fix: Use asyncio.new_event_loop() to create event loop for tests (#1138)

* fix: Use `asyncio.new_event_loop()` to create event loop for tests

Replace the use of `asyncio.get_event_loop()` with more appropriate
`asyncio.new_event_loop()` to create event loops for testing.
The former used to be a wrapper that either returned the currently
running event loop or created a new one, but the latter behavior was
deprecated and removed in Python 3.14.  Since the tests are always run
in a synchronous context, and they always run the obtained event loop
to completion, just always create a new event loop.

Fixes #1137

Signed-off-by: Michał Górny <[email protected]>

* fix: Remove obsolete asgiref pin

Remove the `asgiref` pin linked to #1020.  I can't reproduce the issue
anymore with the current `asgiref` versions, and the pin actually
breaks the tests with the `asyncio` event loop fixes.

Signed-off-by: Michał Górny <[email protected]>

---------

Signed-off-by: Michał Górny <[email protected]>

Author: mgorny

tests/test_asgi.py

@@ -45,23 +45,23 @@ def setUp(self):
 
     def tearDown(self):
         if self.communicator:
-            asyncio.get_event_loop().run_until_complete(
+            asyncio.new_event_loop().run_until_complete(
                 self.communicator.wait()
             )
 
     def seed_app(self, app):
         self.communicator = ApplicationCommunicator(app, self.scope)
 
     def send_input(self, payload):
-        asyncio.get_event_loop().run_until_complete(
+        asyncio.new_event_loop().run_until_complete(
             self.communicator.send_input(payload)
         )
 
     def send_default_request(self):
         self.send_input({"type": "http.request", "body": b""})
 
     def get_output(self):
-        output = asyncio.get_event_loop().run_until_complete(
+        output = asyncio.new_event_loop().run_until_complete(
             self.communicator.receive_output(0)
         )
         return output
@@ -229,6 +229,6 @@ def test_qs_parsing(self):
 
                 self.assert_not_metrics(output, *metrics[i_2])
 
-            asyncio.get_event_loop().run_until_complete(
+            asyncio.new_event_loop().run_until_complete(
                 self.communicator.wait()
             )

tox.ini

@@ -8,9 +8,6 @@ deps =
     pytest-benchmark
     attrs
     {py3.9,pypy3.9}: twisted
-    # NOTE: Pinned due to https://github.com/prometheus/client_python/issues/1020
-    py3.9: asgiref==3.7
-    pypy3.9: asgiref==3.7
 commands = coverage run --parallel -m pytest {posargs}
 
 [testenv:py3.9-nooptionals]