junit4 - writing Junit test case for DAO -

i'm new using mybatis3 developing web application. have dao impl class , related mapper.xml . want write junit case dao.if able me, extremely grateful.

here's have:

customer-mapper.xml

<?xml version="1.0" encoding="utf-8"?> <!doctype mapper     public "-//mybatis.org//dtd mapper 3.0//en"     "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="customer">     <insert id="newcustomer" parametertype="com.yell.hibu.domain.customer">         insert customer(customer_id, name, email_id,graphic_name,mobile,dob,language,city,country) values(#{customerid},#{customername},#{emailid},#{userfilefilename},#{mobileno},#{dob},#{language},#{city},#{country})     </insert>      <select id="selectcustomer" resultmap="customer">           select * customer customer_id = #{customerid};         </select>               <resultmap type="com.yell.hibu.domain.customer" id="customer">              <result property="customerid" column="customer_id" />                  <result property="customername" column="name" />                  <result property="emailid" column="email_id" />                  <result property="userfilefilename" column="graphic_name" />                  <result property="mobileno" column="mobile" />                  <result property="dob" column="dob" />                  <result property="language" column="language" />                  <result property="city" column="city" />                  <result property="country" column="country" />          </resultmap> </mapper> 

daoimpl.java

package com.yell.hibu.dao;  import org.apache.log4j.logger; import org.mybatis.spring.support.sqlsessiondaosupport;  import com.yell.hibu.domain.customer;      public class customerdaoimpl extends sqlsessiondaosupport implements customerdao{          private final logger logger= logger.getlogger(this.getclass());          public void insertcustomer(customer customer) {             logger.info("entered customerdaoimpl :: insertcustomer()");             getsqlsession().insert("customer.newcustomer", customer);             logger.info("leaving customerdaoimpl :: insertcustomer()");          }      } 

since use easymock, mock sessionfactory instance returns mocked session object, or throws exception.

@test(expectedexceptions = exception.class) public void testfailuretoconnect() throws exception {      iocsessionfactory = easymock.createmock(sqlsessionfactory.class);     oracledaoimpl.setiocoraclesessionfactory(iocsessionfactory);     easymock.expect(iocsessionfactory.opensession()).andthrow(new runtimeexception("connection error"));     easymock.replay(iocsessionfactory);      oracledaoimpl.getdata(); } 

or if don't want mock everything, check out https://code.google.com/p/mybatis/wiki/test