.equal(3)

		obj.test(2,3)
		expect(invokeCount.fromPub).to.equal(2)
		expect(invokeCount.fromSub).to.equal(4)


	test "If the object's property is redefined with another non-function value, the binding will be ineffictive until set with a function value", ()->
		obj = base:10, test:(a,b)-> (a+b)*@base
		invokeCount = 0

		SimplyBind('func:test').of(obj).to (value)-> invokeCount++

		expect(invokeCount).to.equal(0)
		origWrappedFn = obj.test
		origWrappedFn(2,3)
		expect(invokeCount).to.equal(1)

		obj.test = 'anotherValue'
		expect(invokeCount).to.equal(1)
		origWrappedFn(20,30)
		expect(invokeCount).to.equal(2)
		obj.test = origWrappedFn
		expect(invokeCount).to.equal(2)
		obj.test(20,30)
		expect(invokeCount).to.equal(3)