def _test():
    """
    >>> text = "Line\\\\nLong Line\\\\\\nVery long line and...\\nHere \\n\\n \\n\\n \\n \\\\n"
    >>> for i in range(1, 80):
    ...     if not join_long_lines(break_long_lines(text, i)) == text:
    ...         raise Exception("Test failure")
    """
    pass
