content: from django.test import TestCase
  
  from netbox.registry import Registry
  
  
  class RegistryTest(TestCase):
  
      def test_set_store(self):
          reg = Registry({
              'foo': 123,
          })
          with self.assertRaises(TypeError):
              reg['bar'] = 456
  
      def test_mutate_store(self):
          reg = Registry({
              'foo': [1, 2],
          })
          reg['foo'].append(3)
          self.assertListEqual(reg['foo'], [1, 2, 3])
  
      def test_delete_store(self):
          reg = Registry({
              'foo': 123,
          })
          with self.assertRaises(TypeError):
              del reg['foo']
  