code: def _should_download(cache_key):
      """Check if we're running tests and can download this file."""
      return not RUNNING_TESTS or "README" in cache_key
  
imports: import logging
  import os
  import pooch
  import satpy
label_desc: Use image node_id 4 for calling a global function with example usage: _should_download(cache_key) and returns: unknown