[TD-3960] <test> add case for TD-3960

tests/pytest/fulltest.sh

@@ -305,6 +305,7 @@ python3 ./test.py -f functions/function_top.py -r 1
 python3 ./test.py -f functions/function_twa.py -r 1
 python3 ./test.py -f functions/function_twa_test2.py
 python3 ./test.py -f functions/function_stddev_td2555.py
+python3 ./test.py -f functions/showOfflineThresholdIs864000.py
 python3 ./test.py -f insert/metadataUpdate.py
 python3 ./test.py -f query/last_cache.py
 python3 ./test.py -f query/last_row_cache.py

tests/pytest/functions/showOfflineThresholdIs864000.py

+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug(f"start to execute {__file__}")
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.query("show variables")
+        tdSql.checkData(51, 1, 864000)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
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