finish can_insert_category test
finish insertCategory method
delete useless codes
finish insertCategory method
add default cinstructor
finish can_delete_category_by_id test
finish deleteCategoryById method
configure target
finish deleteCategoryById method
finish deleteCategoryById in controller
finish can_update_category_by_id test
finish updateCategoryById method
modify type of parameter
finish updateCategoryById in dao
finish updateCategoryById method in service
add all target
add package to .gitignore
create itemServiceImplTest class
create itemDao interface
to interface