Merge remote-tracking branch 'origin/main'

Reviewed-on: #1

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookDTO.java

@@ -0,0 +1,23 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book;
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Date;
+
+@Builder
+@Getter
+public class BookDTO {
+    private final String isbn;
+    private final String title;
+    private final String author;
+    private final String publisher;
+    private final Date date;
+    private final double price;
+    private final int initialStock;
+    private final ArrayList<String> categories;
+    private final String description;
+    private final String language;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookInfo.java

@@ -0,0 +1,17 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+public record BookInfo(String isbn,
+                                        String title,
+                                        String author,
+                                        String publisher,
+                                        Date date,
+                                        double price,
+                                        int initialStock,
+                                        ArrayList<String>categories,
+                                        String description,
+                                        String language){
+
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverter.java

@@ -0,0 +1,44 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.converter;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+
+public final class BookConverter {
+    private BookConverter(){
+
+    }
+
+    public static Book toDomain(BookInfo newBook) {
+        return Book.builder()
+                .isbn(newBook.isbn())
+                .title(newBook.title())
+                .author(newBook.author())
+                .publisher(newBook.publisher())
+                .date(newBook.date())
+                .price(newBook.price())
+                .initialStock(newBook.initialStock())
+                .categories(newBook.categories())
+                .description(newBook.description())
+                .language(newBook.language())
+                .build();
+    }
+
+    public static BookDTO toDTO(Book book) {
+        return BookDTO.builder()
+                .isbn(book.getIsbn())
+                .title(book.getTitle())
+                .author(book.getAuthor())
+                .publisher(book.getPublisher())
+                .date(book.getDate())
+                .price(book.getPrice())
+                .initialStock(book.getInitialStock())
+                .categories(book.getCategories())
+                .description(book.getDescription())
+                .language(book.getLanguage())
+                .build();
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/entity/Book.java

@@ -0,0 +1,37 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.entity;
+
+
+
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.IllegalBookStockException;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Date;
+
+@Builder
+@Getter
+public class Book {
+
+    private String isbn;
+    private String title;
+    private String author;
+    private String publisher;
+    private Date date;
+    private double price;
+    private int initialStock;
+    private ArrayList<String> categories;
+    private String description;
+    private String language;
+
+    public void removeStock(int stockToRemove) throws IllegalBookStockException{
+        if (initialStock - stockToRemove <0){ throw new IllegalBookStockException(stockToRemove,initialStock); }
+        initialStock = initialStock - stockToRemove;
+    }
+
+    public void addStock(int stockToAdd) {
+        initialStock = initialStock + stockToAdd;
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/exception/BookNotFoundException.java

@@ -0,0 +1,13 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.exception;
+
+import java.text.MessageFormat;
+import java.util.UUID;
+
+public class BookNotFoundException extends Exception {
+
+    public static final String THE_BOOK_WITH_ISBN_DOES_NOT_EXIST_MESSAGE = "Book not found: {0}";
+
+    public BookNotFoundException(String isbn) {
+        super(MessageFormat.format(THE_BOOK_WITH_ISBN_DOES_NOT_EXIST_MESSAGE, isbn));
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/exception/IllegalBookStockException.java

@@ -0,0 +1,13 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.exception;
+
+import java.text.MessageFormat;
+
+public class IllegalBookStockException extends Exception {
+
+    public static final String CANNOT_REMOVE_STOCK = "Cannot remove {0} stock from {1} stock";
+
+    public IllegalBookStockException(int needed, int actual) {
+        super(MessageFormat.format(CANNOT_REMOVE_STOCK, needed,
+                actual));
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/exception/NotValidBookException.java

@@ -0,0 +1,8 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.exception;
+
+public class NotValidBookException extends Exception {
+
+    public NotValidBookException(String message) {
+        super(message);
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/repository/BookRepository.java

@@ -0,0 +1,55 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.repository;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+import lombok.NoArgsConstructor;
+
+import javax.swing.text.html.Option;
+
+@NoArgsConstructor
+public final class BookRepository {
+    private final List<Book> books = new ArrayList<>();
+
+    public List<Book> findAll() {
+        return books;
+    }
+
+    public void deleteAll() {
+        books.clear();
+    }
+
+    public Book save(Book newBook) {
+        for (Book book: books) {
+            if (book.getIsbn().equals(newBook.getIsbn())){
+                books.remove(book);
+                break;
+            }
+        }
+        this.books.add(newBook);
+        return newBook;
+    }
+
+    public Optional<Book> findByISBN(String isbn) {
+        for (Book book:books) {
+            System.out.println(book.getIsbn());
+            if(book.getIsbn().equals(isbn)){
+                return Optional.of(book);
+            }
+        }
+        return Optional.empty();
+    }
+
+    public boolean existsByISBN(String isbn) {
+        return this.books.stream()
+                .anyMatch(book -> book.getIsbn().equals(isbn));
+    }
+
+
+
+    public void delete(Book book) {
+        this.books.remove(book);
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/usecase/BookUseCase.java

