PrettyPhoto extension uses deface to override view in product detail. Original product.js.coffe from spree-core is temporaly override by itself file in this rails engine.
You must do (for working):
//= require store/spree_prettyphoto
in your main_app add at the end of app/assets/stylesheets/store/all.css:
*= require store/spree_prettyphoto
Ladies and gentlemens start your engines! That's all folks...
Example goes here.
Be sure to bundle your dependencies and then create a dummy test app for the specs to run against.
$ bundle $ bundle exec rake test_app $ bundle exec rspec spec
Copyright (c) 2012 [spree_prettyphoto Martin Rychlovsky], released under the New BSD License