moving to scripts

asq-env/lib/python3.9/site-packages/trio/tests/test_abc.py

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