@@ -0,0 +1,85 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.usecase;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.converter.BookConverter;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.IllegalBookStockException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.validator.BookValidator;
+import java.util.Optional;
+import java.util.UUID;
+
+public final class BookUseCase {
+
+    private final BookRepository bookRepository;
+
+    public BookUseCase(BookRepository bookRepository) {
+        this.bookRepository = bookRepository;
+    }
+
+    public String registerBook(BookInfo newBook) throws NotValidBookException {
+        BookValidator.validate(newBook);
+        Book bookToRegister = BookConverter.toDomain(newBook);
+        bookRepository.save(bookToRegister);
+        return bookToRegister.getIsbn();
+    }
+
+    public Optional<BookDTO> findBookByISBN(String isbn) {
+        System.out.println(bookRepository.findAll().size());
+        Optional<Book> optionalBook = bookRepository.findByISBN(isbn);
+        return optionalBook.map(BookConverter::toDTO);
+    }
+
+    public BookDTO updateBook(String isbn, BookInfo bookInfo)
+            throws BookNotFoundException, NotValidBookException {
+        BookValidator.validate(bookInfo);
+        Book bookByISBN = getBookIfDoesNotExistThrowBookNotFoundException(
+                isbn);
+        Book book = Book.builder()
+                .isbn(isbn)
+                .title(bookInfo.title())
+                .author(bookInfo.author())
+                .publisher(bookInfo.publisher())
+                .date(bookInfo.date())
+                .price(bookInfo.price())
+                .initialStock(bookInfo.initialStock())
+                .categories(bookInfo.categories())
+                .description(bookInfo.description())
+                .language(bookInfo.language())
+                .build();
+        Book updatedBook = bookRepository.save(book);
+        return BookConverter.toDTO(updatedBook);
+    }
+
+    public void deleteBook(String isbn) throws BookNotFoundException {
+        Book bookToDelete = getBookIfDoesNotExistThrowBookNotFoundException(isbn);
+        this.bookRepository.delete(bookToDelete);
+    }
+
+    public int addStock(String isbn, int stockToAdd) throws BookNotFoundException {
+        Book bookToAddStock = getBookIfDoesNotExistThrowBookNotFoundException(isbn);
+        bookToAddStock.addStock(stockToAdd);
+        bookRepository.save(bookToAddStock);
+        return bookToAddStock.getInitialStock();
+    }
+
+    public int subtractStock(String isbn, int loyaltyPointToRemove)
+            throws BookNotFoundException, IllegalBookStockException {
+        Book bookToSubtractStock = getBookIfDoesNotExistThrowBookNotFoundException(isbn);
+        bookToSubtractStock.removeStock(loyaltyPointToRemove);
+        bookRepository.save(bookToSubtractStock);
+        return bookToSubtractStock.getInitialStock();
+    }
+
+    private Book getBookIfDoesNotExistThrowBookNotFoundException(String isbn)
+            throws BookNotFoundException {
+        Optional<Book> optionalBookById = bookRepository.findByISBN(isbn);
+        if (optionalBookById.isEmpty()) {
+            throw new BookNotFoundException(isbn);
+        }
+        return optionalBookById.get();
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/validator/BookValidator.java

