class_docstr: Test basic data downloading functionality.
class_docstr_tok: ["Test","basic","data","downloading","functionality","."]
docstr: Test registering and retrieving all files fails when offline.
docstr_tok: ["Test","registering","and","retrieving","all","files","fails","when","offline","."]
code: def test_offline_retrieve_all(self):
      """Test registering and retrieving all files fails when offline."""
      import satpy
      from satpy.aux_download import retrieve_all
  
      with satpy.config.set(
          config_path=[self.tmpdir],
          data_dir=str(self.tmpdir),
          download_aux=False,
      ):
          pytest.raises(RuntimeError, retrieve_all)
  
imports: from unittest import mock
  import pytest
  import yaml
  from satpy.aux_download import DataDownloadMixin
  from satpy.modifiers import ModifierBase
label_desc: Use image node_id 6 for calling the TestDataDownload obj's underlying member method code with example usage: obj.test_offline_retrieve_all() without return types