code: def test_obiszow_mtb_xcm() -> None:
      import bokeh.sampledata.mtb as bsm
  
      assert isinstance(bsm.obiszow_mtb_xcm, pd.DataFrame)
  
      # check detail for package data
      assert len(bsm.obiszow_mtb_xcm) == 978
  
imports: from __future__ import annotations
  import pytest
  import pandas
  from tests.support.util.api import verify_all
label_desc: Use image node_id 1 for calling a global function with example usage: test_obiszow_mtb_xcm() without return types