Eclipse中怎么使用junit测试

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：

1 package testsample; 2  3 import org.junit.After; 4 import org.junit.Before; 5 import junit.framework.TestCase; 6 public class Tc_Account extends TestCase { 7  8     public Tc_Account(String arg0) 9     {10         super(arg0);11     }12     @Before13     public void setUp() throws Exception {14         super.setUp() ;15     }16     public void testDeposit(){17         Account account=new Account();18         assertEquals("Account should start with no funds.",1,account.balance());19         20         account.deposit(5);21         assertEquals("Account should reflect deposit.", 7, account.balance());22     }23 24     public void testwithdraw(){25         Account account=new Account();26         account.deposit(5);27         account.withdraw(3);28         assertEquals("Account should reflect withdarw.", 3, account.balance());29     }30     31     @After32     public void tearDown() throws Exception {33         super.tearDown();34     }35 }

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3）新建Acoount类，实现银行的余额、存款、取款：

1 package testsample; 2  3 public class Account { 4     protected int balance; 5     public int balance(){ 6         return balance;
7     } 8     public void deposit(int amount){ 9         balance+=amount;10     }11     public void withdraw(int amount){12         balance-=amount;13     }14 }

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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：

1 package testsample; 2  3 import org.junit.After; 4 import org.junit.Before; 5 import junit.framework.TestCase; 6 public class Tc_Account extends TestCase { 7  8     public Tc_Account(String arg0) 9     {10         super(arg0);11     }12     @Before13     public void setUp() throws Exception {14         super.setUp() ;15     }16     public void testDeposit(){17         Account account=new Account();18         assertEquals("Account should start with no funds.",0,account.balance());19         20         account.deposit(5);21         assertEquals("Account should reflect deposit.", 5, account.balance());22     }23 24     public void testwithdraw(){25         Account account=new Account();26         account.deposit(5);27         account.withdraw(3);28         assertEquals("Account should reflect withdarw.", 2, account.balance());29     }30     31     @After32     public void tearDown() throws Exception {33         super.tearDown();34     }35 }

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6）执行测试用例，结果如下：所有测试通过