add jmx export testcase

src/test/java/com/alibaba/druid/bvt/jmx/JMXExporterTest.java

@@ -0,0 +1,29 @@
+package com.alibaba.druid.bvt.jmx;
+
+import java.lang.management.ManagementFactory;
+
+import javax.management.ObjectName;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class JMXExporterTest extends TestCase {
+
+    public void test_export() throws Exception {
+        String file = "com/alibaba/druid/jmx/spring_stat_export.xml";
+
+        ObjectName objectName = new ObjectName("com.alibaba.druid:type=JdbcStatManager");
+
+        Assert.assertFalse(ManagementFactory.getPlatformMBeanServer().isRegistered(objectName)); // before jmx register
+
+        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(file);
+
+        Assert.assertTrue(ManagementFactory.getPlatformMBeanServer().isRegistered(objectName)); // after jmx register
+
+        context.close();
+
+        Assert.assertFalse(ManagementFactory.getPlatformMBeanServer().isRegistered(objectName));
+    }
+}