Что значит выполнить TODO?

Есть задача: написать тест ExampleTest(junit) и выполнить TODO. Что значит выполнить TODO?

package com.example.cinema.base.webapp.facade.admin.impl;

import com.example.cinema.base.models.dto.ProductionStudioRequestDto;
import com.example.cinema.base.models.entitys.ProductionStudio;
import com.example.cinema.base.converter.ProductionStudioMapper;
import com.example.cinema.base.service.entity.impl.ProductionStudioServiceImpl;
import com.example.cinema.base.webapp.facade.admin.ProductionStudioServiceFacade;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;

@Component
@RequiredArgsConstructor
public class ProductionStudioServiceFacadeImpl implements ProductionStudioServiceFacade {

    private final ProductionStudioServiceImpl productionStudioService;
    private final ProductionStudioMapper productionStudioMapper;

    @Override
    public void save(ProductionStudioRequestDto dto) {
        ProductionStudio studio = productionStudioMapper.toEntity(dto);
        productionStudioService.save(studio);
    }

    @Override
    public void delete(long id) {
        //TODО валидация на существование
        productionStudioService.deleteById(id);
    }

    @Override
    public void update(long id, ProductionStudioRequestDto dto) {
        //TODО валидация на существование
        ProductionStudio studio = productionStudioMapper.toEntity(dto);
        productionStudioService.save(studio);
    }
}

Контроллер

package com.example.cinema.base.webapp.rest.admin;

import com.example.cinema.base.models.dto.ProductionStudioRequestDto;
import com.example.cinema.base.webapp.facade.admin.ProductionStudioServiceFacade;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("api/admin")
@RequiredArgsConstructor
public class AdminProductionStudioRestController {

    private final ProductionStudioServiceFacade productionStudioServiceFacade;

    @PostMapping("/studios")
    public ResponseEntity<HttpStatus> addProductionStudio(@RequestBody ProductionStudioRequestDto dto) {
        productionStudioServiceFacade.save(dto);
        return ResponseEntity.ok(HttpStatus.OK);
    }

    @DeleteMapping("/studios/{id}")
    public ResponseEntity<HttpStatus> deleteProductionStudio(@PathVariable("id") Long id) {
        productionStudioServiceFacade.delete(id);
        return ResponseEntity.ok(HttpStatus.OK);
    }

    @PutMapping("/studios/{id}")
    public ResponseEntity<HttpStatus> updateProductionStudio(@PathVariable("id") Long id,
                                                             @RequestBody ProductionStudioRequestDto dto) {
        productionStudioServiceFacade.update(id, dto);
        return ResponseEntity.ok(HttpStatus.OK);
    }
}