code: def test_Calc_inputs():
      input_map = dict(
          args=dict(
              argstr="%s",
          ),
          environ=dict(
              nohash=True,
              usedefault=True,
          ),
          expr=dict(
              argstr='-expr "%s"',
              mandatory=True,
              position=3,
          ),
          in_file_a=dict(
              argstr="-a %s",
              extensions=None,
              mandatory=True,
              position=0,
          ),
          in_file_b=dict(
              argstr="-b %s",
              extensions=None,
              position=1,
          ),
          in_file_c=dict(
              argstr="-c %s",
              extensions=None,
              position=2,
          ),
          num_threads=dict(
              nohash=True,
              usedefault=True,
          ),
          other=dict(
              argstr="",
              extensions=None,
          ),
          out_file=dict(
              argstr="-prefix %s",
              extensions=None,
              name_source="in_file_a",
              name_template="%s_calc",
          ),
          outputtype=dict(),
          overwrite=dict(
              argstr="-overwrite",
          ),
          single_idx=dict(),
          start_idx=dict(
              requires=["stop_idx"],
          ),
          stop_idx=dict(
              requires=["start_idx"],
          ),
      )
      inputs = Calc.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_Calc_inputs() without return types