class_docstr: A helper class with some side effects
  we can test.
class_docstr_tok: ["A","helper","class","with","some","side","effects","we","can","test","."]
code: def __init__(self):
      self.count = 0
  
imports: from promise import Promise
  from .utils import assert_exception
  from threading import Event
label_desc: Use image node_id 1 to create a new Counter object  with example: obj = Counter()