code: def test_download_successful(tmpdir):
      tmp = str(tmpdir)
      tmpfile = os.path.join(tmp, "README.md")
      mx.test_utils.download(
          "https://raw.githubusercontent.com/apache/mxnet/master/README.md",
          fname=tmpfile,
      )
      assert os.path.getsize(tmpfile) > 100
  
imports: import os
  import mxnet
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_download_successful(tmpdir) without return types