@@ -0,0 +1,74 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.validator;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+
+public final class BookValidator {
+
+    public static final String ISBN_IS_NOT_VALID = "ISBN is not valid";
+    public static final String ISBN_CANNOT_BE_BLANK = "ISBN cannot be blank";
+    public static final String TITLE_CANNOT_BE_BLANK = "Title cannot be blank";
+    public static final String AUTHOR_CANNOT_BE_BLANK = "Author cannot be blank";
+    public static final String PUBLISHER_CANNOT_BE_BLANK = "Publisher cannot be blank";
+    public static final String PRICE_CANNOT_BE_NEGATIVE = "Price cannot be negative";
+    public static final String PRICE_CANNOT_BE_EQUAL_TO_ZERO = "Price cannot be equal to zero";
+    public static final String INITIAL_STOCK_CANNOT_BE_NEGATIVE = "Stock cannot be negative";
+
+    public static final String ISBN_REGEX = "\\d{13}";
+
+    private BookValidator() {
+
+    }
+
+    public static void validate(BookInfo newBook) throws NotValidBookException {
+        validateAuthor(newBook);
+        validateTitle(newBook);
+        validatePublisher(newBook);
+        validateISBN(newBook);
+        validatePrice(newBook);
+        validateInitialStock(newBook);
+    }
+
+    private static void validateISBN(BookInfo newBook)
+            throws NotValidBookException {
+        if (newBook.isbn().isBlank()) {
+            throw new NotValidBookException(ISBN_CANNOT_BE_BLANK);
+        }
+        if (!newBook.isbn().matches(ISBN_REGEX)) {
+            throw new NotValidBookException(ISBN_IS_NOT_VALID);
+        }
+    }
+
+    private static void validateTitle(BookInfo newBook) throws NotValidBookException {
+        if (newBook.title().isBlank()) {
+            throw new NotValidBookException(TITLE_CANNOT_BE_BLANK);
+        }
+    }
+
+    private static void validateAuthor(BookInfo newBook) throws NotValidBookException {
+        if (newBook.author().isBlank()) {
+            throw new NotValidBookException(AUTHOR_CANNOT_BE_BLANK);
+        }
+    }
+
+    private static void validatePublisher(BookInfo newBook) throws NotValidBookException {
+        if (newBook.publisher().isBlank()){
+            throw new NotValidBookException(PUBLISHER_CANNOT_BE_BLANK);
+        }
+    }
+
+    private static void validatePrice(BookInfo newBook) throws NotValidBookException {
+        if (newBook.price() < 0){
+            throw new NotValidBookException(PRICE_CANNOT_BE_NEGATIVE);
+        } else if (newBook.price() == 0){
+            throw new NotValidBookException(PRICE_CANNOT_BE_EQUAL_TO_ZERO);
+        }
+    }
+
+    private static void validateInitialStock(BookInfo newBook) throws  NotValidBookException {
+        if (newBook.initialStock() < 0){
+            throw new NotValidBookException(INITIAL_STOCK_CANNOT_BE_NEGATIVE);
+        }
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/customer/entity/Customer.java

@@ -8,6 +8,7 @@ import lombok.Getter;
 
 @Builder
 @Getter
+
 public class Customer {
  private UUID id;
  private String firstName;

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/customer/repository/CustomerRepository.java

@@ -20,15 +20,23 @@ public final class CustomerRepository {
   }
 
   public Customer save(Customer newCustomer) {
-    Optional<Customer> optionalCustomerWithSameId = this.findById(newCustomer.getId());
+    if (newCustomer.getId() == null) {
-    optionalCustomerWithSameId.ifPresentOrElse(customers::remove, newCustomer::setRandomUUID);
+      newCustomer.setRandomUUID();
+    }
+
+    this.findById(newCustomer.getId()).ifPresent(customers::remove);
+
     this.customers.add(newCustomer);
     return newCustomer;
   }
 
   public Optional<Customer> findById(UUID uuid) {
+    if (uuid == null) {
+      return Optional.empty();
+    }
+
     return this.customers.stream()
-        .filter(customer -> customer.getId().equals(uuid))
+        .filter(customer -> uuid.equals(customer.getId()))
         .findFirst();
   }
 

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/AddressDTO.java

@@ -0,0 +1,13 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Builder
+@Getter
+public class AddressDTO {
+    private final String street;
+    private final String city;
+    private final String postalCode;
+    private final String country;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderDTO.java

@@ -0,0 +1,19 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.util.List;
+import java.util.UUID;
+
+@Builder
+@Getter
+public class OrderDTO {
+    private final UUID id;
+    private final UUID customerId;
+    private final List<OrderLineDTO> orderLines;
+    private final double totalPrice;
+    private final double totalPriceToPay;
+    private final AddressDTO address;
+    private final PaymentMethod paymentMethod;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderInfo.java

@@ -0,0 +1,17 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.Setter;
+import java.util.List;
+import java.util.UUID;
+
+@Getter
+@Setter
+@Builder
+public class OrderInfo {
+    private UUID customerId;
+    private List<OrderLineDTO> orderLines;
+    private AddressDTO address;
+    private String paymentMethod;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderLineDTO.java

@@ -0,0 +1,11 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Builder
+@Getter
+public class OrderLineDTO {
+    private final String bookId;
+    private final int quantity;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/PaymentMethod.java

@@ -0,0 +1,6 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+public enum PaymentMethod {
+    CREDIT_CARD,
+    LOYALTY_POINTS
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/converter/OrderConverter.java

@@ -0,0 +1,35 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.converter;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderLineDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.AddressDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.PaymentMethod;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.entity.Order;
+
+public class OrderConverter {
+    private OrderConverter() {
+
+    }
+
+    public static Order toDomain(OrderInfo orderInfo) {
+        return Order.builder()
+                .customerId(orderInfo.getCustomerId())
+                .orderLines(orderInfo.getOrderLines())
+                .address(orderInfo.getAddress())
+                .paymentMethod(PaymentMethod.valueOf(orderInfo.getPaymentMethod()))
+                .build();
+    }
+
+    public static OrderDTO toDTO(Order order) {
+        return OrderDTO.builder()
+                .id(order.getId())
+                .customerId(order.getCustomerId())
+                .orderLines(order.getOrderLines())
+                .totalPrice(order.getTotalPrice())
+                .totalPriceToPay(order.getTotalPriceToPay())
+                .address(order.getAddress())
+                .paymentMethod(order.getPaymentMethod())
+                .build();
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/entity/Order.java

