add testcase & bug fixed

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

@@ -0,0 +1,39 @@
+package com.alibaba.druid.bvt.pool;
+
+import java.sql.Connection;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.pool.DruidDataSource;
+
+public class DruidDataSourceTest extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setTestOnBorrow(false);
+
+        dataSource.init();
+    }
+
+    protected void tearDown() throws Exception {
+        dataSource.close();
+    }
+    
+    public void test_getInitStackTrace() {
+        String stackTrace = dataSource.getInitStackTrace();
+        Assert.assertTrue(stackTrace.indexOf("com.alibaba.druid.bvt.pool.DruidDataSourceTest.setUp") != -1);
+    }
+    
+    public void test_restart() throws Exception {
+        Assert.assertEquals(true, dataSource.isInited());
+        dataSource.restart();
+        Assert.assertEquals(false, dataSource.isInited());
+        
+        Connection conn = dataSource.getConnection();
+        conn.close();
+    }
+}