code: def test_correct_parameters_multi_channels(
      self, mode, filling, boundaries
  ):
      self.assertIsInstance(
          SignalRandShift(mode, filling, boundaries), SignalRandShift
      )
      sig = np.load(TEST_SIGNAL)
      shifted = SignalRandShift(mode, filling, boundaries)
      shiftedsignal = shifted(sig)
      self.assertEqual(shiftedsignal.shape[1], sig.shape[1])
  
file_path: MONAI/tests/test_signal_rand_shift.py
imports: from __future__ import annotations
  import os
  import unittest
  from unittest import skipUnless
  import numpy
  from parameterized import parameterized
  from monai.transforms.signal.array import SignalRandShift
  from monai.utils import optional_import
  from monai.utils.type_conversion import convert_to_tensor
label_desc: Use image node_id 1 for calling the TestSignalRandShiftNumpy obj's underlying member method code with example usage: obj.test_correct_parameters_multi_channels(mode, filling, boundaries) without return types