import pytest
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import attr
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from ..testing import assert_checkpoints
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from .. import abc as tabc
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async def test_AsyncResource_defaults():
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@attr.s
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class MyAR(tabc.AsyncResource):
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record = attr.ib(factory=list)
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async def aclose(self):
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self.record.append("ac")
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async with MyAR() as myar:
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assert isinstance(myar, MyAR)
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assert myar.record == []
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assert myar.record == ["ac"]
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def test_abc_generics():
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# Pythons below 3.5.2 had a typing.Generic that would throw
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# errors when instantiating or subclassing a parameterized
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# version of a class with any __slots__. This is why RunVar
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# (which has slots) is not generic. This tests that
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# the generic ABCs are fine, because while they are slotted
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# they don't actually define any slots.
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class SlottedChannel(tabc.SendChannel[tabc.Stream]):
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__slots__ = ("x",)
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def send_nowait(self, value):
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raise RuntimeError
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async def send(self, value):
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raise RuntimeError # pragma: no cover
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def clone(self):
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raise RuntimeError # pragma: no cover
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async def aclose(self):
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pass # pragma: no cover
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channel = SlottedChannel()
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with pytest.raises(RuntimeError):
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channel.send_nowait(None)
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