docstr: No effect and codec will return the same result
code: def test_null(self):
      """No effect and codec will return the same result"""
      sample_rate = 8000
      frames_per_chunk = 256
  
      effector = AudioEffector(effect=None, format=None)
      original = get_sinusoid(
          n_channels=3, sample_rate=sample_rate, channels_first=False
      )
  
      # one-go
      output = effector.apply(original, sample_rate)
      self.assertEqual(original, output)
      # streaming
      for i, chunk in enumerate(
          effector.stream(original, sample_rate, frames_per_chunk)
      ):
          start = i * frames_per_chunk
          end = (i + 1) * frames_per_chunk
          self.assertEqual(original[start:end, :], chunk)
  
file_path: audio/test/torchaudio_unittest/io/effector_test.py
imports: from parameterized import parameterized
  from torchaudio.io import AudioEffector
  from torchaudio_unittest.common_utils import get_sinusoid, skipIfNoFFmpeg, TorchaudioTestCase
  from .common import lt42
label_desc: Use image node_id 1 for calling the EffectorTest obj's underlying member method code with example usage: obj.test_null() without return types