@@ -0,0 +1,27 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.entity;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.order.*;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.NotValidOrderException;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.List;
+import java.util.UUID;
+
+@Setter
+@Getter
+@Builder
+public class Order {
+    private UUID id;
+    private UUID customerId;
+    private List<OrderLineDTO> orderLines;
+    private double totalPrice;
+    private double totalPriceToPay;
+    private AddressDTO address;
+    private PaymentMethod paymentMethod;
+
+    public void setRandomUUID() {
+        this.id = UUID.randomUUID();
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/exception/NotValidOrderException.java

@@ -0,0 +1,7 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.exception;
+
+public class NotValidOrderException extends Exception {
+    public NotValidOrderException(String message) {
+        super(message);
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/exception/OrderNotFoundException.java

@@ -0,0 +1,13 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.exception;
+
+import java.text.MessageFormat;
+import java.util.UUID;
+
+public class OrderNotFoundException extends Exception {
+
+    public static final String THE_ORDER_WITH_ID_DOES_NOT_EXIST_MESSAGE = "The order with id {0} does not exist";
+
+    public OrderNotFoundException(String message) {
+        super(MessageFormat.format(THE_ORDER_WITH_ID_DOES_NOT_EXIST_MESSAGE, message));
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/exception/UserNotFoundException.java

@@ -0,0 +1,9 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.exception;
+
+public class UserNotFoundException extends RuntimeException {
+
+    public UserNotFoundException(String message) {
+        super(message);
+    }
+}
+

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/repository/OrderRepository.java

@@ -0,0 +1,49 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.repository;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.order.entity.Order;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public final class OrderRepository {
+    private final List<Order> orders = new ArrayList<>();
+
+    public List<Order> findAll() {
+        return orders;
+    }
+
+    public Order save(Order newOrder) {
+        Optional<Order> optionalOrderWithSameId = this.findById(newOrder.getId());
+        optionalOrderWithSameId.ifPresent(orders::remove);
+        if (newOrder.getId() == null) {
+            newOrder.setRandomUUID();
+        }
+        this.orders.add(newOrder);
+
+
+        return newOrder;
+    }
+
+    public Optional<Order> findById(UUID uuid) {
+        return this.orders.stream()
+            .filter(order -> order.getId().equals(uuid))
+            .findFirst();
+    }
+
+    public List<Order> findByCustomerId(UUID customerId) {
+        List<Order> result = new ArrayList<>();
+        for (Order order : orders) {
+            if (order.getCustomerId().equals(customerId)) {
+                result.add(order);
+            }
+        }
+
+        return result;
+    }
+
+    public boolean existsById(UUID uuid) {
+        return this.orders.stream()
+            .anyMatch(order -> order.getId().equals(uuid));
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCase.java

