这是一个WebProject，但不需配置web.xml，因为EasyMock用不上它

首先是用到的实体类User.java

package com.jadyer.model;

public class User {

	private int id;

	private String username;

	private String password;

	/*-- 三个属性的setter和getter略 --*/

	public User(){}

	public User(int id, String username, String password) {

		this.id = id;

		this.username = username;

		this.password = password;

	}

}

下面是待测试的LoginServlet.java

package com.jadyer.servlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import com.jadyer.model.User;

public class LoginServlet extends HttpServlet {

	private static final long serialVersionUID = 6655227641354075528L;

	public boolean isLogin(HttpServletRequest request){

		HttpSession session = request.getSession();

		if(null == session){

			return false;

		}

		User user = (User)session.getAttribute("loginUser");

		if(null == user){

			return false;

		}

		return true;

	}

}

最后是使用EasyMock编写的测试用例LoginServletTest.java

package com.jadyer.servlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import org.easymock.EasyMock;

import org.junit.Assert;

import org.junit.Before;

import org.junit.Test;

import com.jadyer.model.User;

/**

 * EasyMock框架在使用时只需要一个easymock-3.1.jar

 * 下载地址为http://sourceforge.net/projects/easymock/files/

 * @create Jul 9, 2013 2:28:41 PM

 * @author 玄玉

 */

public class LoginServletTest {

	private LoginServlet servlet;

	private HttpServletRequest request;

	private HttpSession session;

	@Before

	public void init(){

		servlet = new LoginServlet();

		request = EasyMock.createStrictMock(HttpServletRequest.class);

		session = EasyMock.createStrictMock(HttpSession.class);

	}

	/**

	 * 测试登录失败的情况(session为空)

	 */

	@Test

	public void testIsLoginFailSessionIsNull(){

		//声明HttpServletRequest获取到的HttpSession是空的

		EasyMock.expect(request.getSession()).andReturn(null);

		EasyMock.replay(request, session);

		//验证HttpSession为空时登录应该是失败的

		Assert.assertFalse(servlet.isLogin(request));

		EasyMock.verify(request, session);

	}

	/**

	 * 测试登录失败的情况(session中无用户)

	 */

	@Test

	public void testIsLoginFailSessionNoUser(){

		//声明HttpServletRequest获取到的是正常的HttpSession

		EasyMock.expect(request.getSession()).andReturn(session);

		//声明HttpSession中无用户

		EasyMock.expect(session.getAttribute("loginUser")).andReturn(null);

		EasyMock.replay(request, session);

		//验证HttpSession中无用户时登录应该是失败的

		Assert.assertFalse(servlet.isLogin(request));

		EasyMock.verify(request, session);

	}

	/**

	 * 测试登录成功的情况

	 */

	@Test

	public void testIsLoginSuccess(){

		//声明HttpServletRequest获取到的是正常的HttpSession

		EasyMock.expect(request.getSession()).andReturn(session);

		//声明HttpSession中存在用户

		EasyMock.expect(session.getAttribute("loginUser")).andReturn(new User());

		EasyMock.replay(request, session);

		//验证HttpSession有效且存在用户时登录应该是成功的

		Assert.assertTrue(servlet.isLogin(request));

		EasyMock.verify(request, session);

	}

}