From 958d2454dffdbc6a1b94f3ef144d80acf4fcdf0b Mon Sep 17 00:00:00 2001
From: Ping Xiao <pxiao@taosdata.com>
Date: Thu, 17 Jun 2021 17:29:25 +0800
Subject: [PATCH] [TD-4733]<test>: add test case for derivative function

---
 tests/pytest/functions/function_derivative.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tests/pytest/functions/function_derivative.py b/tests/pytest/functions/function_derivative.py
index 4ddb9c309b..9d60129672 100644
--- a/tests/pytest/functions/function_derivative.py
+++ b/tests/pytest/functions/function_derivative.py
@@ -128,7 +128,14 @@ class TDTestCase:
 
     def run(self):
         tdSql.prepare()        
-        self.insertAndCheckData()               
+        self.insertAndCheckData()
+
+        tdSql.execute("create table st(ts timestamp, c1 int, c2 int) tags(id int)")
+        tdSql.execute("insert into dev1(ts, c1) using st tags(1) values(now, 1)")
+
+        tdSql.error("select derivative(c1, 10s, 0) from (select c1 from st)")
+        tdSql.query("select diff(c1) from (select derivative(c1, 1s, 0) c1 from dev1)")
+        tdSql.checkRows(0)
               
     def stop(self):
         tdSql.close()
-- 
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