Junit 单元测试

--jar包依赖

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

参考博客：
--1、异常：Failed to load ApplicationContext
https://blog.csdn.net/guiqiaoai/article/details/80980425
--2、使用
https://blog.csdn.net/qq_35915384/article/details/80227297
--3、自动生成接口和测试类
https://jingyan.baidu.com/article/ab69b270d63f572ca6189f51.html