6、单元测试:JUnit
大约 2 分钟
在之前的测试方法中,几乎都能看到以下的两行代码:
ApplicationContext context = new ClassPathXmlApplicationContext("xxx.xml");
Xxxx xxx = context.getBean(Xxxx.class);
这两行代码的作用是创建Spring容器,最终获取到对象,但是每次测试都需要重复编写。针对上述问题,我们需要的是程序能自动帮我们创建容器。我们都知道JUnit无法知晓我们是否使用了 Spring 框架,更不用说帮我们创建 Spring 容器了。Spring提供了一个运行器,可以读取配置文件(或注解)来创建容器。我们只需要告诉它配置文件位置就可以了。这样一来,我们通过Spring整合JUnit可以使程序创建spring容器了
6.1、整合JUnit5
6.1.1、搭建子模块
搭建spring-junit模块
6.1.2、引入依赖
<dependencies>
<!--spring context依赖-->
<!--当你引入Spring Context依赖之后,表示将Spring的基础依赖引入了-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>6.0.2</version>
</dependency>
<!--spring对junit的支持相关依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>6.0.2</version>
</dependency>
<!--junit5测试-->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.9.0</version>
</dependency>
<!--log4j2的依赖-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.19.0</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j2-impl</artifactId>
<version>2.19.0</version>
</dependency>
</dependencies>
6.1.3、添加配置文件
beans.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.javaxiaobear.spring6.bean"/>
</beans>
copy日志文件:log4j2.xml
6.1.4、添加java类
package com.javaxiaobear.spring6.bean;
import org.springframework.stereotype.Component;
@Component
public class User {
public User() {
System.out.println("run user");
}
}
6.1.5、测试
import com.javaxiaobear.spring6.bean.User;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
//两种方式均可
//方式一
//@ExtendWith(SpringExtension.class)
//@ContextConfiguration("classpath:beans.xml")
//方式二
@SpringJUnitConfig(locations = "classpath:beans.xml")
public class SpringJUnit5Test {
@Autowired
private User user;
@Test
public void testUser(){
System.out.println(user);
}
}
6.2、整合JUnit4
JUnit4在公司也会经常用到,在此也学习一下
6.2.1、添加依赖
<!-- junit测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
6.2.2、测试
import com.javaxiaobear.spring6.bean.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:beans.xml")
public class SpringJUnit4Test {
@Autowired
private User user;
@Test
public void testUser(){
System.out.println(user);
}
}