mirror of https://github.com/jab/bidict.git
39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 Joshua Bronson. All Rights Reserved.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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"""
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Test that if foreign code provides a class that conforms to
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BidirectionalMapping's interface, it is automatically a subclass.
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"""
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from bidict import BidirectionalMapping
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class MyBidirectionalMapping(dict):
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"""Dummy type implementing the BidirectionalMapping interface."""
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def __inverted__(self):
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for (key, val) in self.items():
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yield (val, key)
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@property
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def inv(self):
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"""Like :attr:`bidict.bidict.inv`."""
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return MyBidirectionalMapping(self.__inverted__())
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class OldStyleClass: # pylint: disable=old-style-class,no-init
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"""In Python 2 this is an old-style class (not derived from object)."""
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def test_bidi_mapping_subclasshook():
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"""Ensure issubclass(foo, BidirectionalMapping) works as expected."""
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assert issubclass(MyBidirectionalMapping, BidirectionalMapping)
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assert not issubclass(dict, BidirectionalMapping)
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# Make sure this works with old-style classes as expected.
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assert not issubclass(OldStyleClass, BidirectionalMapping)
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