rosa-build/spec/factories/comments.rb

FactoryGirl.define do
  factory :comment do
    body { FactoryGirl.generate(:string) }
    association :user, :factory => :user
    association :commentable, :factory => :issue
    project { |c| c.commentable.project }
    after(:create) { |c| c.send(:new_comment_notifications) }
  end
end