mirror of https://github.com/jab/bidict.git
21 lines
557 B
Python
21 lines
557 B
Python
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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 DumbBidirectionalMapping(dict):
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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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return DumbBidirectionalMapping(self.__inverted__())
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def test_subclasshook():
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assert issubclass(DumbBidirectionalMapping, BidirectionalMapping)
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assert not issubclass(dict, BidirectionalMapping)
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