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youknowdot
37fdf4d2d9
Retain the native fallback and Python regression without modifying bundled Lib sources. Assisted-by: OpenAI Codex:model identifier unavailable
64 lines
1.2 KiB
Python
64 lines
1.2 KiB
Python
import abc
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from testutils import assert_raises
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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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with assert_raises(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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class NoClassAttribute:
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@property
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def __class__(self):
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raise AttributeError("no class attribute")
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instance = NoClassAttribute()
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assert not isinstance(instance, CustomInterface)
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CustomInterface.register(NoClassAttribute)
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assert isinstance(instance, CustomInterface)
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class_error = RuntimeError("class lookup failed")
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class BrokenClassAttribute:
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@property
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def __class__(self):
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raise class_error
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with assert_raises(RuntimeError) as caught:
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isinstance(BrokenClassAttribute(), CustomInterface)
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assert caught.exception is class_error
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