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

There are no mistakes here , however IDEA Report red

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)  //  Start this unit test class 
public class UserMapperTest {
    
    @Autowired
    UserMapper userMapper;

    public void insert() {
    

    }
}

Click on File>Settings>Inspections>Spring>Spring Core>Core>Autowiring for Bean Class>Severity:No highlighting,only fix

Finally, click ok

solve