code: def test_export_evokeds_unsupported_format(fmt, ext):
      """Test exporting evoked dataset to non-supported formats."""
      evoked = read_evokeds(fname_evoked)
      errstr = fmt.lower() if fmt != "auto" else "vhdr"
      with pytest.raises(
          ValueError, match=f"Format '{errstr}' is not .*"
      ):
          export_evokeds(f"output.{ext}", evoked, fmt=fmt)
  
imports: from contextlib import nullcontext
  from datetime import datetime, timezone
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_almost_equal, assert_array_equal
  from mne import Annotations, Epochs, create_info, read_epochs_eeglab, read_evokeds, read_evokeds_mff
  from mne.datasets import misc, testing
  from mne.export import export_evokeds, export_evokeds_mff
  from mne.fixes import _compare_version
  from mne.io import RawArray, read_raw_brainvision, read_raw_edf, read_raw_eeglab, read_raw_fif
  from mne.tests.test_epochs import _get_data
  from mne.utils import _check_edfio_installed, _record_warnings, _resource_path, object_diff
label_desc: Use image node_id 17 for calling a global function with example usage: test_export_evokeds_unsupported_format(fmt, ext) without return types