join problem

gistfile1.js

var Levers = function() {
  var exports = {
    select: function(ids, levers, defaults) {
      function mapper(element) {
        return levers[element] || _(defaults).extend({id: element});
      }
      return _(ids).map(mapper);
    },

    objectify: function(levers) {
      function reducer(obj, value) {
        obj[value.id] = value;
        return obj;
      }
      var object = _(levers).reduce(reducer, {})
      return object;
    }
  }
  return exports;
}

gistfile2.js

describe('Levers', function() {
  describe('#select()', function() {
    it("defaults if the value doesn't exist", function(done) {
      var ids = ['b']
      var obj = {}
      var defaults = {val: 'hello'}
      var expected = [{id: 'b', val: 'hello'}]
      expect(Levers().select(ids, obj, defaults)).toEqual(expected)
    })

    it("selects elements from object into an array", function() {
      var ids = ['b'] 
      var obj = {'a': {id: "a"}, 'b': {id: "b"}}
      var expected = [{id: 'b'}]
      expect(Levers().select(ids, obj)).toEqual(expected)
    })
  })
  describe('#Objectify', function() {
    it("converts an array of objects to a single object", function() {
      var array = [{id: 'a'}, {id: 'b'}];
      expect(Levers().objectify(array)).toEqual({'a': array[0], 'b': array[1]});
    })
  })
})