def METHOD_NAME(self):
    """Create temporary output folder and two audio track files."""
    self._output_path = tempfile.mkdtemp()
    # Create fake reference and tested (i.e., APM output) audio track files.
    silence = pydub.AudioSegment.silent(duration=1000, frame_rate=48000)
    fake_reference_signal = (signal_processing.SignalProcessingUtils.
                             GenerateWhiteNoise(silence))
    fake_tested_signal = (signal_processing.SignalProcessingUtils.
                          GenerateWhiteNoise(silence))
    # Save fake audio tracks.
    self._fake_reference_signal_filepath = os.path.join(
        self._output_path, 'fake_ref.wav')
    signal_processing.SignalProcessingUtils.SaveWav(
        self._fake_reference_signal_filepath, fake_reference_signal)
    self._fake_tested_signal_filepath = os.path.join(
        self._output_path, 'fake_test.wav')
    signal_processing.SignalProcessingUtils.SaveWav(
        self._fake_tested_signal_filepath, fake_tested_signal)