new_contents: from .helper import BJOTest
  from bernard.actors import Locker, Notifier
  from bernard.loader import YAMLLoader
  from praw.models import Comment, Submission
  
  
  class TestValidation(BJOTest):
      def setUp(self):
          super().setUp()
          self.loader = YAMLLoader(self.db, self.cur, self.subreddit)
  
      def test_bad_param_type(self):
          params = {'text': 3}
          with self.assertRaises(RuntimeError):
              self.loader.validate_subactor_config(Notifier, params, [])
  
      def test_good_param_type(self):
          params = {'text': "foobar"}
          self.loader.validate_subactor_config(Notifier, params, [])
  
      def test_bad_target_type(self):
          with self.assertRaises(RuntimeError):
              self.loader.validate_subactor_config(Locker, {}, [Comment])
  
      def test_good_target_type(self):
          self.loader.validate_subactor_config(Locker, {}, [Submission])
  
subject: Add some tests for the new validation logic