new_contents: import unittest
  import sys
  sys.path.append('soccer')
  import leagueproperties
  import leagueids
  import main
  
  class TestLoadData(unittest.TestCase):
  
      TEAMS_INFO_FILENAME = "teams.json"
  
      def set_up(self):
          pass
  
      def tear_down(self):
          pass
  
      def test_load_team_data(self):
          raised = False
          try:
              main.load_json(TestLoadData.TEAMS_INFO_FILENAME)["teams"]
          except IOError:
              raised = True
          self.assertFalse(raised)
  
      def test_load_league_properties(self):
          raised = False
          try:
              league_properties = leagueproperties.LEAGUE_PROPERTIES
              league_properties.keys()
          except AttributeError:
              raised = True
          self.assertFalse(raised)
  
      def test_load_league_ids(self):
          raised = False
          try:
              leage_ids = leagueids.LEAGUE_IDS
              leage_ids.keys()
          except AttributeError:
              raised = True
          self.assertFalse(raised)
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Implement simple unit tests for loading data at startup