class_docstr: Simple hub download and run test.
code: def test_error_repo(self):
      with self.assertRaises(RuntimeError):
          CacheManager().get_operator(
              "No-user/No-op", "main", True, False
          )
      with self.assertRaises(RuntimeError):
          CacheManager().get_pipeline("No-user/No-pipe", "main", True)
      with self.assertRaises(ValueError):
          CacheManager().get_pipeline("No-pipe", "main", True)
  
imports: import unittest
  from towhee.hub.cache_manager import CacheManager
label_desc: Use image node_id 1 for calling the TestCacheManager obj's underlying member method code with example usage: obj.test_error_repo() without return types