def METHOD_NAME(self):
    # email should send upon reaching/crossing 90% of the plan limit
    prev_user_count = 80
    post_user_count = 90
    check_and_send_limit_email(self.domain, self.plan_limit, post_user_count, prev_user_count)
    self.assertEqual(len(mail.outbox), 1)
    self.assertEqual(mail.outbox[0].to, self.recipients)
    self.assertEqual(mail.outbox[0].subject,
                     "User count has reached 90% of the Plan limit for {}".format(self.domain))