code: def test_download(self):
      for loader in [RTELoader, QNLILoader, SNLILoader, MNLILoader]:
          loader().download()
      with pytest.raises(Exception):
          QuoraLoader().load()
  
file_path: fastNLP/tests/io/loader/test_matching_loader.py
imports: import pytest
  import os
  from fastNLP.io import DataBundle
  from fastNLP.io.loader.matching import RTELoader, QNLILoader, SNLILoader, QuoraLoader, MNLILoader, BQCorpusLoader, CNXNLILoader, LCQMCLoader
label_desc: Use image node_id 1 for calling the TestMatchingDownload obj's underlying member method code with example usage: obj.test_download() without return types