load url_helpers to view in rspec

Author: chamnap

lib/liquid-rails/rspec/view_controller_context.rb

@@ -15,6 +15,7 @@ def setup_view_and_controller
           @controller.params    = {}
           @view.assign_controller(@controller)
           @view.class.send(:include, @controller._helpers)
+          @view.class.send(:include, Rails.application.routes.url_helpers)
         end
 
         def view