<dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>4.13</version>
  <!--請注意這個(gè)scope的用法-->
  <scope>test</scope>
</dependency>

<dependency>
  <groupId>org.junit.jupiter</groupId>
  <artifactId>junit-jupiter</artifactId>
  <version>5.6.2</version>
  <!--請注意這個(gè)scope的用法-->
  <scope>test</scope>
</dependency>

public class TestDemo {  
    @Test
    void fun1(){
        System.out.println("歡迎關(guān)注我的微信公眾號——小魚與Java");
    }
}

Junit4: org.junit.Test
Junit5: org.junit.jupiter.api.Test

/**
 * 使用普通的Spring上下文來加載Spring容器
 * 
 * @auther 微信公眾號：小魚與Java
 * 2020/4/23
 */
public class MyMain {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("application.xml");
        Teacher teacher = (Teacher) ctx.getBean("teacher");
        System.out.println(teacher.getName());
    }
}

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>5.2.5.RELEASE</version>
</dependency>

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:application.xml"})
public class TestDemo {
    @Resource
    private Teacher teacher;
    @Test
    public void fun(){
        System.out.println(teacher.getName());
    }
}

@SpringJUnitConfig
//指定配置文件路徑，會(huì)先從test域中找
@ContextConfiguration("classpath:application.xml")
public class SpringTest {
    @Resource
    private Teacher teacher;
    @Test
    void fun(){
        System.out.println(teacher.getName());
    }
}

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <version>2.1.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>2.1.6.RELEASE</version>
    <!--表示只能在maven的測試域中使用-->
    <scope>test</scope>
  </dependency>
</dependencies>

@SpringBootTest
@RunWith(SpringJUnit4ClassRunner.class)
public class TestDemo {
   @Resource
   private Student student;
   @Test
   public void fun1(){
        System.out.println(student.getName());
    }
}

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <version>2.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>2.2.6.RELEASE</version>
    <!--表示只能在maven的測試域中使用-->
    <scope>test</scope>
    <exclusions>
      <!--這個(gè)是JUnit5中為了支持使用JUint4所做的一個(gè)過度
       也就是說，你只需要在你的JUnit4舊項(xiàng)目中添加這個(gè)依賴，
       就能完美過渡，而不用修改之前代碼
       這里用不到，自然也就排除了。當(dāng)然，這里，它無關(guān)緊要
   -->
      <exclusion>
        <groupId>org.junit.vintage</groupId>
        <artifactId>junit-vintage-engine</artifactId>
      </exclusion>
    </exclusions>
  </dependency>
</dependencies>

@SpringBootTest //它默認(rèn)會(huì)為我們加載Spring容器，
public class TestDemo {
    @Resource
    private Student student;
    @Test
    void fun1(){
        System.out.println(student.getName());
    }
}