new_contents: import os
  import unittest
  
  from ..checker import Checker
  from ..loader import Loader
  from ..types import LocalSetting
  
  
  LOCAL_SETTINGS_FILE = os.path.join(os.path.dirname(__file__), 'local.cfg#test')
  
  
  class TestChecker(unittest.TestCase):
  
      @classmethod
      def setUpClass(cls):
          cls.checker = Checker(LOCAL_SETTINGS_FILE)
          cls.loader = Loader(LOCAL_SETTINGS_FILE)
  
      def test_checker(self):
          local_setting = LocalSetting('default value')
          settings = self.loader.load({
              'LOCAL_SETTING': local_setting,
          })
          self.checker.check(settings)
  
subject: Add initial checker tests