class_docstr: Test basic data downloading functionality.
class_docstr_tok: ["Test","basic","data","downloading","functionality","."]
code: def _setup_custom_configs(self, tmpdir):
      _setup_custom_composite_config(tmpdir)
      _setup_custom_reader_config(tmpdir)
      _setup_custom_writer_config(tmpdir)
      self.tmpdir = tmpdir
  
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 1 for calling the TestDataDownload obj's underlying member method code with example usage: obj._setup_custom_configs(tmpdir) without return types