Erro quanto eu Testo minha aplicação JUnit (corrigido)

package br.com.devmedia.completeswingapp.dao;

import java.sql.ResultSet;
import java.sql.SQLException;

import br.com.devmedia.completeswingapp.entity.User;

public class UserDAO extends GenericDAO {
	
	public int addUser(User usr) throws SQLException{
		usr.setId(getNextId("users"));
		String query = "insert into users (id, name, login, password) values (?, ?, ?, ?)";
		executeCommand(query,usr.getId(), usr.getName(), usr.getLogin(), usr.getPassword());
		return usr.getId();
	}
	
	public void removeUser(int idUser) throws SQLException{
		executeCommand("delete from users where id = ?", idUser);
	}
	
	public void updateUser(User usr) throws SQLException{
		String query = "update users set name =?, login =?, password =? where id =?";
		executeCommand(query,usr.getName(), usr.getLogin(), usr.getPassword(), usr.getId());
	}
	
	public User getUser(int idUser) throws SQLException{
		ResultSet rs = executeQuery("select * from users where id =?", idUser);
		User usr = null;
		if(rs.next()){
			usr = populateUserInfo(rs);
		}
		rs.close();
		return usr;
	}

	private static User populateUserInfo(ResultSet rs) throws SQLException {
		User toReturn = new User();
		toReturn.setId(rs.getInt("id"));
		toReturn.setLogin(rs.getString("login"));
		toReturn.setName(rs.getString("name"));
		toReturn.setPassword(rs.getString("password"));
		return toReturn;
	}
}

/**
 * 
 */
package br.com.devmedia.completeswingapp.dao;

import static org.junit.Assert.*;

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

import br.com.devmedia.completeswingapp.entity.User;

/**
 * @author Renato
 *
 */
public class UserDAOTest {

	public static Integer idOfUser =0;
	/**
	 * @throws java.lang.Exception
	 */
	@BeforeClass
	public static void setUpClass() throws Exception {
	}

	/**
	 * @throws java.lang.Exception
	 */
	@AfterClass
	public static void tearDownClass() throws Exception {
	}

	/**
	 * @throws java.lang.Exception
	 */
	@Before
	public void setUp() throws Exception {
	}

	/**
	 * @throws java.lang.Exception
	 */
	@After
	public void tearDown() throws Exception {
	}
	/**
	 * Test method for {@link br.com.devmedia.completeswingapp.dao.UserDAO#addUser(br.com.devmedia.completeswingapp.entity.User)}.
	 */
	@Test
	public void testAddUser() throws Exception {
		System.out.println("addUser");
		User usr = new User();
		usr.setName("Test User");
		usr.setLogin("test");
		usr.setPassword("test123");
		UserDAO instance = new UserDAO();
		idOfUser = instance.addUser(usr);
		User result = instance.getUser(idOfUser);
		assertEquals(idOfUser, result.getId());
	
	}
	
	/**
	 * Test method for {@link br.com.devmedia.completeswingapp.dao.UserDAO#getUser(int)}.
	 */
	@Test
	public void testGetUser()  throws Exception{
		System.out.println("getUser");
		int idUser = idOfUser;
		UserDAO instance = new UserDAO();
		Integer expResult = idOfUser;
		User result = instance.getUser(idUser);
		assertEquals(expResult, result.getId());
	}
	

	/**
	 * Test method for {@link br.com.devmedia.completeswingapp.dao.UserDAO#updateUser(br.com.devmedia.completeswingapp.entity.User)}.
	 */
	@Test
	public void testUpdateUser() throws Exception{
		System.out.println("updateUser");
		UserDAO instance = new UserDAO();
		User usr = instance.getUser(idOfUser);
		usr.setName("Test Test NOW");
		instance.updateUser(usr);
		usr = instance.getUser(idOfUser);
		assertEquals(usr.getName(), "Test Test NOW");
	}



	/**
	 * Test method for {@link br.com.devmedia.completeswingapp.dao.UserDAO#removeUser(int)}.
	 */
	@Test
	public void testRemoveUser() throws Exception{
		System.out.println("removeUser");
		UserDAO instance = new UserDAO();
		instance.removeUser(idOfUser);
	}


	

}