@@ -0,0 +1,193 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.usecase;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.IllegalBookStockException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.IllegalCustomerPointException;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.entity.Order;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.usecase.OrderUseCase;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderLineDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.AddressDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.PaymentMethod;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.repository.OrderRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.converter.OrderConverter;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.validator.OrderValidator;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.NotValidOrderException;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.OrderNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.UserNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class OrderUseCase {
+
+    private final OrderRepository orderRepository;
+    private final BookRepository bookRepository;
+    private final CustomerRepository customerRepository;
+
+
+    private OrderInfo tempOrderInfo;
+    private List<OrderLineDTO> tempOrderLines;
+    private AddressDTO tempAddress;
+
+    public OrderUseCase(OrderRepository orderRepository, BookRepository bookRepository, CustomerRepository customerRepository) {
+        this.orderRepository = orderRepository;
+        this.bookRepository = bookRepository;
+        this.customerRepository = customerRepository;
+    }
+
+    public void registerOrderInfo(OrderInfo orderInfo) {
+        this.tempOrderInfo = orderInfo;
+    }
+
+    public void addBooksToOrder(List<OrderLineDTO> orderLines)  throws NotValidOrderException {
+        this.tempOrderLines = orderLines;
+    }
+
+    public void setDeliveryAddress(AddressDTO address) {
+        this.tempAddress = address;
+    }
+
+    private double computeTotalPrice(List<OrderLineDTO> orderInfo) throws NotValidOrderException {
+        if (orderInfo == null || orderInfo.isEmpty()) {
+            throw new NotValidOrderException("Order lines cannot be null or empty");
+        }
+
+        double totalPrice = 0.0;
+        for (OrderLineDTO line : orderInfo) {
+            Book book = bookRepository.findByISBN(line.getBookId())
+                    .orElseThrow(() -> new NotValidOrderException("Book not found with ISBN: " + line.getBookId()));
+            totalPrice += book.getPrice() * line.getQuantity();
+        }
+        return totalPrice;
+    }
+
+    public UUID finalizeOrder() throws NotValidOrderException, UserNotFoundException, BookNotFoundException, IllegalBookStockException, IllegalCustomerPointException {
+        // Validation des données d'entrée
+        OrderInfo completeInfo = validateAndBuildOrderInfo();
+
+        // Récupération du client
+        Customer customer = customerRepository.findById(completeInfo.getCustomerId())
+                .orElseThrow(() -> new UserNotFoundException("Client introuvable"));
+
+        // Traitement des livres et calcul du prix
+        double totalPrice = processOrderLines(completeInfo.getOrderLines());
+
+        // Gestion du paiement
+        handlePayment(completeInfo, customer, totalPrice);
+
+        // Création et sauvegarde de la commande
+        UUID orderId = createAndSaveOrder(completeInfo, totalPrice);
+
+        // Nettoyage des données temporaires
+        resetTempData();
+
+        return orderId;
+    }
+
+    private OrderInfo validateAndBuildOrderInfo() throws NotValidOrderException, BookNotFoundException {
+        if (tempOrderInfo == null) throw new NotValidOrderException("Order info missing");
+        OrderInfo completeInfo = OrderInfo.builder()
+                .customerId(tempOrderInfo.getCustomerId())
+                .paymentMethod(tempOrderInfo.getPaymentMethod())
+                .orderLines(tempOrderLines)
+                .address(tempAddress)
+                .build();
+
+        // Validation centralisée
+        OrderValidator.validate(completeInfo, bookRepository, customerRepository);
+        return completeInfo;
+    }
+
+    private double processOrderLines(List<OrderLineDTO> orderLines) throws BookNotFoundException, IllegalBookStockException {
+        double totalPrice = 0.0;
+        for (OrderLineDTO line : orderLines) {
+            Book book = getBookOrThrow(line.getBookId());
+            updateBookStock(book, line.getQuantity());
+            totalPrice += calculateLinePrice(book, line.getQuantity());
+        }
+        return totalPrice;
+    }
+
+    private Book getBookOrThrow(String bookId) throws BookNotFoundException {
+        return bookRepository.findByISBN(bookId)
+                .orElseThrow(() -> new BookNotFoundException("Livre non trouvé: " + bookId));
+    }
+
+    private void updateBookStock(Book book, int quantity) throws IllegalBookStockException {
+        book.removeStock(quantity);
+        bookRepository.save(book);
+    }
+
+    private double calculateLinePrice(Book book, int quantity) {
+        return book.getPrice() * quantity;
+    }
+
+    private void handlePayment(OrderInfo orderInfo, Customer customer, double totalPrice) throws IllegalCustomerPointException {
+        if (isLoyaltyPointsPayment(orderInfo)) {
+            deductLoyaltyPoints(customer, totalPrice);
+        }
+    }
+
+    private boolean isLoyaltyPointsPayment(OrderInfo orderInfo) {
+        return "LOYALTY_POINTS".equalsIgnoreCase(orderInfo.getPaymentMethod());
+    }
+
+    private void deductLoyaltyPoints(Customer customer, double totalPrice) throws IllegalCustomerPointException {
+        int pointsToDeduct = (int) Math.round(totalPrice);
+        customer.removeLoyaltyPoints(pointsToDeduct);
+        customerRepository.save(customer);
+    }
+
+    private UUID createAndSaveOrder(OrderInfo orderInfo, double totalPrice) throws NotValidOrderException {
+        Order order = OrderConverter.toDomain(orderInfo);
+        order.setRandomUUID();
+        order.setAddress(tempAddress);
+        order.setOrderLines(tempOrderLines);
+        order.setTotalPrice(totalPrice);
+        order.setTotalPriceToPay(totalPrice);
+
+        orderRepository.save(order);
+        return order.getId();
+    }
+
+    private void resetTempData() {
+        tempOrderInfo = null;
+        tempOrderLines = null;
+        tempAddress = null;
+    }
+
+    public Optional<OrderDTO> findOrderById(UUID orderId) {
+        Optional<Order> order = orderRepository.findById(orderId);
+        return order.map(OrderConverter::toDTO);
+    }
+
+    public List<OrderDTO> findOrdersByCustomerId(UUID customerId) throws UserNotFoundException {
+        ensureCustomerExists(customerId);
+        List<Order> orders = orderRepository.findByCustomerId(customerId);
+        return orders.stream().map(OrderConverter::toDTO).collect(Collectors.toList());
+    }
+
+    private void ensureCustomerExists(UUID customerId) throws UserNotFoundException {
+        if (!customerRepository.findById(customerId).isPresent()) {
+            throw new UserNotFoundException("Customer not found");
+        }
+    }
+
+    public UUID registerOrder(OrderInfo orderInfo) throws NotValidOrderException, UserNotFoundException, BookNotFoundException {
+        OrderValidator.validate(orderInfo, bookRepository, customerRepository);
+        double total = computeTotalPrice(orderInfo.getOrderLines());
+        Order order = OrderConverter.toDomain(orderInfo);
+        order.setTotalPrice(total);
+        order.setTotalPriceToPay(total);
+        order.setRandomUUID();
+        orderRepository.save(order);
+        return order.getId();
+    }
+
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/validator/OrderValidator.java

