本文主要向大家介绍了JAVA语言之第3章：Maven使用入门/3.3 编写测试代码，通过具体的内容向大家展示，希望对大家学习JAVA语言有所帮助。

编写测试代码

在约定src/test/java下新建测试代码类

`package com.wys.myapp.helloworld;

import org.junit.Test;
import static org.junit.Assert.*;

public class HelloWorldErrTest {

@Test
public void SayHello(){
HelloWorld helloWorld = new HelloWorld();
String restult = helloWorld.SayHello();
assertEquals("hello world123",restult);
}
}`

`package com.wys.myapp.helloworld;

import org.junit.Test;
import static org.junit.Assert.*;

public class HelloWorldTest {

@Test
public void SayHello(){
HelloWorld helloWorld = new HelloWorld();
String restult = helloWorld.SayHello();
assertEquals("hello world",restult);
}
}`

执行mvn clean test：会自动执行src/test/java下面所有的main方法完成测试案例执行，如果有报错则抛出异常并且终止测试
[D:\MavenTest\HelloWord]$ mvn clean test
[INFO] Scanning for projects...

T E S T S

Running com.wys.myapp.helloworld.HelloWorldTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.062 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.225 s
[INFO] Finished at: 2018-08-02T14:29:58+08:00
[INFO] Final Memory: 16M/180M
[INFO] ------------------------------------------------------------------------
[D:\MavenTest\HelloWord]$

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