@MockBean
    CategoryRepository categoryRepository;
    @Autowired
    CategoryService categoryService;
    @Autowired
    CategoryMapper categoryMapper;

    CategoryDto categoryDto;
    Category category;

    @BeforeEach
    public void init() {
        category = new Category();
        category.setId(5L);
        category.setName("testname");
        category.setParentId(2L);
        categoryDto = categoryMapper.toDto(category);
    }

    @Test
    public void should_return_same_category_when_find_by_id() {
        when(categoryRepository.findById(5L)).thenReturn(Optional.of(category));
    }