完善测试

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@822 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/test/java/com/alibaba/druid/bvt/pool/basic/ConnectionTest4.java

@@ -397,6 +397,12 @@ public class ConnectionTest4 extends TestCase {
             stmt.close();
         }
 
+        conn.getConnectionHolder().toString();
+        conn.getConnectionHolder().setLastActiveTimeMillis(0);
+        conn.getConnectionHolder().toString();
+        conn.getConnectionHolder().getUseCount();
+        conn.getConnectionHolder().getTimeMillis();
+        
         conn.close();
     }