import com.ruoyi.activity.ActivityApplication;
import com.ruoyi.activity.domain.Activity;
import com.ruoyi.activity.mapper.ActivityMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.ArrayList;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ActivityApplication.class)
@MapperScan(basePackages = "com.ruoyi.activity.mapper")
public class MapperTests {

    @Autowired
    private ActivityMapper activityMapper;

    @Test
    public void testSelectActivityById() {
        Activity activity = activityMapper.selectActivityById(1);
        System.out.println(activity);
    }

    @Test
    public void testSelectActivityList() {
        List<Activity> activityList = activityMapper.selectActivityList(new Activity());
        System.out.println(activityList);
    }

}

 <!-- Mysql 驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- 阿里数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>
<!-- SpringBoot Web 容器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 测试所需 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>

package com.ruoyi.activity;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

/**

- 启动程序
-
- @author qiheng
  */
  @SpringBootApplication(exclude = { DataSourceAutoConfiguration.class })
  public class ActivityApplication
  {
  public static void main(String[] args)
  {
  // System.setProperty("spring.devtools.restart.enabled", "false");
  SpringApplication.run(ActivityApplication.class, args);
  System.out.println("(♥◠‿◠)ﾉﾞ 若依启动成功 ლ(´ڡ`ლ)ﾞ  \n" +
                " .-------.       ____     __        \n" +
                " |  _ _   \\      \\   \\   /  /    \n" +
                " | ( ' )  |       \\  _. /  '       \n" +
                " |(_ o _) /        _( )_ .'         \n" +
                " | (_,_).' __  ___(_ o _)'          \n" +
                " |  |\\ \\  |  ||   |(_,_)'         \n" +
                " |  | \\ `' /| `-'  /           \n" +
                " |  |  \\    /  \\      /           \n" +
                " ''-'   `'-' `-..-' ");
  }
  }