code: def test_GTMPVC_outputs():
      output_map = dict(
          gtm_file=dict(
              extensions=None,
          ),
          gtm_stats=dict(
              extensions=None,
          ),
          hb_dat=dict(
              extensions=None,
          ),
          hb_nifti=dict(
              extensions=None,
          ),
          input_file=dict(
              extensions=None,
          ),
          mgx_ctxgm=dict(
              extensions=None,
          ),
          mgx_gm=dict(
              extensions=None,
          ),
          mgx_subctxgm=dict(
              extensions=None,
          ),
          nopvc_file=dict(
              extensions=None,
          ),
          opt_params=dict(
              extensions=None,
          ),
          pvc_dir=dict(),
          rbv=dict(
              extensions=None,
          ),
          ref_file=dict(
              extensions=None,
          ),
          reg_anat2pet=dict(
              extensions=None,
          ),
          reg_anat2rbvpet=dict(
              extensions=None,
          ),
          reg_pet2anat=dict(
              extensions=None,
          ),
          reg_rbvpet2anat=dict(
              extensions=None,
          ),
          yhat=dict(
              extensions=None,
          ),
          yhat0=dict(
              extensions=None,
          ),
          yhat_full_fov=dict(
              extensions=None,
          ),
          yhat_with_noise=dict(
              extensions=None,
          ),
      )
      outputs = GTMPVC.output_spec()
  
      for key, metadata in list(output_map.items()):
          for metakey, value in list(metadata.items()):
              assert getattr(outputs.traits()[key], metakey) == value
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_GTMPVC_outputs() without return types