class_docstr: Unittest for hub utils.
code: def test_update_text(self):
      with open("text.txt", "w", encoding="utf-8") as f1:
          f1.write("Hello towhee in test_ori.")
      HubUtils.update_text(
          ["Hello", "test_ori"],
          ["Unittest", "test_tar"],
          "text.txt",
          "new_text.txt",
      )
      with open("new_text.txt", "r", encoding="utf-8") as f1:
          new_text = f1.read()
      assert "test_tar" in new_text and "Unittest" in new_text
      os.remove("text.txt")
      os.remove("new_text.txt")
  
imports: import unittest
  import os
  from towhee.utils.hub_utils import HubUtils
label_desc: Use image node_id 2 for calling the TestHubUtils obj's underlying member method code with example usage: obj.test_update_text() without return types