add testcase

src/test/java/com/alibaba/druid/bvt/pool/SlowSqlMillisTest.java

@@ -12,7 +12,7 @@ public class SlowSqlMillisTest extends TestCase {
 
     protected void setUp() throws Exception {
         dataSource = new DruidDataSource();
-        dataSource.setUrl("jdbc:wrap-jdbc:jdbc:mock:xxx");
+        dataSource.setUrl("jdbc:mock:xxx");
         dataSource.setTestOnBorrow(false);
         dataSource.setTestOnReturn(false);
         dataSource.setTestWhileIdle(false);

src/test/java/com/alibaba/druid/bvt/pool/SlowSqlMillisTest2.java

@@ -0,0 +1,38 @@
+package com.alibaba.druid.bvt.pool;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.filter.stat.StatFilter;
+import com.alibaba.druid.pool.DruidDataSource;
+
+
+public class SlowSqlMillisTest2 extends TestCase {
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setTestOnBorrow(false);
+        dataSource.setTestOnReturn(false);
+        dataSource.setTestWhileIdle(false);
+        System.setProperty("druid.stat.slowSqlMillis", "500");
+        dataSource.setFilters("stat");
+        
+        {
+            StatFilter filter = (StatFilter) dataSource.getProxyFilters().get(0);
+            Assert.assertEquals(3000, filter.getSlowSqlMillis());
+        }
+        dataSource.init();
+    }
+
+    protected void tearDown() throws Exception {
+        System.clearProperty("druid.stat.slowSqlMillis");
+        dataSource.close();
+    }
+
+    public void test_connect() throws Exception {
+        StatFilter filter = (StatFilter) dataSource.getProxyFilters().get(0);
+        Assert.assertEquals(500, filter.getSlowSqlMillis());
+    }
+}