new_contents: """Utilities for testing wafer."""
  
  from django.contrib.auth import get_user_model
  from django.contrib.auth.models import Permission
  
  
  def create_user(username, email=None, superuser=False, perms=()):
      if superuser:
          create = get_user_model().objects.create_superuser
      else:
          create = get_user_model().objects.create_user
      if email is None:
          email = "%s@example.com" % username
      user = create(username, email, "%s_password" % username)
      for codename in perms:
          perm = Permission.objects.get(codename=codename)
          user.user_permissions.add(perm)
      if perms:
          user = get_user_model().objects.get(pk=user.pk)
      return user
  
subject: Add test utility for creating users.