class_docstr: Test download tools
code: def setUp(self):
      self.url = "https://raw.githubusercontent.com/towhee-io/towhee/main/towhee_logo.png"
      self.target = "./"
      self.target_file = os.path.join(self.target, "towhee_logo.png")
  
file_path: towhee/tests/unittests/models/utils/test_download.py
imports: import unittest
  import os
  from towhee.models.utils.download import download_from_url, checksum
label_desc: Use image node_id 1 for calling the TestDownload obj's underlying member method code with example usage: obj.setUp() without return types