Junit3和Junit4测试包使用区别

在项目经常会用到单元测试，这里对Junit在开发中的使用标准及使用方法进行简单的介绍。

1.包目录的定义以及相关jar包的添加

2.Junit3和Junit4分别对测试类的编写

所测试的源代码：

[java]
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package com.techbirds; public class HelloWorld { public void sayHello(){ System.out.println("hello...."); throw new NumberFormatException(); } public void sayWorld(){ System.out.println("world...."); } public String say(){ return "hello world!"; } }

package com.techbirds;

public class HelloWorld {

public void sayHello(){
System.out.println("hello....");
throw new NumberFormatException();
}

public void sayWorld(){
System.out.println("world....");
}

public String say(){
return "hello world!";
}

}

Junit3测试类编写：

[java]
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package com.techbirds;

import junit.framework.TestCase;

public class HelloWorldTest extends TestCase{
private HelloWorld hw;

@Override
protected void setUp() throws Exception {
super.setUp();
hw=new HelloWorld();
}

//1.测试没有返回值
public void testHello(){
try {
hw.sayHello();
} catch (Exception e) {
System.out.println("发生异常.....");
}

}
public void testWorld(){
hw.sayWorld();
}
//2.测试有返回值的方法
// 返回字符串
public void testSay(){
assertEquals("测试失败", hw.say(), "hello world!");
}
//返回对象
public void testObj(){
assertNull("测试对象不为空", null);
assertNotNull("测试对象为空",new String());
}
@Override
protected void tearDown() throws Exception {
super.tearDown();
hw=null;
}
}

package com.techbirds;

import junit.framework.TestCase;

public class HelloWorldTest extends TestCase{
private HelloWorld hw;

@Override
protected void setUp() throws Exception {
super.setUp();
hw=new HelloWorld();
}

//1.测试没有返回值
public void testHello(){
try {
hw.sayHello();
} catch (Exception e) {
System.out.println("发生异常.....");
}

}
public void testWorld(){
hw.sayWorld();
}
//2.测试有返回值的方法
// 返回字符串
public void testSay(){
assertEquals("测试失败", hw.say(), "hello world!");
}
//返回对象
public void testObj(){
assertNull("测试对象不为空", null);
assertNotNull("测试对象为空",new String());
}
@Override
protected void tearDown() throws Exception {
super.tearDown();
hw=null;
}
}

Junit4测试类编写：

[java]
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package com.techbirds;

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

//导入Assert类的静态方法-为了便于junit4->junit3的转换

import static org.junit.Assert.*;

public class HelloWorldTest {
private HelloWorld hw;

@Before
public void setUp() {
hw = new HelloWorld();
}

@Test(expected=NumberFormatException.class)
// 1.测试没有返回值,有别于junit3的使用，更加方便

public void testHello() {
hw.sayHello();
}
@Test
public void testWorld() {
hw.sayWorld();
}

@Test
// 2.测试有返回值的方法
// 返回字符串
public void testSay() {
assertEquals("测试失败", hw.say(), "hello world!");
}

@Test
// 返回对象
public void testObj() {
assertNull("测试对象不为空", null);
assertNotNull("测试对象为空", new String());
}

@After
public void tearDown() throws Exception {
hw = null;
}

}

package com.techbirds;

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

//导入Assert类的静态方法-为了便于junit4->junit3的转换
import static org.junit.Assert.*;

public class HelloWorldTest {
private HelloWorld hw;

@Before
public void setUp() {
hw = new HelloWorld();
}

@Test(expected=NumberFormatException.class)
// 1.测试没有返回值,有别于junit3的使用，更加方便
public void testHello() {
hw.sayHello();
}
@Test
public void testWorld() {
hw.sayWorld();
}

@Test
// 2.测试有返回值的方法
// 返回字符串
public void testSay() {
assertEquals("测试失败", hw.say(), "hello world!");
}

@Test
// 返回对象
public void testObj() {
assertNull("测试对象不为空", null);
assertNotNull("测试对象为空", new String());
}

@After
public void tearDown() throws Exception {
hw = null;
}

}

全部测试类运行：