First draft: wondering if anyone else would love to see a RSpec-like lazy-initializing let() function introduced into @jasminebdd

jasmine-let.js

function lazy(fn) {
   return _.once(fn);
}

describe('Expired Item View', function() {
   var item, view, rendered;

   beforeEach(function() {
     item = lazy(function() { return {}; });
     view = lazy(function() { return new APP.Views.ExpiredItem({ item: item() }); });
     rendered = lazy(function() { return view().render().el });
   });

   it('renders as a list item', function() {
     expect($(rendered())).toBe('li');
   });

   context('when it can be renewed', function() {
     beforeEach(function() {
       item = lazy(function() { return { renewable: true }; });
     });

     it('has the renewable class', function() {
       expect($(rendered()).toBe('li.renewable');
     });
   });
 });