old_contents: # Copyright 2015 Pedro M. Baeza <pedro.baeza@tecnativa.com>
  # Copyright 2015 Antonio Espinosa <antonio.espinosa@tecnativa.com>
  # Copyright 2015 Javier Iniesta <javieria@antiun.com>
  # Copyright 2020 Tecnativa - Manuel Calero
  # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  
  from odoo.exceptions import UserError
  
  from . import base
  
  
  class PartnerMailListWizardCase(base.BaseCase):
      def test_add_to_mail_list(self):
          wizard = self.env["partner.mail.list.wizard"].create(
              {"mail_list_id": self.mailing_list.id}
          )
          wizard.partner_ids = [self.partner.id]
          wizard.add_to_mail_list()
          contacts = self.env["mailing.contact"].search(
              [("partner_id", "=", self.partner.id)]
          )
          cont = contacts.filtered(lambda r: wizard.mail_list_id in r.list_ids)
          self.assertEqual(len(cont), 1)
          self.check_mailing_contact_partner(cont)
          # This line does not create a new contact
          wizard.add_to_mail_list()
          self.assertEqual(len(self.partner.mass_mailing_contact_ids), 1)
  
          self.assertEqual(
              self.partner.mass_mailing_contact_ids.list_ids, self.mailing_list
          )
  
          list_2 = self.create_mailing_list({"name": "New list"})
          wizard.mail_list_id = list_2
          wizard.add_to_mail_list()
          self.assertEqual(len(self.partner.mass_mailing_contact_ids), 1)
          self.assertEqual(
              self.partner.mass_mailing_contact_ids.list_ids, self.mailing_list | list_2
          )
  
          partner = self.env["res.partner"].create({"name": "No email partner"})
          wizard.partner_ids = [partner.id]
          with self.assertRaises(UserError):
              wizard.add_to_mail_list()
  
new_contents: # Copyright 2015 Pedro M. Baeza <pedro.baeza@tecnativa.com>
  # Copyright 2015 Antonio Espinosa <antonio.espinosa@tecnativa.com>
  # Copyright 2015 Javier Iniesta <javieria@antiun.com>
  # Copyright 2020 Tecnativa - Manuel Calero
  # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  
  from odoo.exceptions import UserError
  
  from . import base
  
  
  class PartnerMailListWizardCase(base.BaseCase):
      def test_add_to_mail_list(self):
          wizard = self.env["partner.mail.list.wizard"].create(
              {"mail_list_id": self.mailing_list.id}
          )
          wizard.partner_ids = [self.partner.id]
          wizard.add_to_mail_list()
          contacts = self.env["mailing.contact"].search(
              [("partner_id", "=", self.partner.id)]
          )
          cont = contacts.filtered(lambda r: wizard.mail_list_id in r.list_ids)
          self.assertEqual(len(cont), 1)
          self.check_mailing_contact_partner(cont)
          # This line does not create a new contact
          wizard.add_to_mail_list()
          self.assertEqual(len(self.partner.mass_mailing_contact_ids), 1)
          self.assertEqual(
              self.partner.mass_mailing_contact_ids.list_ids, self.mailing_list
          )
  
          list_2 = self.create_mailing_list({"name": "New list"})
          wizard.mail_list_id = list_2
          wizard.add_to_mail_list()
          self.assertEqual(len(self.partner.mass_mailing_contact_ids), 1)
          self.assertEqual(
              self.partner.mass_mailing_contact_ids.list_ids, self.mailing_list | list_2
          )
  
          partner = self.env["res.partner"].create({"name": "No email partner"})
          wizard.partner_ids = [partner.id]
          with self.assertRaises(UserError):
              wizard.add_to_mail_list()
  
subject: Delete empty line