code: def test_VolSymm_inputs():
      input_map = dict(
          args=dict(
              argstr="%s",
          ),
          clobber=dict(
              argstr="-clobber",
              usedefault=True,
          ),
          config_file=dict(
              argstr="-config_file %s",
              extensions=None,
          ),
          environ=dict(
              nohash=True,
              usedefault=True,
          ),
          fit_linear=dict(
              argstr="-linear",
          ),
          fit_nonlinear=dict(
              argstr="-nonlinear",
          ),
          input_file=dict(
              argstr="%s",
              extensions=None,
              mandatory=True,
              position=-3,
          ),
          input_grid_files=dict(),
          nofit=dict(
              argstr="-nofit",
          ),
          output_file=dict(
              argstr="%s",
              extensions=None,
              genfile=True,
              hash_files=False,
              name_source=["input_file"],
              name_template="%s_vol_symm.mnc",
              position=-1,
          ),
          trans_file=dict(
              argstr="%s",
              extensions=None,
              genfile=True,
              hash_files=False,
              keep_extension=False,
              name_source=["input_file"],
              name_template="%s_vol_symm.xfm",
              position=-2,
          ),
          verbose=dict(
              argstr="-verbose",
          ),
          x=dict(
              argstr="-x",
          ),
          y=dict(
              argstr="-y",
          ),
          z=dict(
              argstr="-z",
          ),
      )
      inputs = VolSymm.input_spec()
  
      for key, metadata in list(input_map.items()):
          for metakey, value in list(metadata.items()):
              assert getattr(inputs.traits()[key], metakey) == value
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_VolSymm_inputs() without return types