class_docstr: Simple hub download and run test.
code: def test_download_pipe(self):
      CacheManager().get_pipeline(
          "towhee/test-revision-pipeline", "main", True
      )
      CacheManager().get_pipeline(
          "towhee/test-revision-pipeline", "v1", False
      )
  
imports: import unittest
  from towhee.hub.cache_manager import CacheManager
label_desc: Use image node_id 3 for calling the TestCacheManager obj's underlying member method code with example usage: obj.test_download_pipe() without return types