text: from django.db import models
  from django.test import TestCase
  
  from django_deferred_polymorph.manager import DeferredPolymorphManager
  from .models import SimpleDeferredModel
  
  
  class ManagerTests(TestCase):
      def test_default_manager_is_deferred_manager(self):
          self.assertTrue(
              SimpleDeferredModel._default_manager is SimpleDeferredModel.objects)
          self.assertTrue(
              SimpleDeferredModel._default_manager.__class__ is DeferredPolymorphManager)
  
      def test_base_manager_is_django_default_manager(self):
          self.assertTrue(
              SimpleDeferredModel._base_manager.__class__ is models.Manager)
  