Migrate conftest.py to pytest-asyncio 1.x

The session-scoped event_loop fixture override is no longer honored
in pytest-asyncio 1.x. Replace it with `asyncio_default_fixture_loop_scope`
and `asyncio_default_test_loop_scope` set to session in pytest.ini, and
convert async_sandbox_factory to an async fixture that yields and awaits
sandbox cleanup directly instead of calling run_until_complete from a
sync finalizer.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: mishushakov

python/pytest.ini

@@ -2,6 +2,8 @@
 [pytest]
 markers =
     skip_debug: skip test if E2B_DEBUG is set.
-asyncio_mode=auto
+asyncio_mode = auto
+asyncio_default_fixture_loop_scope = session
+asyncio_default_test_loop_scope = session
 
 addopts = "--import-mode=importlib" "--numprocesses=2"

python/tests/conftest.py

@@ -1,4 +1,3 @@
-import asyncio
 import os
 
 import pytest
@@ -43,39 +42,24 @@ def sandbox(sandbox_factory):
     return sandbox_factory()
 
 
-# override the event loop so it never closes
-# this helps us with the global-scoped async http transport
-@pytest.fixture(scope="session")
-def event_loop():
-    try:
-        loop = asyncio.get_running_loop()
-    except RuntimeError:
-        loop = asyncio.new_event_loop()
-    yield loop
-    loop.close()
-
-
 @pytest.fixture
-def async_sandbox_factory(request, template, sandbox_test_id, event_loop):
+async def async_sandbox_factory(template, sandbox_test_id):
+    sandboxes: list[AsyncSandbox] = []
+
     async def factory(*, template_name: str = template, **kwargs):
         kwargs.setdefault("timeout", 60)
 
         metadata = kwargs.setdefault("metadata", dict())
         metadata.setdefault("sandbox_test_id", sandbox_test_id)
 
         sandbox = await AsyncSandbox.create(template_name, **kwargs)
-
-        def kill():
-            async def _kill():
-                await sandbox.kill()
-
-            event_loop.run_until_complete(_kill())
-
-        request.addfinalizer(kill)
-
+        sandboxes.append(sandbox)
         return sandbox
 
-    return factory
+    yield factory
+
+    for sandbox in sandboxes:
+        await sandbox.kill()
 
 
 @pytest.fixture