code: def test_model_main_input_name(self):
      model_signature = inspect.signature(
          getattr(TimeSeriesTransformerModel, "forward")
      )
      # The main input is the name of the argument after `self`
      observed_main_input_name = list(
          model_signature.parameters.keys()
      )[1]
      self.assertEqual(
          TimeSeriesTransformerModel.main_input_name,
          observed_main_input_name,
      )
  
imports: import inspect
  import tempfile
  import unittest
  from huggingface_hub import hf_hub_download
  from transformers import is_torch_available
  from transformers.testing_utils import is_flaky, require_torch, slow, torch_device
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor
label_desc: Use image node_id 6 for calling the TimeSeriesTransformerModelTest obj's underlying member method code with example usage: obj.test_model_main_input_name() without return types