用MockMVC测试Spring MVC请求参数映射和MultipartFile

@RestController
@RequestMapping("/api")
public class FileUploadController {

    @PostMapping("/upload")
    public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file, @RequestParam("name") String name) {
        if (file.isEmpty()) {
            return ResponseEntity.badRequest().body("Please select a file to upload.");
        }
        return ResponseEntity.ok("File uploaded successfully: " + file.getOriginalFilename() + ", Name: " + name);
    }
}

@RunWith(SpringRunner.class)
@WebMvcTest(FileUploadController.class)
public class FileUploadControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private FileUploadService fileUploadService; // 假设有一个服务类处理文件上传

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

        mockMvc.perform(MockMvcRequestBuilders.multipart("/api/upload")
                .file(file)
                .param("name", "Test User"))
                .andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.content().string("File uploaded successfully: test.txt, Name: Test User"));
    }

    @Test
    public void testUploadEmptyFile() throws Exception {
        MockMultipartFile file = new MockMultipartFile(
                "file", "", "text/plain", new byte[0]);

        mockMvc.perform(MockMvcRequestBuilders.multipart("/api/upload")
                .file(file)
                .param("name", "Test User"))
                .andExpect(MockMvcResultMatchers.status().isBadRequest())
                .andExpect(MockMvcResultMatchers.content().string("Please select a file to upload."));
    }
}

MockMultipartFile file = new MockMultipartFile(
        "file", "test.txt", "text/plain", "Spring Framework".getBytes());

mockMvc.perform(MockMvcRequestBuilders.multipart("/api/upload")
        .file(file)
        .param("name", "Test User"))