单元测试 报错：ava.lang.Exception: No tests found matching

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

错误提示如上

错误代码如下：

import java.net.URL;
import org.junit.Before;
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.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.http.ResponseEntity;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment =SpringBootTest.WebEnvironment.RANDOM_PORT)
class DemoApplicationTests {
     
    @LocalServerPort
    private int port;
    
    private URL base;
    
    @Autowired
    private TestRestTemplate testr;
    
    @Before
    public void setUp() throws Exception  {
        
            this.base =new URL("http://localhost:" +port +"/hello");
        
    } 
    
    @Test
    public void getHello() {
        ResponseEntity<String>rEntity 
        =testr.getForEntity(base.toString(), String.class); 
        
        System.out.println(rEntity.getBody());
    }
    

    @Test
    public void contextLoads() {
    }

}

解决办法：类上面一定得加public修饰！因为我这个项目是 在网上导入的模板，测试类居然没加public修饰。