### Question:
CategoryServiceImpl implements CategoryService { @Override public List<ProductCategory> findByCategoryTypeIn(List<Integer> categoryTypeList) { return repository.findByCategoryTypeIn(categoryTypeList); }  @Override ProductCategory findOne(Integer categoryId); @Override List<ProductCategory> findAll(); @Override List<ProductCategory> findByCategoryTypeIn(List<Integer> categoryTypeList); @Override ProductCategory save(ProductCategory productCategory);  }### Answer:
@Test public void findByCategoryTypeIn() throws Exception { List<ProductCategory> productCategoryList = categoryService.findByCategoryTypeIn(Arrays.asList(1,2,3,4)); Assert.assertNotEquals(0, productCategoryList.size()); }