code: def test_reader_invalid_file():
      # cannot use the BaseReader
      with pytest.raises(FileNotFoundError, match="does not exist"):
          pv.DICOMReader("dummy/")
  
imports: import os
  import platform
  import numpy
  import pytest
  import pyvista
  from pyvista import examples
  from pyvista.core.utilities.fileio import _try_imageio_imread
  from pyvista.examples.downloads import download_file
label_desc: Use image node_id 2 for calling a global function with example usage: test_reader_invalid_file() without return types