gh-105539: Fix ResourceWarning from unclosed SQLite connection in tests.

Follow up to 1a1bfc2.

Co-authored-by: Erlend E. Aasland <[email protected]>

Lib/test/test_sqlite3/test_backup.py

@@ -137,7 +137,7 @@ def progress(status, remaining, total):
             raise SystemError('nearly out of space')
 
         with self.assertRaises(SystemError) as err:
-            with sqlite.connect(':memory:') as bck:
+            with memory_database() as bck:
                 self.cx.backup(bck, progress=progress)
         self.assertEqual(str(err.exception), 'nearly out of space')
 

Lib/test/test_sqlite3/test_dbapi.py

@@ -40,6 +40,7 @@
 from test.support.os_helper import TESTFN, TESTFN_UNDECODABLE, unlink, temp_dir, FakePath
 
 from .util import memory_database, cx_limit
+from .util import MemoryDatabaseMixin
 
 
 class ModuleTests(unittest.TestCase):
@@ -1740,10 +1741,9 @@ def test_closed_call(self):
         self.check(self.con)
 
 
-class ClosedCurTests(unittest.TestCase):
+class ClosedCurTests(MemoryDatabaseMixin, unittest.TestCase):
     def test_closed(self):
-        con = sqlite.connect(":memory:")
-        cur = con.cursor()
+        cur = self.cx.cursor()
         cur.close()
 
         for method_name in ("execute", "executemany", "executescript", "fetchall", "fetchmany", "fetchone"):