Eclipse中Junit的使用

      以下以银行余额、存款、取款为例

一、Junit配置

      Junit同Eclipse一同提供，无需下载。要使用Junit必须先将Junit jar 保存在项目的build路径上，并创建一个测试类，步骤如下：

1）法一：

      法二：点击项目test001，右键-propreties

2）选择Libraries，点击Add variable按钮，输入变量名JUNIT_LIB，路径：E:\测试\测试工具\Juint\eclipse\eclipse-jee-kepler-SR2-win32\eclipse\plugins\org.junit_4.11.0.v201303080030，结果如下图：

二、编写测试类和代码、执行测试用例

1）新建测试类：New-Junit Test Case

2）编写测试代码：

package testsample;

import org.junit.After;
import org.junit.Before;
import junit.framework.TestCase;
public class Tc_Account extends TestCase {

    public Tc_Account(String arg0)
    {
        super(arg0);
    }
    @Before
    public void setUp() throws Exception {
        super.setUp() ;
    }
    public void testDeposit(){
        Account account=new Account();
        assertEquals("Account should start with no funds.",1,account.balance());
        
        account.deposit(5);
        assertEquals("Account should reflect deposit.", 7, account.balance());
    }

    public void testwithdraw(){
        Account account=new Account();
        account.deposit(5);
        account.withdraw(3);
        assertEquals("Account should reflect withdarw.", 3, account.balance());
    }
    
    @After
    public void tearDown() throws Exception {
        super.tearDown();
    }
}

3）新建Acoount类，实现银行的余额、存款、取款：

package testsample;

public class Account {
    protected int balance;
    public int balance(){
        return balance;        
    }
    public void deposit(int amount){
        balance+=amount;
    }
    public void withdraw(int amount){
        balance-=amount;
    }
}

4）执行测试用例：右键项目testsample-Run as-Junit Test Case，通过failure trace可以查看错误信息

5）调整测试用例中的预期值：

package testsample;

import org.junit.After;
import org.junit.Before;
import junit.framework.TestCase;
public class Tc_Account extends TestCase {

    public Tc_Account(String arg0)
    {
        super(arg0);
    }
    @Before
    public void setUp() throws Exception {
        super.setUp() ;
    }
    public void testDeposit(){
        Account account=new Account();
        assertEquals("Account should start with no funds.",0,account.balance());
        
        account.deposit(5);
        assertEquals("Account should reflect deposit.", 5, account.balance());
    }

    public void testwithdraw(){
        Account account=new Account();
        account.deposit(5);
        account.withdraw(3);
        assertEquals("Account should reflect withdarw.", 2, account.balance());
    }
    
    @After
    public void tearDown() throws Exception {
        super.tearDown();
    }
}

6）执行测试用例，结果如下：所有测试通过