@@ -0,0 +1,135 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.validator;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.NotValidOrderException;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderLineDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.AddressDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.UserNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import lombok.SneakyThrows;
+
+import java.util.List;
+
+public class OrderValidator {
+
+    public static final String CUSTOMER_ID_CANNOT_BE_NULL = "Customer ID cannot be null";
+    public static final String BOOK_LIST_CANNOT_BE_EMPTY = "Book list cannot be empty";
+    public static final String QUANTITY_MUST_BE_POSITIVE = "Quantity must be positive";
+    public static final String ADDRESS_FIELDS_ARE_REQUIRED = "Address fields are required";
+    public static final String PAYMENT_METHOD_IS_NOT_VALID = "Payment method is not valid";
+
+    private OrderValidator() {
+
+    }
+
+    public static void validate(OrderInfo orderInfo, BookRepository bookRepository, CustomerRepository customerRepository)
+            throws NotValidOrderException, UserNotFoundException, BookNotFoundException {
+        validateCustomerId(orderInfo);
+        Customer customer = validateCustomerExistence(orderInfo, customerRepository);
+        double totalPrice = validateBooksAndStock(orderInfo, bookRepository);
+        validateOrderLines(orderInfo);
+        validateAddress(orderInfo);
+        validatePaymentMethod(orderInfo);
+        validateLoyaltyPoints(orderInfo, customer, totalPrice);
+    }
+
+    private static Customer validateCustomerExistence(OrderInfo orderInfo, CustomerRepository customerRepository)
+            throws UserNotFoundException {
+        Customer customer = customerRepository.findById(orderInfo.getCustomerId()).orElse(null);
+        if (customer == null) {
+            throw new UserNotFoundException("Customer not found");
+        }
+        return customer;
+    }
+
+    private static double validateBooksAndStock(OrderInfo orderInfo, BookRepository bookRepository)
+            throws BookNotFoundException, NotValidOrderException {
+        double totalPrice = 0.0;
+        for (OrderLineDTO line : orderInfo.getOrderLines()) {
+            Book book = getBookOrThrow(line, bookRepository);
+            validateQuantityPositive(line);
+            validateStockSufficient(book, line);
+            totalPrice += book.getPrice() * line.getQuantity();
+        }
+        return totalPrice;
+    }
+
+    private static Book getBookOrThrow(OrderLineDTO line, BookRepository bookRepository) throws BookNotFoundException {
+        Book book = bookRepository.findByISBN(line.getBookId()).orElse(null);
+        if (book == null) {
+            throw new BookNotFoundException(line.getBookId());
+        }
+        return book;
+    }
+
+    private static void validateQuantityPositive(OrderLineDTO line) throws NotValidOrderException {
+        if (line.getQuantity() <= 0) {
+            throw new NotValidOrderException(QUANTITY_MUST_BE_POSITIVE);
+        }
+    }
+
+    private static void validateStockSufficient(Book book, OrderLineDTO line) throws NotValidOrderException {
+        if (book.getInitialStock() < line.getQuantity()) {
+            throw new NotValidOrderException("Insufficient book stock");
+        }
+    }
+
+    private static void validateLoyaltyPoints(OrderInfo orderInfo, Customer customer, double totalPrice)
+            throws NotValidOrderException {
+        if ("LOYALTY_POINTS".equalsIgnoreCase(orderInfo.getPaymentMethod())) {
+            int pointsToDeduct = (int) Math.round(totalPrice);
+            if (customer.getLoyaltyPoints() < pointsToDeduct) {
+                throw new NotValidOrderException("Not enough loyalty points");
+            }
+        }
+    }
+
+    private static void validateCustomerId(OrderInfo orderInfo) throws NotValidOrderException {
+        if (orderInfo.getCustomerId() == null) {
+            throw new NotValidOrderException(CUSTOMER_ID_CANNOT_BE_NULL);
+        }
+    }
+
+    private static void validateOrderLines(OrderInfo orderInfo) throws NotValidOrderException {
+        List<OrderLineDTO> lines = orderInfo.getOrderLines();
+        if (lines == null || lines.isEmpty()) {
+            throw new NotValidOrderException(BOOK_LIST_CANNOT_BE_EMPTY);
+        }
+        for (OrderLineDTO line : lines) {
+            validateOrderLine(line);
+        }
+    }
+
+    private static void validateOrderLine(OrderLineDTO line) throws NotValidOrderException {
+        validateQuantityPositive(line);
+    }
+
+    private static void validateAddress(OrderInfo orderInfo) throws NotValidOrderException {
+        AddressDTO address = orderInfo.getAddress();
+        if (address == null) {
+            throw new NotValidOrderException(ADDRESS_FIELDS_ARE_REQUIRED);
+        }
+        validateAddressFields(address);
+    }
+
+    private static void validateAddressFields(AddressDTO address) throws NotValidOrderException {
+        if (isBlank(address.getStreet()) || isBlank(address.getCity()) || isBlank(address.getPostalCode()) || isBlank(address.getCountry())) {
+            throw new NotValidOrderException(ADDRESS_FIELDS_ARE_REQUIRED);
+        }
+    }
+
+    private static boolean isBlank(String value) {
+        return value == null || value.isBlank();
+    }
+
+    private static void validatePaymentMethod(OrderInfo orderInfo) throws NotValidOrderException {
+        String method = orderInfo.getPaymentMethod();
+        if (method == null || method.isBlank() || !(method.equals("CREDIT_CARD") || method.equals("LOYALTY_POINTS"))) {
+            throw new NotValidOrderException(PAYMENT_METHOD_IS_NOT_VALID);
+        }
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/ReviewDto.java

