写了个Servlet的测试用例，初学单元测试，大家帮我看看。

用的JUnit是4.4版，EasyMock2.3。

这是Servlet：

package net.javayuan.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @(#)LoginServlet.java 2008-6-4 下午11:39:05
 * 
 * @author Yuan
 * LoginServlet
 */
public class LoginServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = -7068817837964223972L;

	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response)
	throws IOException,ServletException{
		String username = request.getParameter("username").trim();
		String password = request.getParameter("password");
		if ("yuan".equals(username) && "123456".equals(password))
			response.sendRedirect("welcome.jsp");
		else
			response.sendRedirect("error.jsp");
	}
}

这是Test Case：

package net.javayuan.servlet;

import static org.easymock.EasyMock.*;

import java.io.IOException;

import org.junit.Test;
import org.junit.After;
import org.junit.Before;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @(#)LoginServlet.java 2008-6-5 上午09:19:42
 * 
 * @author Yuan
 * LoginServlet Test Case
 */
public class LoginServletTest {

	private LoginServlet servlet;
	private HttpServletRequest mockRequest;
	private HttpServletResponse mockResponse;
	
	@Before
	public void setUp(){
		
		servlet = new LoginServlet();
		
		//创建request和response的Mock
		mockRequest = createMock(HttpServletRequest.class);
		mockResponse = createMock(HttpServletResponse.class);
	}
	
	@After
	public void tearDown(){
		
		//为了验证指定的调用行为确实发生了，要调用verify(mock)进行验证。
		verify(mockRequest);
		verify(mockResponse);
	}

	/**
	 * 测试doPost方法
	 * @throws IOException
	 * @throws ServletException
	 * */
	@Test
	public void testDoPost() throws IOException, ServletException{
		
		//录制request和response的动作
		mockRequest.getParameter("username");
		expectLastCall().andReturn("yuan");//设置前一方法被调用时的返回值
		
		mockRequest.getParameter("password");
		expectLastCall().andReturn("123456");
		
		mockResponse.sendRedirect("welcome.jsp");
		
		//回放
		replay(mockRequest);
		replay(mockResponse);
		
		//开始测试Servlet的doPost方法
		servlet.doPost(mockRequest, mockResponse);
	}
	
}

不知道测试重定向的页面是不是这么测，我想应该是的。

今天重新写了一遍测试代码，Servlet代码不变：

package net.javayuan.servlet;

import static org.easymock.EasyMock.*;

import java.io.IOException;

import org.junit.Test;
import org.junit.After;
import org.junit.Before;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @(#)LoginServlet.java 2008-6-5 上午09:19:42
 * 
 * @author Yuan
 * LoginServlet Test Case
 */
public class LoginServletTest {

	private LoginServlet servlet;
	private HttpServletRequest mockRequest;
	private HttpServletResponse mockResponse;
	
	@Before
	public void setUp(){
		
		servlet = new LoginServlet();
		
		//创建request和response的Mock
		mockRequest = createMock(HttpServletRequest.class);
		mockResponse = createMock(HttpServletResponse.class);
	}
	
	@After
	public void tearDown(){
		
		//为了验证指定的调用行为确实发生了，要调用verify(mock)进行验证。
		verify(mockRequest);
		verify(mockResponse);
	}

	/**
	 * 测试登录成功
	 * @throws IOException
	 * @throws ServletException
	 * */
	@Test
	public void testLoginSuccessful() throws IOException, ServletException{
		recordUsername("qq7338367");
		recordPassword("123456");
		
		mockResponse.sendRedirect("welcome.jsp");
		replayLogin();
	}
	
	/**
	 * 测试密码错误
	 * @throws IOException
	 * @throws ServletException
	 */
	@Test
	public void testWrongPassword() throws IOException, ServletException{
		recordUsername("qq7338367");
		recordPassword("******");
		
		mockResponse.sendRedirect("error.jsp");
		replayLogin();
	}
	
	/**
	 * 测试用户名不存在
	 * @throws IOException
	 * @throws ServletException
	 */
	@Test
	public void testUsernameNotExist() throws IOException, ServletException{
		recordUsername("yuan");
		recordPassword("123456");
		
		mockResponse.sendRedirect("error.jsp");
		replayLogin();
	}
	
	/**
	 * 录制用户名
	 * @param username 用户名
	 */
	private void recordUsername(String username){
		//录制request和response的动作
		mockRequest.getParameter("username");
		expectLastCall().andReturn(username);//设置前一方法被调用时的返回值
	}
	
	/**
	 * 录制密码
	 * @param password 密码
	 */
	private void recordPassword(String password){
		mockRequest.getParameter("password");
		expectLastCall().andReturn(password);
	}
	
	/**
	 * 回放
	 * @throws IOException
	 * @throws ServletException
	 */
	private void replayLogin() throws IOException, ServletException{

		//回放
		replay(mockRequest);
		replay(mockResponse);
		
		//开始测试Servlet的doPost方法
		servlet.doPost(mockRequest, mockResponse);
	}
}

还有哪里有待改进？希望大家能提提意见，谢谢了！

工作原理不太明白啊,没用过~~~