class_docstr: TFRecordIterator test
class_docstr_tok: ["TFRecordIterator","test"]
code: def setUp(self):
      super(TFRecordIteratorTest, self).setUp()
      self._num_records = 7
  
imports: import gzip
  import os
  import random
  import string
  import zlib
  import six
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.lib.io import tf_record
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 1 for calling the TFRecordIteratorTest obj's underlying member method code with example usage: obj.setUp() without return types