# Copyright 2018 Joshua Bronson. All Rights Reserved.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

Test for consistency in ordered bidicts after handling duplicate keys/values
(when passing python's -O flag, this would previously fail
due to reliance on side effects in assert statements)::

    >>> from bidict import OrderedBidict, DuplicationError, RAISE, OVERWRITE
    >>> b = OrderedBidict([(0, 1)])
    >>> exc = None
    >>> try:
    ...     b.update([(0, 2), (3, 4), (5, 4)])
    ... except DuplicationError as e:
    ...     exc = e
    >>> exc is not None
    True
    >>> len(b.inv)
    1
    >>> exc = None
    >>> try:
    ...     b.putall([(2, 1), (2, 3)], on_dup_key=RAISE, on_dup_val=OVERWRITE)
    ... except DuplicationError as e:
    ...     exc = e
    >>> exc is not None
    True
    >>> len(b)
    1
    >>> b.forceupdate([(0, 1), (2, 3), (0, 3)])
    >>> b
    OrderedBidict([(0, 3)])

Test iterating over an ordered bidict as well as reversing::

    >>> b[4] = 5
    >>> b
    OrderedBidict([(0, 3), (4, 5)])
    >>> list(iter(b))
    [0, 4]
    >>> list(reversed(b))
    [4, 0]