code: def test_Cat_inputs():
      input_map = dict(
          args=dict(
              argstr="%s",
          ),
          environ=dict(
              nohash=True,
              usedefault=True,
          ),
          in_files=dict(
              argstr="%s",
              mandatory=True,
              position=-2,
          ),
          keepfree=dict(
              argstr="-nonfixed",
          ),
          num_threads=dict(
              nohash=True,
              usedefault=True,
          ),
          omitconst=dict(
              argstr="-nonconst",
          ),
          out_cint=dict(
              xor=[
                  "out_format",
                  "out_nice",
                  "out_double",
                  "out_fint",
                  "out_int",
              ],
          ),
          out_double=dict(
              argstr="-d",
              xor=[
                  "out_format",
                  "out_nice",
                  "out_int",
                  "out_fint",
                  "out_cint",
              ],
          ),
          out_file=dict(
              argstr="> %s",
              extensions=None,
              mandatory=True,
              position=-1,
              usedefault=True,
          ),
          out_fint=dict(
              argstr="-f",
              xor=[
                  "out_format",
                  "out_nice",
                  "out_double",
                  "out_int",
                  "out_cint",
              ],
          ),
          out_format=dict(
              argstr="-form %s",
              xor=[
                  "out_int",
                  "out_nice",
                  "out_double",
                  "out_fint",
                  "out_cint",
              ],
          ),
          out_int=dict(
              argstr="-i",
              xor=[
                  "out_format",
                  "out_nice",
                  "out_double",
                  "out_fint",
                  "out_cint",
              ],
          ),
          out_nice=dict(
              argstr="-n",
              xor=[
                  "out_format",
                  "out_int",
                  "out_double",
                  "out_fint",
                  "out_cint",
              ],
          ),
          outputtype=dict(),
          sel=dict(
              argstr="-sel %s",
          ),
          stack=dict(
              argstr="-stack",
          ),
      )
      inputs = Cat.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_Cat_inputs() without return types