class_docstr: test Graphers from analyzers
class_docstr_tok: ["test","Graphers","from","analyzers"]
code: def setUp(self):
      source = samples["C4_scale.wav"]
      decoder_cls = timeside.core.get_processor("file_decoder")
      self.decoder = decoder_cls(uri=source)
  
file_path: TimeSide/tests/test_graphers_render_analyzers.py
imports: from __future__ import division
  import unittest
  from unit_timeside import TestRunner
  import timeside
  from timeside.core.tools.test_samples import samples
  from tempfile import NamedTemporaryFile
  import os
  from timeside.core.grapher import DisplayAnalyzer
label_desc: Use image node_id 1 for calling the Test_graphers_analyzers obj's underlying member method code with example usage: obj.setUp() without return types