Spring boot Web测试客户端模拟多部分文件不起作用

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;

@WebMvcTest(YourController.class)
public class YourControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @Test
    public void testUploadFile() throws Exception {
        MockMultipartFile file = new MockMultipartFile("file", "test.txt", "text/plain", "Hello, World!".getBytes());

        mockMvc.perform(MockMvcRequestBuilders.multipart("/upload")
                .file(file))
                .andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.content().string("File uploaded successfully"));
    }
}