test_registration.py

from django.test import TestCase

from users import userRegistration

class UserRegistartionTest(TestCase):
  
  """set up the tests"""
  def setup():
    
    user = {
      name : "",
      email : "",
      password : ""
    }
  """test that a user cannot submit empty details on registration"""
  def test_user_cannot_submit_empty_data():
    self.assertEqual(userRegistration(user), "You cannot submit empty data")

Ensure to separate your methods by putting a blank line between them. Also, check how your class has been named. Use UserRegistrationTest instead of UserRegistartionTest