#!/usr/bin/env python3
# -*- encoding: utf-8 -*-
# ---------------------------------------------------------------------
# Exception ABC tests
# ---------------------------------------------------------------------
# Copyright (c) 2015 Medardo Rodriguez <med@merchise.org>

# Created on 2015-10-20

'''Problem using ABCs with exceptions in Python 3 and -BTW- in PyPy.

When I run the next code in all my installed versions of Python 3 (and the
equivalent code for PyPy and CPython 2.7):

- Runs OK in CPython 2.7 equivalent code (using `ABCMeta` as meta-class).

- Fails in PyPy and all versions of Python 3.

.. for: https://bugs.python.org

'''

from __future__ import (division as _py3_division,
                        print_function as _py3_print,
                        absolute_import as _py3_abs_import)


from abc import ABC


class APIError(ABC, Exception):
    '''Sample Exception for the API layer.'''
    pass


@APIError.register
class DriverError(Exception):
    '''Sample Exception for the drivers (concrete implementations) layer.'''
    pass


def do_test():
    '''Should return ``(1000, 100)``.'''
    one = 0
    try:
        raise APIError('This has no sense, but any way tested.')
        one += 10
    except DriverError:
        one += 100
    except Exception:
        one += 1000

    two = 0
    try:
        raise DriverError('Test driver again API exception.')
        two += 10
    except APIError:
        two += 100
    except Exception:
        two += 1000

    return one, two

if __name__ == '__main__':
    assert issubclass(DriverError, APIError), 'This runs OK in all versions.'

    assert do_test() == (1000, 100), ('WTF: Only working in CPython 2.7 '
                                      'equivalent code.')

    print("What's happening.")