code: def _assert_reader_files_downloaded(readers, found_files):
      r_cond1 = "readers/README.rst" in found_files
      r_cond2 = "readers/README2.rst" in found_files
      if readers is not None and not readers:
          r_cond1 = not r_cond1
          r_cond2 = not r_cond2
      assert r_cond1
      assert r_cond2
  
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 4 for calling a global function with example usage: _assert_reader_files_downloaded(readers, found_files) without return types