Eclipse中Junit的使用

      以下以銀行余額、存款、取款為例

一、Junit配置

      Junit同Eclipse一同提供，無需下載。要使用Junit必須先將Junit jar 保存在項目的build路徑上，並創建一個測試類，步驟如下：

1）法一：

      法二：點擊項目test001，右鍵-propreties

2）選擇Libraries，點擊Add variable按鈕，輸入變量名JUNIT_LIB，路徑：E:\測試\測試工具\Juint\eclipse\eclipse-jee-kepler-SR2-win32\eclipse\plugins\org.junit_4.11.0.v201303080030，結果如下圖：

二、編寫測試類和代碼、執行測試用例

1）新建測試類：New-Junit Test Case

2）編寫測試代碼：

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類，實現銀行的余額、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）執行測試用例：右鍵項目testsample-Run as-Junit Test Case，通過failure trace可以查看錯誤信息

5）調整測試用例中的預期值：

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）執行測試用例，結果如下：所有測試通過