def METHOD_NAME(self, err, test):
    """Converts a sys.exc_info()-style tuple of values into a string."""
    exctype, value, tb = err
    # Skip test runner traceback levels
    while tb and self._is_relevant_tb_level(tb):
        tb = tb.tb_next
    if exctype is test.failureException:
        # Skip assert*() traceback levels
        length = self._count_relevant_tb_levels(tb)
        msgLines = traceback.format_exception(exctype, value, tb, length)
    else:
        msgLines = traceback.format_exception(exctype, value, tb)
    if self.buffer:
        output = sys.stdout.getvalue()
        error = sys.stderr.getvalue()
        if output:
            if not output.endswith('\n'):
                output += '\n'
            msgLines.append(STDOUT_LINE % output)
        if error:
            if not error.endswith('\n'):
                error += '\n'
            msgLines.append(STDERR_LINE % error)
    return ''.join(msgLines)