wrap db before host dir is gone in new test

IPython/core/tests/test_history.py

@@ -240,7 +240,9 b' def test_get_tail_session_awareness():'
         tmp_path = Path(tmpdir)
         hist_file = tmp_path / "history.sqlite"
         get_source = lambda x: x[2]
-
+        hm1 = None
+        hm2 = None
+        try:
         # hm1 creates a new session and adds history entries,
         # ha catches up
         hm1 = HistoryManager(shell=ip, hist_file=hist_file)
@@ -293,3 +295,11 b' def test_get_tail_session_awareness():'
         assert hm1_last_sid() == sid1
         assert hm2_last_sid() == sid2
         assert ha_last_sid() == sid2
+        finally:
+            if hm1:
+                hm1.save_thread.stop()
+            if hm2:
+                hm2.save_thread.stop()
+            hm = hm1 or hm2
+            if hm:
+                hm.db.close()