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 value(self):
      return self.count
  
imports: from promise import Promise
  from .utils import assert_exception
  from threading import Event
label_desc: Use image node_id 3 for calling the Counter obj's underlying member method code with example usage: obj.value() and returns: self