57 lines
1.3 KiB
Python
57 lines
1.3 KiB
Python
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# SPDX-License-Identifier: MIT
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import abc
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import inspect
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import pytest
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import attrs
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from attr._compat import PY310
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@pytest.mark.skipif(not PY310, reason="abc.update_abstractmethods is 3.10+")
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class TestUpdateAbstractMethods:
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def test_abc_implementation(self, slots):
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"""
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If an attrs class implements an abstract method, it stops being
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abstract.
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"""
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class Ordered(abc.ABC):
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@abc.abstractmethod
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def __lt__(self, other):
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pass
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@abc.abstractmethod
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def __le__(self, other):
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pass
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@attrs.define(order=True, slots=slots)
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class Concrete(Ordered):
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x: int
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assert not inspect.isabstract(Concrete)
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assert Concrete(2) > Concrete(1)
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def test_remain_abstract(self, slots):
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"""
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If an attrs class inherits from an abstract class but doesn't implement
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abstract methods, it remains abstract.
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"""
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class A(abc.ABC):
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@abc.abstractmethod
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def foo(self):
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pass
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@attrs.define(slots=slots)
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class StillAbstract(A):
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pass
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assert inspect.isabstract(StillAbstract)
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with pytest.raises(
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TypeError, match="class StillAbstract with abstract method foo"
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):
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StillAbstract()
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