code: def setUp(self):
      super(TestDecodingSegment, self).setUp()
      self.start = 1
      self.duration = 3
      self.expected_is_segment = True
      self.expected_duration = self.duration
  
imports: from __future__ import division
  from timeside.plugins.decoder.array import ArrayDecoder
  from unit_timeside import *
  import numpy
label_desc: Use image node_id 1 for calling the TestDecodingSegment obj's underlying member method code with example usage: obj.setUp() without return types