class_docstr: Test basic data downloading functionality.
class_docstr_tok: ["Test","basic","data","downloading","functionality","."]
docstr: Test that find_registerable doesn't find anything when limited.
docstr_tok: ["Test","that","find_registerable","does","n't","find","anything","when","limited","."]
code: def test_limited_find_registerable(self):
      """Test that find_registerable doesn't find anything when limited."""
      import satpy
      from satpy.aux_download import find_registerable_files
  
      file_registry = {}
      with satpy.config.set(config_path=[self.tmpdir]), mock.patch(
          "satpy.aux_download._FILE_REGISTRY", file_registry
      ):
          found_files = find_registerable_files(
              readers=[],
              writers=[],
              composite_sensors=[],
          )
          assert not found_files
  
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 3 for calling the TestDataDownload obj's underlying member method code with example usage: obj.test_limited_find_registerable() without return types