add testcase

src/main/java/com/alibaba/druid/filter/stat/StatFilter.java

@@ -96,6 +96,10 @@ public class StatFilter extends FilterEventAdapter implements StatFilterMBean {
         this.dbType = dbType;
     }
 
+    public long getSlowSqlMillis() {
+        return slowSqlMillis;
+    }
+
     public boolean isConnectionStackTraceEnable() {
         return connectionStackTraceEnable;
     }
@@ -406,7 +410,8 @@ public class StatFilter extends FilterEventAdapter implements StatFilterMBean {
         }
     }
 
-    private final void internalAfterStatementExecute(StatementProxy statement, boolean firstResult, int... updateCountArray) {
+    private final void internalAfterStatementExecute(StatementProxy statement, boolean firstResult,
+                                                     int... updateCountArray) {
 
         final JdbcStatementStat.Entry entry = getStatementInfo(statement);
 

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

@@ -0,0 +1,32 @@
+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 SlowSqlMillisTest extends TestCase {
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:wrap-jdbc:jdbc:mock:xxx");
+        dataSource.setTestOnBorrow(false);
+        dataSource.setTestOnReturn(false);
+        dataSource.setTestWhileIdle(false);
+        dataSource.setConnectionProperties("druid.stat.slowSqlMillis=500");
+        dataSource.setFilters("stat");
+        dataSource.init();
+    }
+
+    protected void tearDown() throws Exception {
+        dataSource.close();
+    }
+
+    public void test_connect() throws Exception {
+        StatFilter filter = (StatFilter) dataSource.getProxyFilters().get(0);
+        Assert.assertEquals(500, filter.getSlowSqlMillis());
+    }
+}