text: from unittest.mock import patch
  
  from django.test import TestCase
  
  from django_afip.clients import get_client
  
  
  class TestGetService(TestCase):
      def test_services_are_cached(self):
          service1 = get_client("wsfe", False)
          with patch.dict("django_afip.clients.WSDLS", values={}, clear=True):
              service2 = get_client("wsfe", False)
  
          self.assertEqual(service1, service2)
  
      def test_inexisting_service(self):
          with self.assertRaisesMessage(ValueError, "Unknown service name, nonexistant"):
              get_client("nonexistant", False)
  