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40 lines
762 B
Python
40 lines
762 B
Python
import abc
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from testutils import assertRaises
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class CustomInterface(abc.ABC):
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@abc.abstractmethod
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def a(self):
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pass
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@classmethod
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def __subclasshook__(cls, subclass):
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return NotImplemented
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# TODO raise an error if there are in any abstract methods not fulfilled
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# with assertRaises(TypeError):
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# CustomInterface()
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class Concrete:
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def a(self):
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pass
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CustomInterface.register(Concrete)
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class SubConcrete(Concrete):
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pass
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assert issubclass(Concrete, CustomInterface)
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assert issubclass(SubConcrete, CustomInterface)
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assert not issubclass(tuple, CustomInterface)
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assert isinstance(Concrete(), CustomInterface)
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assert isinstance(SubConcrete(), CustomInterface)
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assert not isinstance((), CustomInterface)
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