61 lines
1.6 KiB
Python
61 lines
1.6 KiB
Python
# SPDX-License-Identifier: MIT
|
|
|
|
import abc
|
|
import inspect
|
|
|
|
import pytest
|
|
|
|
import attrs
|
|
|
|
from attr._compat import PY310, PY_3_12_PLUS
|
|
|
|
|
|
@pytest.mark.skipif(not PY310, reason="abc.update_abstractmethods is 3.10+")
|
|
class TestUpdateAbstractMethods:
|
|
def test_abc_implementation(self, slots):
|
|
"""
|
|
If an attrs class implements an abstract method, it stops being
|
|
abstract.
|
|
"""
|
|
|
|
class Ordered(abc.ABC):
|
|
@abc.abstractmethod
|
|
def __lt__(self, other):
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def __le__(self, other):
|
|
pass
|
|
|
|
@attrs.define(order=True, slots=slots)
|
|
class Concrete(Ordered):
|
|
x: int
|
|
|
|
assert not inspect.isabstract(Concrete)
|
|
assert Concrete(2) > Concrete(1)
|
|
|
|
def test_remain_abstract(self, slots):
|
|
"""
|
|
If an attrs class inherits from an abstract class but doesn't implement
|
|
abstract methods, it remains abstract.
|
|
"""
|
|
|
|
class A(abc.ABC):
|
|
@abc.abstractmethod
|
|
def foo(self):
|
|
pass
|
|
|
|
@attrs.define(slots=slots)
|
|
class StillAbstract(A):
|
|
pass
|
|
|
|
assert inspect.isabstract(StillAbstract)
|
|
expected_exception_message = (
|
|
"^Can't instantiate abstract class StillAbstract without an "
|
|
"implementation for abstract method 'foo'$"
|
|
if PY_3_12_PLUS
|
|
else "class StillAbstract with abstract method foo"
|
|
)
|
|
with pytest.raises(TypeError, match=expected_exception_message):
|
|
StillAbstract()
|