  
          event = events[1]
          self.assertEqual(event[0], 'addSubTest')
          self.assertEqual(str(event[2]), 'dummy_test (test_runner.test_parallel.SampleFailingSubtest) (index=0)')
          self.assertEqual(repr(event[3][1]), "AssertionError('0 != 1',)")
  
          event = events[2]
          self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1',)")
 
</s> remove         self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1',)")
 </s> add         self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1'%s)" % trailing_comma)
        trailing_comma = '' if PY37 else ','
        self.assertEqual(repr(event[3][1]), "AssertionError('0 != 1'%s)" % trailing_comma)
  
          event = events[1]
          self.assertEqual(event[0], 'addSubTest')
          self.assertEqual(str(event[2]), 'dummy_test (test_runner.test_parallel.SampleFailingSubtest) (index=0)')
        trailing_comma = '' if PY37 else ','
        self.assertEqual(repr(event[3][1]), "AssertionError('0 != 1'%s)" % trailing_comma)
  
          event = events[2]
          self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1',)")
keep keep keep keep replace keep keep keep
 Refs #28814 -- Fixed test_runner failure on Python 3.7.

Due to https://bugs.python.org/issue30399. 
tests/test_runner/test_parallel.py