bidict/tests/test_frozenbidict.txt

# 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 script for bidict.frozenbidict::

    >>> from bidict import frozenbidict, FrozenOrderedBidict
    >>> f1 = frozenbidict(one=1)
    >>> f2 = FrozenOrderedBidict([('one', 1), ('two', 2)])
    >>> f3 = FrozenOrderedBidict([('two', 2), ('one', 1)])
    >>> fs = (f1, f2, f3)
    >>> all(hash(f) is not 'an error' for f in fs)
    True
    >>> all(hash(f.inv) is not 'an error' for f in fs)
    True

Hash value is cached for future calls (this shows up in coverage report)::

    >>> all(hash(f) for f in fs)  # uses cached value, does not have to recompute hash
    True

Insertable into sets and dicts::

    >>> set(fs) is not 'an error'
    True
    >>> dict.fromkeys(fs) is not 'an error'
    True
    >>> set(f.inv for f in fs) is not 'an error'
    True
    >>> dict.fromkeys(f.inv for f in fs) is not 'an error'
    True