text: from test_plus.test import TestCase
  from users.admin import MyUserCreationForm
  
  
  class TestMyUserCreationForm(TestCase):
  
      def setUp(self):
          self.user = self.make_user('notalamode', 'notalamodespassword')
  
      def test_clean_username_success(self):
          # Instantiate the form with a new username
          form = MyUserCreationForm({
              'username': 'alamode',
              'password1': '7jefB#f@Cc7YJB]2v',
              'password2': '7jefB#f@Cc7YJB]2v',
          })
          # Run is_valid() to trigger the validation
          valid = form.is_valid()
          self.assertTrue(valid)
  
          # Run the actual clean_username method
          username = form.clean_username()
          self.assertEqual('alamode', username)
  
      def test_clean_username_false(self):
          # Instantiate the form with the same username as self.user
          form = MyUserCreationForm({
              'username': self.user.username,
              'password1': 'notalamodespassword',
              'password2': 'notalamodespassword',
          })
          # Run is_valid() to trigger the validation, which is going to fail
          # because the username is already taken
          valid = form.is_valid()
          self.assertFalse(valid)
  
          # The form.errors dict should contain a single error called 'username'
          self.assertTrue(len(form.errors) == 1)
          self.assertTrue('username' in form.errors)
  