code: def test_register(self) -> None:
      @covar_module_argparse.register(DummyKernel)
      def _argparse(kernel: DummyKernel) -> None:
          pass
  
      self.assertEqual(covar_module_argparse[DummyKernel], _argparse)
  
imports: from __future__ import annotations
  from unittest.mock import patch
  import torch
  from ax.models.torch.botorch_modular.input_constructors.covar_modules import covar_module_argparse
  from ax.models.torch.botorch_modular.kernels import ScaleMaternKernel
  from ax.utils.common.testutils import TestCase
  from botorch.models.gp_regression import SingleTaskGP
  from botorch.models.multitask import MultiTaskGP
  from botorch.utils.datasets import SupervisedDataset
  from gpytorch.kernels.kernel import Kernel
  from gpytorch.priors import GammaPrior
label_desc: Use image node_id 3 for calling the CovarModuleArgparseTest obj's underlying member method code with example usage: obj.test_register() without return types