code: def test_make_label_vert(self, args, multidim_sels, labellers):
      name, expected_label = args
      labeller_arg = labellers.labellers[name]
      label = labeller_arg.make_label_vert(
          "theta", multidim_sels.sel, multidim_sels.isel
      )
      assert label == expected_label
  
file_path: arviz/arviz/tests/base_tests/test_labels.py
imports: import pytest
  from ...labels import BaseLabeller, DimCoordLabeller, DimIdxLabeller, IdxLabeller, MapLabeller, NoModelLabeller, NoVarLabeller
label_desc: Use image node_id 1 for calling the TestLabellers obj's underlying member method code with example usage: obj.test_make_label_vert(args, multidim_sels, labellers) without return types