code: def test_shift_multichannel(self):
      samples = np.array(
          [[0.75, 0.5, -0.25, -0.125], [0.9, 0.5, -0.25, -0.125]],
          dtype=np.float32,
      )
      sample_rate = 4000
  
      augment = Shift(
          min_shift=0.5, max_shift=0.5, fade_duration=0.0, p=1.0
      )
      processed_samples = augment(
          samples=samples, sample_rate=sample_rate
      )
  
      assert_almost_equal(
          processed_samples,
          np.array(
              [[-0.25, -0.125, 0.75, 0.5], [-0.25, -0.125, 0.9, 0.5]],
              dtype=np.float32,
          ),
      )
      assert processed_samples.dtype == np.float32
  
file_path: audiomentations/tests/test_shift.py
imports: import numpy
  import pytest
  from numpy.testing import assert_almost_equal
  from audiomentations import Shift
label_desc: Use image node_id 5 for calling the TestShift obj's underlying member method code with example usage: obj.test_shift_multichannel() without return types