Spring boot test for Restful POST API DTO with MultiPartFile attribute - java

I have a Spring Boot app which has a RestController with the following POST method:
#PostMapping(path = "/add", headers = {"content-type=multipart/form-data; charset=utf-8"})
public ResponseEntity<UserWebDTO> addUser(#RequestHeader HttpHeaders headers, #ModelAttribute UserAddDTO userAddDTO) throws Exception {
return new ResponseEntity<>(userService.addUser(userAddDTO), HttpStatus.CREATED);
}
and UserAddDto is as follows:
public class UserAddDTO {
private String first_name;
private String last_name;
private String country_code;
private String phone_number;
private GenderEnum gender;
private String birthdate;
private MultipartFile avatar;
private String email;
}
The code works fine from postman, but I have no idea how to make an integration test with MockMvc for this dto with Multipartfile object, and the test I tried gives me :
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class java.io.ByteArrayInputStream and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.user.basic.authentication.dtos.UserAddDTO["avatar"]->org.springframework.mock.web.MockMultipartFile["inputStream"])
any help is appreciated.
Thanks!


I believe that you need to implements Serializable
public class UserAddDTO implements Serializable {
private static final long serialVersionUID = 1L;
private String first_name;
private String last_name;
private String country_code;
private String phone_number;
private GenderEnum gender;
private String birthdate;
private MultipartFile avatar;
private String email;
}

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