class_docstr: Test all graphers with WAV input media format
class_docstr_tok: ["Test","all","graphers","with","WAV","input","media","format"]
docstr: Test WAV to SpectrogramLinear
docstr_tok: ["Test","WAV","to","SpectrogramLinear"]
code: def testWav2SpectrogramLin(self):
      "Test WAV to SpectrogramLinear"
      from timeside.plugins.grapher.spectrogram_lin import (
          SpectrogramLinear,
      )
  
      self.source = samples["sweep.wav"]
      self.image = tempfile.NamedTemporaryFile(
          suffix="spectrogram_lin.png", delete=True
      )
      self.grapher = SpectrogramLinear(
          width=1024,
          height=256,
          bg_color=(0, 0, 0),
          color_scheme="default",
      )
  
file_path: TimeSide/tests/test_graphing.py
imports: from timeside.plugins.decoder.aubio import AubioDecoder
  import unittest
  from unit_timeside import TestRunner
  from timeside.core.tools.test_samples import samples
  import tempfile
  import os.path
label_desc: Use image node_id 8 for calling the TestGraphing obj's underlying member method code with example usage: obj.testWav2SpectrogramLin() without return types