southbay/spec/observing.spec.js

Cocoa-inspired key-value coding, binding, and observing for node

var $ = require('southbay'),
	vows = require('vows'),
	assert = require('assert'),
	o = $.Base.extend({
		nextLevelChange: function(p, o, c) {
			this.setValue(c).forKey('changeDict');
		}
	}),
	o2 = $.Base.extend({
		jeanShortsChange: function(p, o, c) {
			this.setValue(p).forKey('observedPath');
		}
	}),
	O = new o(),
	// passes in an initial value to the classes data model
	O2 = new o2({nextLevel: 'biodiesel'});

vows.describe('Southbay Key-Value Observing').addBatch({
	'A KVO Object': {
		topic: O,
		'implements key-value coding': function(kvo) {
			kvo.setValue('readyMade').forKey('mustache');
			assert.equal(O.valueForKey('mustache'), 'readyMade');
		},
		'can use keypaths': function(kvo) {
			kvo.setValue(true).forKeyPath('apparel.jeanShorts');
			assert.equal(O.valueForKeyPath('apparel.jeanShorts'), true);
		},
		'should be able to register an observer': function(kvo) {
			kvo.addObserver(O2).forKeyPath('apparel.jeanShorts').options(
				$.NEW).context('jeanShortsChange');
			assert.isObject(kvo._observers_['apparel.jeanShorts'][0].object);
		},
		'should notify an observer': function(kvo) {
			kvo.setValue(false).forKeyPath('apparel.jeanShorts');
			assert.equal(O2.valueForKey('observedPath'), 'apparel.jeanShorts');
		},
		'can recieve both old and new values via change dictionary': function(kvo) {
			O2.addObserver(kvo).forKeyPath('nextLevel').options(
				$.OLD, $.NEW).context('nextLevelChange');
			O2.setValue('food truck').forKey('nextLevel');
			var dict = kvo.valueForKey('changeDict'),
				ary = [dict.Old, dict.New];
			assert.deepEqual(ary, ['biodiesel', 'food truck']);
		}
	}
}).export(module);