[3.0.x] Fixed #31253 -- Fixed data loss possibility when using caching from async code.

Case missed in a415ce70bef6d91036b00dd2c8544aed7aeeaaed.

Backport of e3f6e18513224c8ad081e5a19da641f49b0b43da from master

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/async/tests.py b/tests/async/tests.py
index f42e549075..86ed504c57 100644
--- a/tests/async/tests.py
+++ b/tests/async/tests.py
@@ -4,6 +4,7 @@ from unittest import mock, skipIf
 
 from asgiref.sync import async_to_sync
 
+from django.core.cache import DEFAULT_CACHE_ALIAS, caches
 from django.core.exceptions import SynchronousOnlyOperation
 from django.test import SimpleTestCase
 from django.utils.asyncio import async_unsafe
@@ -12,6 +13,18 @@ from .models import SimpleModel
 
 
 @skipIf(sys.platform == 'win32' and (3, 8, 0) < sys.version_info < (3, 8, 1), 'https://bugs.python.org/issue38563')
+class CacheTest(SimpleTestCase):
+    def test_caches_local(self):
+        @async_to_sync
+        async def async_cache():
+            return caches[DEFAULT_CACHE_ALIAS]
+
+        cache_1 = async_cache()
+        cache_2 = async_cache()
+        self.assertIs(cache_1, cache_2)
+
+
+@skipIf(sys.platform == 'win32' and (3, 8, 0) < sys.version_info < (3, 8, 1), 'https://bugs.python.org/issue38563')
 class DatabaseConnectionTest(SimpleTestCase):
     """A database connection cannot be used in an async context."""
     @async_to_sync