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Could not autowire.No beans of ‘userMapper‘ type found.

2022-07-27 05:00:00 【修罗_】

这里并没有错误，但是IDEA报红

在这里插入图片描述

package com.example.demo.mapper;

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;

@SpringBootTest
@RunWith(SpringRunner.class)  // 启动这个单元测试类
public class UserMapperTest {
    
    @Autowired
    UserMapper userMapper;

    public void insert() {
    

    }
}