Remove deprecated usage of coroutine.

.github/workflows/test.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["pypy3.9", "pypy3.10", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

test/test_memoize_decorator.py

@@ -1,5 +1,5 @@
 from asyncio import (
-    coroutine, ensure_future, Event, gather, get_event_loop, new_event_loop, set_event_loop
+    ensure_future, Event, gather, get_event_loop, new_event_loop, set_event_loop
 )
 from atools import memoize
 import atools._memoize_decorator as test_module
@@ -437,9 +437,15 @@ async def foo() -> None:
 @pytest.mark.asyncio
 async def test_async_locks_async(async_lock: MagicMock) -> None:
     async_lock_context = async_lock.return_value = MagicMock()
-    type(async_lock_context).__aenter__ = \
-        coroutine(lambda *args, **kwargs: async_lock_context)
-    type(async_lock_context).__aexit__ = coroutine(lambda *args, **kwargs: None)
+
+    async def __aenter__(*args, **kwargs):
+        return async_lock_context
+
+    async def __aexit__(*args, **kwargs):
+        ...
+
+    type(async_lock_context).__aenter__ = __aenter__
+    type(async_lock_context).__aexit__ = __aexit__
 
     @memoize
     async def foo() -> None:
@@ -451,9 +457,15 @@ async def foo() -> None:
 
 def test_sync_does_not_async_lock(async_lock: MagicMock) -> None:
     async_lock_context = async_lock.return_value = MagicMock()
-    type(async_lock_context).__aenter__ = \
-        coroutine(lambda *args, **kwargs: async_lock_context)
-    type(async_lock_context).__aexit__ = coroutine(lambda *args, **kwargs: None)
+
+    async def __aenter__(*args, **kwargs):
+        return async_lock_context
+
+    async def __aexit__(*args, **kwargs):
+        ...
+
+    type(async_lock_context).__aenter__ = __aenter__
+    type(async_lock_context).__aexit__ = __aexit__
 
     @memoize
     def foo() -> None:

test/test_rate_decorator.py

@@ -1,5 +1,5 @@
 import asyncio
-from asyncio import coroutine, Event as AsyncEvent, gather
+from asyncio import Event as AsyncEvent, gather
 from atools import rate
 from concurrent.futures import ThreadPoolExecutor
 import pytest
@@ -97,12 +97,14 @@ def foo():
 async def test_duration_causes_async_waiter_to_sleep(
         async_sleep: MagicMock, time: MagicMock
 ) -> None:
-    async_sleep.side_effect = coroutine(lambda *_: None)
+    async def foo(*_):
+        ...
+    async_sleep.side_effect = foo
 
     @rate(size=1, duration=10)
-    async def foo():
+    async def bar():
         ...
 
-    await gather(foo(), foo())
+    await gather(bar(), bar())
 
     async_sleep.assert_called_once_with(10)