FactoryGirl-ish definitions in Jasmine

factories.js

/*
 * Set up factories, then create them in tests with (for example):
 *
 *   LineItemFactory();
 *
 * Or with attributes / overrides:
 *
 *   LineItemFactory({
 *     "id": 123,
 *     "order": OrderFactory({"firstName": "Example Associated Record Override"}),
 *     "quantity": 4
 *   });
 */
(function(){
  function setUpFactory(type, defaultAttributes) {
    return function(attributes) {
      var defaults = (defaultAttributes instanceof Function ? defaultAttributes() : defaultAttributes);
      var buildWithAttrs = _.extend({}, defaults, attributes);
      return new type(buildWithAttrs);
    }
  }

  //// Factories ////

  window.LineItemFactory = setUpFactory(LineItem, function(){return{
    'id': randomId(),
    'order': OrderFactory(),
    'name': 'Some Product Name',
    'price': '14.99',
    'quantity': 1,
    'path': '/products/some-product-name',
    'availability': 'Available now (shipped in 3-5 days)',
    'formatName': 'DVD',
    'imageUrl': 'http://s3.amazonaws.com/myexample/assets/products/123/thumb.jpg?12345',
    'variantOptions': 'Colour: Blue'
  }});

  window.OrderFactory = setUpFactory(Order, function(){return{
    'id': randomId(),
    'number': 'E12345'
  }});


  //// Misc Helpers ////

  function randomId() {
    return Math.floor(Math.random() * 999999) + 1;
  }

})();