Jsonfield duplicating records in production database after running manage.py test

[Christian Maillefaud]

Model:

class PermissionTemplate(models.Model):
    site = models.ForeignKey(
        Site,
        verbose_name=_("site"),
        on_delete=models.CASCADE,
        related_name="%(app_label)s_%(class)s_site"
    )
    on_site = CurrentSiteManager()
    name = models.CharField(_("nome"), max_length=30)
    values = JSONField()

Code in TestCase:

class TestPermission(TestCase):
      self.site, created = Site.objects.get_or_create(
            defaults={
                'domain': 'testserver'
            },
            id=settings.SITE_ID)
      self.permission_template, created = \
            PermissionTemplate.on_site.get_or_create(
                site=self.site,
                name='test_template',
                defaults={
                    'values': {
                        'open_imovel': 1,
                        'named_imovel': 3,
                        'sharing': 0,
                        'owner_data': 0,
                        'aggrements': 0,
                        'users': 0,
                        'internal': True,
                        'default': True
                    }
                }
            )