def test_create

    num_deliveries = ActionMailer::Base.deliveries.size
    @user = User.new(:firstName=>'foo', :lastName=>'bar', :mail=>'a@b.com')
    assert @user.save!, @user.errors.full_messages.join("; ")
    assert_equal num_deliveries+1, ActionMailer::Base.deliveries.size
  end


class User < ActiveRecord::Base
    before_create :sendMail

   def sendMail
     email=RegistrationMailer.create_confirm(self)
     email.set_content_type("text/html")
     RegistrationMailer.deliver(email)
   end

end

class RegistrationMailer < ActionMailer::Base

  def confirm(user, sent_at = Time.now)
    @subject    = 'registration'
    @body["mail"] = user.mail
    @body["userid"] = user.id
    @body["password"] = user.password
    @from       = 'noreply@xxx'
    @sent_on    = sent_at
    @recipients = user.mail
  end
end