sign_controller.js

import Map from 'can/map/';
import List from 'can/list/';
import 'can/map/define/';
import { Config } from 'menuboard-manager/config/config/';
import { Storage } from 'menuboard-manager/utils/storage/';
import Sign from 'menuboard-manager/models/sign';
import Presentation from 'menuboard-manager/models/presentation';
import Parser from 'menuboard-manager/utils/parser/';

export const SignController = Map.extend({
	define: {
		signPromise: {
			get() {
				return Sign.getList({mac: this.attr('mac')});
			}
		},
		sign: {
			get(last, set) {
				var self = this;
				this.attr('signPromise').then(function(s) {
					var sign = s[0], actpres, curpres;

					// 1st check if there is only 1 active presentation,
					// if only 1 presentation exists at all, use it regardless
					// whether it is marked active or not (better than a blank screen)
					if(sign.presentations.length === 1) {
						// don't need to worry about scheduling or any other multi-presention logic
						curpres = self.processPresentation(sign.presentations[0]);
						new Presentation({id: curpres.id, data: curpres}).save();
						self.attr('currentPresentation', curpres.id);
						set(sign);
					} else {
						actpres = sign.presentations.filter(function(pres) {
							return pres.props.active;
						});
						if(!actpres.length) {
							// no active presentations, throw error...
						} else if(actpres.length === 1) {
							// only 1 active presentation, treat like only presentation
							curpres = self.processPresentation(actpres[0]);
							new Presentation({id: curpres.id, data: curpres}).save();
							self.attr('currentPresentation', curpres.id);
							set(sign);
						} else {
							// multiple presentations, need to check scheduling, etc.
						}
					}
				});
			}
		},
		currentPresentation: {
		},
		mac: {
			get() {
				var mac = Storage.get('mac');
				if(!mac) {
					if(Config().attr('isLFD')) {
						// running on monitor, get from SEF plugin
					} else {
						// running in browser, use preset value (for now)
						mac = 'a4be90d1';
					}
				}
				return mac;
			}
		}
	},
	processPresentation(pres) {
		var processed = Parser.parsePresentation(pres);
		return processed;
	}
});

export default SignController;

Here is the unit test calling the code where set is undefined

QUnit.test('Sign Setup', function () {
    var sc = new SignController(), oldmac = Storage.get('mac');
    Storage.store('mac', 'a1b2c3d4');
    QUnit.notOk(sc.attr('currentPresentation'));
    sc.attr('sign');
    QUnit.deepEqual(sc.attr('currentPresentation'), 'test', 'currentPresentation id match id from fixture');
    oldmac ? Storage.store('mac', oldmac) : Storage.delete('mac');
});