class_docstr: A test result class that can print formatted text results to a stream.
  
  Used by TextTestRunner.
code: def addFailure(self, test, err):
      unittest.TestResult.addFailure(self, test, err)
      if self.showAll:
          self.stream.writeln("FAIL")
      elif self.dots:
          self.stream.write("F")
  
imports: import unittest
  import doctest
  import sys
  import time
  import timeside.core
label_desc: Use image node_id 6 for calling the _TextTestResult obj's underlying member method code with example usage: obj.addFailure(test, err) without return types