class_docstr: Placeholder for a TestCase inside a result. As far as a TestResult
  is concerned, this looks exactly like a unit test. Used to insert
  arbitrary errors into a test suite run.
class_docstr_tok: ["Placeholder","for","a","TestCase","inside","a","result",".","As","far","as","a","TestResult","is","concerned",",","this","looks","exactly","like","a","unit","test",".","Used","to","insert","arbitrary","errors","into","a","test","suite","run","."]
code: def id(self):
      return self.description
  
imports: import sys
  from .None import case
  from .None import util
label_desc: Use image node_id 2 for calling the _ErrorHolder obj's underlying member method code with example usage: obj.id() and returns: self