text: import unittest
  from unittest import mock
  import os
  from lusidtools.lpt import connect_lusid
  
  
  class ConnectLusidTests(unittest.TestCase):
      @mock.patch.dict(os.environ, {"FBN_LUSID_API_URL": ""})
      def test_missing_one_config(self):
          config = {}
          config["api"] = {}
          config["api"]["tokenUrl"] = "abc"
          config["api"]["username"] = "abc"
          config["api"]["password"] = os.environ.get("FBN_PASSWORD", "dummyPassword")
          config["api"]["clientId"] = "abc"
          config["api"]["clientSecret"] = "abc"
          config["api"]["apiUrl"] = None
  
          missing_config = connect_lusid.check_for_missing_config(config)
  
          self.assertEqual(1, len(missing_config))
          self.assertEqual(
              [{"Env variable": "FBN_LUSID_API_URL", "Secrets file key": "apiUrl"}],
              missing_config,
          )
  