Spring mvc : Unit testing a controller with MockMultipartFIle and other form data

Question

I'm trying to unit test a controller which takes an request object of type ArticleForm and it contains a list of MultipartFile .

Here is the controller method that I'm trying to test.

@RequestMapping(value = "/admin/save", method = RequestMethod.POST)
    public String save(@ModelAttribute @Valid ArticleForm articleForm,
                BindingResult result, RedirectAttributes redirectAttributes) {
  ....
 }

Below is the Model attribute object ArticleForm

public class ArticleForm {
    private String id;

    @NotEmpty
    private String title;

    @NotEmpty
    private String description;

    private List<MultipartFile> images = Collections.emptyList();

  }

In my unit test, I want to submit 3 MockMulitpartFile objects as well as title and description

Here is what I have tried. The title and description gets populated but the images list is empty

@Test
public void adminController_saveArticleWithTitleAndDescription() throws Exception {

    final MockMultipartFile multipartFile1 = new MockMultipartFile("image1", "image1", "image/png", getResourceAsStream("/images/image1.png"));
    final MockMultipartFile multipartFile2 = new MockMultipartFile("image2", "image2", "image/png", getResourceAsStream("/images/image2.png"));
    final MockMultipartFile multipartFile3 = new MockMultipartFile("image3", "image3", "image/jpeg", getResourceAsStream("/images/image2.png"));

    mockMvc.perform(fileUpload("/admin/save")
            .file(multipartFile1)
            .file(multipartFile2)
            .file(multipartFile3)
            .contentType(MediaType.MULTIPART_FORM_DATA)
            .param("title", "Integration Testing")
            .param("description", "This is an integration test"))
            .andExpect(flash().attribute(FLASH_TYPE, is(FLASH_TYPE_SUCCESS)))
            .andExpect(flash().attribute(FLASH_MESSAGE, is(msgs.getMessage("controller.admin.save.success"))))
            .andExpect(status().isFound())
            .andExpect(view().name("redirect:/admin/add"));
}

How can I submit those 3 MockMultipartFile objects to the images list in the ArticleForm model attribute ?

Appreciate any help to resolve this issue.

Answer 1

Your test is correct. Use "images" for the file name like below.

final MockMultipartFile multipartFile1 = new MockMultipartFile("images", "image1", "image/png", getResourceAsStream("/images/image1.png"));
final MockMultipartFile multipartFile2 = new MockMultipartFile("images", "image2", "image/png", getResourceAsStream("/images/image2.png"));
final MockMultipartFile multipartFile3 = new MockMultipartFile("images", "image3", "image/jpeg", getResourceAsStream("/images/image2.png"));