code: def test_use_mfile():
      class TestClass(spm.SPMCommand):
          input_spec = spm.SPMCommandInputSpec
  
      dc = TestClass()  # dc = derived_class
      assert dc.inputs.mfile
  
file_path: nipype/nipype/interfaces/spm/tests/test_base.py
imports: import os
  import numpy
  import pytest
  from nipype.testing.fixtures import create_files_in_directory
  import nipype.interfaces.spm.base
  from nipype.interfaces.spm import no_spm
  import nipype.interfaces.matlab
  from nipype.interfaces.spm.base import SPMCommandInputSpec
  from nipype.interfaces.base import traits
label_desc: Use image node_id 2 for calling a global function with example usage: test_use_mfile() without return types