Fixed #22414 -- Ensured that LiveServerTestCase closes connections.

tests/servers/test_liveserverthread.py

@@ -0,0 +1,28 @@
+from django.db import DEFAULT_DB_ALIAS, connections
+from django.test import LiveServerTestCase, TestCase
+
+
+class LiveServerThreadTest(TestCase):
+
+    def run_live_server_thread(self, connections_override=None):
+        thread = LiveServerTestCase._create_server_thread(connections_override)
+        thread.daemon = True
+        thread.start()
+        thread.is_ready.wait()
+        thread.terminate()
+
+    def test_closes_connections(self):
+        conn = connections[DEFAULT_DB_ALIAS]
+        if conn.vendor == 'sqlite' and conn.is_in_memory_db():
+            self.skipTest("the sqlite backend's close() method is a no-op when using an in-memory database")
+        # Pass a connection to the thread to check they are being closed.
+        connections_override = {DEFAULT_DB_ALIAS: conn}
+
+        saved_sharing = conn.allow_thread_sharing
+        try:
+            conn.allow_thread_sharing = True
+            self.assertTrue(conn.is_usable())
+            self.run_live_server_thread(connections_override)
+            self.assertFalse(conn.is_usable())
+        finally:
+            conn.allow_thread_sharing = saved_sharing