code: def test_correct_parameters_multi_channels(self):
      self.assertIsInstance(
          SignalFillEmpty(replacement=0.0), SignalFillEmpty
      )
      sig = convert_to_tensor(np.load(TEST_SIGNAL))
      sig[:, 123] = convert_to_tensor(np.NAN)
      fillempty = SignalFillEmpty(replacement=0.0)
      fillemptysignal = fillempty(sig)
      self.assertTrue(not torch.isnan(fillemptysignal).any())
  
file_path: MONAI/tests/test_signal_fillempty.py
imports: from __future__ import annotations
  import os
  import unittest
  import numpy
  import torch
  from monai.transforms import SignalFillEmpty
  from monai.utils.type_conversion import convert_to_tensor
  from tests.utils import SkipIfBeforePyTorchVersion
label_desc: Use image node_id 1 for calling the TestSignalFillEmptyTorch obj's underlying member method code with example usage: obj.test_correct_parameters_multi_channels() without return types