SpringBoot2.1.1中带有随机\u端口的SpringBootTest每次都使用8080

我有一个在Spring Boot 2.1.1和Java 11中运行的测试类,不管我做什么,它都在端口8080上运行:

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@RunWith( SpringJUnit4ClassRunner.class )
@SpringBootTest(
    webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
    classes = TestClass.Config.class
)
@ContextConfiguration(
    classes = TestClass.Config.class
)
@TestPropertySource( properties = "server.port=0" )
public class TestClass
{
    @LocalServerPort
    private String port;

    @Test
    public void testPort() throws Exception
    {
        mockMvc
        .perform(
            MockMvcRequestBuilders.get( "/" )
        )
        .andExpect( MockMvcResultMatchers.status().isOk() );
    }

    @Configuration
    @RestController
    public static class Config
    {
        @Bean
        ServletWebServerFactory servletWebServerFactory()
        {
            return new TomcatServletWebServerFactory();
        }

        @GetMapping( "/" )
        public String test(HttpServletRequest request, HttpServletResponse response)
        {
            //This still shows no random port
            System.out.println( request.getLocalPort() );

            return "ok";
        }
    }
}

即使我试过这个:

@Bean
ServletWebServerFactory servletWebServerFactory()
{
    TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
    factory.setPort( SocketUtils.findAvailableTcpPort() );
    return factory;
}

哪一个 实地调查结果 port 由于具有随机端口号,MockMvc仍然使用控制器的默认端口。

如何使用随机端口?