我想在spring boot集成测试中创建bean之前模拟服务器

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;

import static org.mockito.Mockito.when;
import static org.junit.jupiter.api.Assertions.assertEquals;

@SpringBootTest
public class MyServiceIntegrationTest {

    @Autowired
    private MyService myService;

    @MockBean
    private ExternalServer externalServer; // 假设这是一个需要模拟的外部服务

    @BeforeEach
    public void setUp() {
        // 在创建bean之前模拟服务器的行为
        when(externalServer.fetchData()).thenReturn("Mocked Data");
    }

    @Test
    public void testMyServiceWithMockedServer() {
        String result = myService.performAction();
        assertEquals("Expected Result Based on Mocked Data", result);
    }
}