@@ -0,0 +1,18 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.util.UUID;
+
+@Builder
+@Getter
+@AllArgsConstructor
+public class ReviewDto {
+    private final UUID reviewId;
+    private final String bookId; // Changed from long to String
+    private final String customerName;
+    private final String comment;
+    private final int rating;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/ReviewInfo.java

@@ -0,0 +1,15 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+
+@Builder
+@Getter
+@AllArgsConstructor
+public class ReviewInfo {
+    private final String customerId;
+    private final String isbn; // Changed from long to String
+    private final int rating;
+    private final String comment;
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/converter/ReviewConverter.java

@@ -0,0 +1,28 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.converter;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.review.ReviewDto;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.ReviewInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.entity.Review;
+
+import java.util.UUID;
+
+public class ReviewConverter {
+    public static ReviewDto toDto(Review review, UUID reviewId, String customerName) {
+        return ReviewDto.builder()
+                .reviewId(reviewId)
+                .bookId(review.getIsbn()) // Changed from long to String
+                .customerName(customerName)
+                .comment(review.getComment())
+                .rating(review.getRating())
+                .build();
+    }
+
+    public static Review toDomain(ReviewInfo info) {
+        return Review.builder()
+                .customerId(UUID.fromString(info.getCustomerId()))
+                .isbn(info.getIsbn()) // Changed from long to String
+                .rating(info.getRating())
+                .comment(info.getComment())
+                .build();
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/entity/Review.java

@@ -0,0 +1,20 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.UUID;
+
+@Builder
+@Getter
+@AllArgsConstructor
+@NoArgsConstructor
+public class Review {
+    private UUID customerId;
+    private String isbn; // Changed from long to String
+    private int rating;
+    private String comment;
+
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/exception/InvalidReviewRatingException.java

@@ -0,0 +1,8 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.exception;
+
+public class InvalidReviewRatingException extends RuntimeException {
+    public InvalidReviewRatingException(String message) {
+        super(message);
+    }
+}
+

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/exception/NotValidReviewException.java

@@ -0,0 +1,7 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.exception;
+
+public class NotValidReviewException extends Exception {
+    public NotValidReviewException(String message) {
+        super(message);
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/exception/ReviewAlreadyExistsException.java

@@ -0,0 +1,8 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.exception;
+
+public class ReviewAlreadyExistsException extends RuntimeException {
+    public ReviewAlreadyExistsException(String message) {
+        super(message);
+    }
+}
+

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/exception/ReviewNotFoundException.java

@@ -0,0 +1,8 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.exception;
+
+public class ReviewNotFoundException extends RuntimeException {
+    public ReviewNotFoundException(String message) {
+        super(message);
+    }
+}
+

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/repository/ReviewRepository.java

