JUNIT test for @RequestPart

[pragati dev]

Here I want to write a test for following controller method, on executing method of the testclass I'm getting an error as required part formData is not present, I've tried finding a solution for testing an object having 'RequestPart' annotation but no luck, can someone please take a look and suggest a way to write JUNIT test for @RequestPart

[code]

@PostMapping("/user")
public ResponseEntity<UserDTO> createUser(@RequestPart(value = "files", required= false) MultipartFile[] files,
@RequestPart("formData") UserDTO userDTO) throws URISyntaxException {

userService.save(userDTO, files);

//....

}

Inside TestClass-

@BeforeEach
public void initTest()
{
user = createEntity(em);// inside this method I've set all the properties of userDTO and 'user' is a reference variable to User class
}

public void createUser() throws Exception {

UserDTO userDTO = userMapper.toDto(user);

mockMvc.
perform(post("/api/user")
.contentType(TestUtil.APPLICATION_JSON_UTF8)
.content(TestUtil.convertObjectToJsonBytes(userDTO)))
.andExpect(status().isCreated());
}

[Himai Minh]

Hi, in your test case, first create a private method:

private MockMultipartFile createMultipartFile(String originalContent, String requetsPart, String filename, String contentType){
  return new MockMultipartFile(requestPart, filename, contentType, originalContent.getBytes());
}

Then in your @Test method, do this:

String userDTO_json = "{ ....}"; //put your data in JSON format here
MockMultipartFile filepart = createMultipartFile(userDTO_json, "formData", "", "application/json");
mockMvc.perform(MockMvcRequestBuilders.multipart("/api/user").file(filepart).characterEncoding("UTF_8")).andExpect(status().isCreated());

[pragati dev]

Thanks for this but when I also added WebConfig class as below I'm getting following error can you please suggest something
[code]
@Configuration
@ComponentScan({ "com.web.rest" })
@EnableWebMvc

public class WebConfig extends WebMvcConfigurationSupport {

 @Bean
 public MultipartResolver multipartResolver() {
   CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
   return multipartResolver;
 }


}
[code]

Error creating bean with name 'multipartResolver' defined in class path resource [com/web/rest/WebConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.multipart.MultipartResolver]: Factory method 'multipartResolver' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory  

[Himai Minh]

Hi, you may find this Stackoverflow post helpful.
You may need to add commons-fileupload dependency:
https://stackoverflow.com/questions/5166898/java-lang-noclassdeffounderror-org-apache-commons-fileupload-fileitemfactory

[pragati dev]

Thanks your solution did help, I've added the dependency but now when I execute the test method I get following error and when I debugged it I got createDate as
"createdDate":{
     "epochSecond":1589718619,
     "nano":876000000
  }
and createDate is a field of User object which of type Instant, can you please suggest how to resolve it?


   

      ...
      ObjectMapper Obj = new ObjectMapper();
      String jsonStr = Obj.writeValueAsString(UserDTO);
      MockMultipartFile jsonFile = new MockMultipartFile("formData", "", "application/json", jsonStr.getBytes());
      restUserMockMvc
        .perform(MockMvcRequestBuilders.multipart("/api/users")
          .file(jsonFile))
        .andExpect(status().isCreated());

: Bad Request: JSON parse error: Unexpected token (START_OBJECT), expected one of [VALUE_STRING, VALUE_NUMBER_INT, VALUE_NUMBER_FLOAT] for java.time.Instant value; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected one of [VALUE_STRING, VALUE_NUMBER_INT, VALUE_NUMBER_FLOAT] for java.time.Instant value
at [Source: (ByteArrayInputStream); line: 1, column: 33] (through reference chain: com.fis.pta.service.dto.UserDTO["createdDate"])

[Himai Minh]

Hi,
Is your userDTO an object or a Json string?
One thing you can try is to create a json string that represents your userDTO object.

[pragati dev]

Hi,
 UserDTO is an Object whose values are set under createEntity method which executes when I run createUser() -test method  and that UserDTO has createDate field which is of Instant type and it is not being set in createEntity method is gets updated automatically

[pragati dev]

I have converted my UserDTO into json string but it's property createDate is being converted as
"createdDate":{
    "epochSecond":1589718619,
    "nano":876000000
 }
this is causing error
: Bad Request: JSON parse error: Unexpected token (START_OBJECT), expected one of [VALUE_STRING, VALUE_NUMBER_INT, VALUE_NUMBER_FLOAT] for java.time.Instant value; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected one of [VALUE_STRING, VALUE_NUMBER_INT, VALUE_NUMBER_FLOAT] for java.time.Instant value
at [Source: (ByteArrayInputStream); line: 1, column: 33] (through reference chain: com.fis.pta.service.dto.UserDTO["createdDate"])
any suggestions please to resolve it?

[Himai Minh]

Does your userDTO in json look like this

 {"name": "john", "location": "UK","createdDate" : "2020-05-18 12:00:00" }

?
I guess the date format does not match with what your code expects.