Java开发过程中，测试类究竟扮演着怎样的关键角色？

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javapackage dao.impl;

import java.util.List;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import org.apache.catalina.User;import bean.UserInfo;import bean.Users;import dao.IUserDao;

UserDaoImpl.java

package dao.impl; import java.util.List; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import org.apache.catalina.User; import bean.UserInfo; import bean.Users; import dao.IUserDao; import tools.DBTools; public class UserDaoImpl implements IUserDao{ @Override public Users getUserByNameAndPwd(String name, String pwd) { String sql="select users.name as users_name,users.pwd as users_pwd,users.id as users_id, users.roleid as users_roleid,roles.id as roles_id,roles.name as roles_name from users,roles where users.name=? and users.pwd=? and users.roleid=roles.id"; List