如何使用Spring MVC Test对多部分POST请求进行单元测试？

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = { AppConfig.class })
public class MyControllerTest {

    private MockMvc mockMvc;

    @Autowired
    private MyController myController;

    @Before
    public void setup() {
        mockMvc = MockMvcBuilders.standaloneSetup(myController).build();
    }

    @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)
                .param("param1", "value1")
                .param("param2", "value2"))
                .andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.content().string("File uploaded successfully"));
    }
}