class_docstr: Test transcoding from a missing file
class_docstr_tok: ["Test","transcoding","from","a","missing","file"]
code: def tearDown(self):
      decoder = FileDecoder
      self.assertRaises(IOError, decoder, self.source)
  
imports: from __future__ import division
  from timeside.core.processor import get_processor, ProcessPipe
  from timeside.plugins.decoder.aubio import AubioDecoder
  import os
  import unittest
  from unit_timeside import TestRunner
  from tools import tmp_file_sink
  from timeside.core.tools.test_samples import samples
label_desc: Use image node_id 2 for calling the TestTranscodingFromMissingFile obj's underlying member method code with example usage: obj.tearDown() without return types