diff --git a/src/test/java/com/alibaba/druid/bvt/proxy/filter/ClobTest.java b/src/test/java/com/alibaba/druid/bvt/proxy/filter/ClobTest.java
index 3199744799..5ea9ed15e5 100644
--- a/src/test/java/com/alibaba/druid/bvt/proxy/filter/ClobTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/proxy/filter/ClobTest.java
@@ -13,9 +13,16 @@ import junit.framework.TestCase;
 import org.junit.Assert;
 
 import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.stat.DruidDataSourceStatManager;
 
 public class ClobTest extends TestCase {
-
+    protected void setUp() throws Exception {
+        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
+    }
+    protected void tearDown() throws Exception {
+        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
+    }
+    
     public void test_clob() throws Exception {
         DruidDataSource dataSource = new DruidDataSource();
         dataSource.setFilters("stat");
@@ -59,5 +66,7 @@ public class ClobTest extends TestCase {
         rs.close();
         stmt.close();
         conn.close();
+        
+        dataSource.close();
     }
 }