如何测试其余控制器包含多部分请求

Question

用于rest api的控制器，对于该测试我使用spring开发了一个测试用例

但是当我试图调用它时会出现500错误

请任何人告诉我如何测试？

如何从测试用例中调用该休息api url

休息api代码

@RequestMapping(value = "/new-work-plan", method = RequestMethod.POST)
public @ResponseBody String newWorkPlan(
        @RequestBody WorkPlanEntity workplan, BindingResult result,
        @RequestParam("signature") MultipartFile file {

    System.out.println(workplan.getName());
    System.out.println(workplan.getLocation());
    System.out.println(file.isEmpty() + " " + file.getOriginalFilename() + " " + file.getSize());

    return "";
}

test rest api

WorkPlanEntity wpe = new WorkPlanEntity();
wpe.setName("chaithu");
wpe.setLocation("Hyd");

MultiValueMap<String, Object> image = new LinkedMultiValueMap<String, Object>();
image.add("file1", new FileSystemResource("C:\\Users\\Public\\Pictures\\Sample Pictures\\Lighthouse.jpg"));

ResponseEntity<String> response3 = rest.postForEntity(URI + "new-work-plan/", wpe, String.class,  parts);
    System.out.println(response3);