bpo-34728: Remove deprecate *loop* argument in asyncio.sleep (GH-9415)

* Insert the warn in the asyncio.sleep when the loop argument is used

* Insert the warn in the asyncio.wait and asyncio.wait_for when the loop argument is used

* Better format of the code

* Add news file

* change calls for get_event_loop() to calls for get_running_loop()

* Change message to be more clear in News

* Improve the comments in test_tasks

Lib/test/test_asyncio/test_tasks.py

@@ -3220,6 +3220,35 @@ class SleepTests(test_utils.TestCase):
         self.loop.run_until_complete(coro())
         self.assertEqual(result, 11)
 
+    def test_loop_argument_is_deprecated(self):
+        # Remove test when loop argument is removed in Python 4.0
+        with self.assertWarns(DeprecationWarning):
+            self.loop.run_until_complete(asyncio.sleep(0.01, loop=self.loop))
+
+
+class WaitTests(test_utils.TestCase):
+    def setUp(self):
+        super().setUp()
+        self.loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(None)
+
+    def tearDown(self):
+        self.loop.close()
+        self.loop = None
+        super().tearDown()
+
+    def test_loop_argument_is_deprecated_in_wait(self):
+        # Remove test when loop argument is removed in Python 4.0
+        with self.assertWarns(DeprecationWarning):
+            self.loop.run_until_complete(
+                asyncio.wait([coroutine_function()], loop=self.loop))
+
+    def test_loop_argument_is_deprecated_in_wait_for(self):
+        # Remove test when loop argument is removed in Python 4.0
+        with self.assertWarns(DeprecationWarning):
+            self.loop.run_until_complete(
+                asyncio.wait_for(coroutine_function(), 0.01, loop=self.loop))
+
 
 class CompatibilityTests(test_utils.TestCase):
     # Tests for checking a bridge between old-styled coroutines