SpringBoot写测试类

导包

<!--测试-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>

　　光标在类名上，快捷键Alt+Enter　

　 SpringBoot写测试类

package com.company.mapper;

import com.company.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import static org.junit.jupiter.api.Assertions.*;

//加上这两个注解，运行测试方法的时候就会启动SpringBoot
@RunWith(SpringRunner.class)
@SpringBootTest(classes = 启动类.class)

public class UserMapperTest {
    @Autowired
    private UserMapper mapper;

    @Test
    public void testUser(){
        System.out.println(mapper.selectByPrimaryKey(1));
    }
}