code: def test_iter(self, corpus):
      assert isinstance(corpus, collections.abc.Iterable)
  
imports: import collections
  import itertools
  import numpy
  import pytest
  from spacy.tokens import Doc
  from textacy import Corpus
  from textacy import load_spacy_lang
label_desc: Use image node_id 3 for calling the TestCorpusDunder obj's underlying member method code with example usage: obj.test_iter(corpus) without return types