@@ -0,0 +1,43 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.repository;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.review.entity.Review;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class ReviewRepository {
+    private final List<Review> reviews = new ArrayList<>();
+
+    public void save(Review review) {
+        reviews.add(review);
+    }
+
+    public List<Review> findAll() {
+        return new ArrayList<>(reviews);
+    }
+
+    public List<Review> findByIsbn(String isbn) { // Changed from long to String
+        return reviews.stream().filter(r -> r.getIsbn().equals(isbn)).collect(Collectors.toList());
+    }
+
+    public List<Review> findByCustomerId(UUID customerId) {
+        return reviews.stream().filter(r -> r.getCustomerId().equals(customerId)).collect(Collectors.toList());
+    }
+
+    public boolean existsByCustomerIdAndIsbn(UUID customerId, String isbn) { // Changed from long to String
+        return reviews.stream().anyMatch(r -> r.getCustomerId().equals(customerId) && r.getIsbn().equals(isbn));
+    }
+
+    public void deleteByCustomerIdAndIsbn(UUID customerId, String isbn) { // Changed from long to String
+        reviews.removeIf(r -> r.getCustomerId().equals(customerId) && r.getIsbn().equals(isbn));
+    }
+
+    public void update(Review review) {
+        deleteByCustomerIdAndIsbn(review.getCustomerId(), review.getIsbn());
+        save(review);
+    }
+
+    public void deleteAll() {
+        reviews.clear();
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/usecase/ReviewUseCase.java

@@ -0,0 +1,73 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.usecase;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.entity.Review;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.exception.InvalidReviewRatingException;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.exception.ReviewAlreadyExistsException;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.exception.ReviewNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.CustomerNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.repository.ReviewRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.validator.ReviewValidator;
+
+import java.util.List;
+import java.util.UUID;
+
+public class ReviewUseCase {
+    private final ReviewRepository reviewRepository;
+    private final BookRepository bookRepository;
+    private final CustomerRepository customerRepository;
+
+    public ReviewUseCase(ReviewRepository reviewRepository, BookRepository bookRepository, CustomerRepository customerRepository) {
+        this.reviewRepository = reviewRepository;
+        this.bookRepository = bookRepository;
+        this.customerRepository = customerRepository;
+    }
+
+    public void submitReview(Review review) throws CustomerNotFoundException, BookNotFoundException {
+        ReviewValidator.validate(review);
+
+        System.out.println(bookRepository.existsByISBN(review.getIsbn()));
+        System.out.println(customerRepository.existsById(review.getCustomerId()));
+        System.out.println(customerRepository.findById(review.getCustomerId()));
+        System.out.println(reviewRepository.existsByCustomerIdAndIsbn(review.getCustomerId(), review.getIsbn()));
+
+        if (!bookRepository.existsByISBN(review.getIsbn())) {
+            throw new BookNotFoundException(review.getIsbn());
+        }
+
+        if (!customerRepository.existsById(review.getCustomerId())) {
+            throw new CustomerNotFoundException(review.getCustomerId());
+        }
+
+        if (reviewRepository.existsByCustomerIdAndIsbn(review.getCustomerId(), review.getIsbn())) {
+            throw new ReviewAlreadyExistsException("Review already exists for this customer and book.");
+        }
+
+        reviewRepository.save(review);
+    }
+
+    public List<Review> getReviewsByBook(String isbn) { // Changed from long to String
+        return reviewRepository.findByIsbn(isbn);
+    }
+
+    public List<Review> getReviewsByCustomer(UUID customerId) {
+        return reviewRepository.findByCustomerId(customerId);
+    }
+
+    public void updateReview(Review review) {
+        ReviewValidator.validate(review);
+        if (!reviewRepository.existsByCustomerIdAndIsbn(review.getCustomerId(), review.getIsbn())) { // Changed from long to String
+            throw new ReviewNotFoundException("Review not found for this customer and book.");
+        }
+        reviewRepository.update(review);
+    }
+
+    public void deleteReview(String isbn, UUID customerId) { // Changed from long to String
+        if (!reviewRepository.existsByCustomerIdAndIsbn(customerId, isbn)) { // Changed from long to String
+            throw new ReviewNotFoundException("Review not found for this customer and book.");
+        }
+        reviewRepository.deleteByCustomerIdAndIsbn(customerId, isbn);
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/review/validator/ReviewValidator.java

@@ -0,0 +1,46 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.review.validator;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.review.entity.Review;
+import fr.iut_fbleau.but3.dev62.mylibrary.review.exception.InvalidReviewRatingException;
+
+public class ReviewValidator {
+    public static final String ISBN_IS_NOT_VALID = "ISBN must be a valid 13-digit string";
+
+    public static void validate(Review review) {
+        validateReviewNotNull(review);
+        validateRating(review);
+        validateComment(review);
+        validateCustomerId(review);
+        validateBookIsbn(review);
+    }
+
+    private static void validateReviewNotNull(Review review) throws IllegalArgumentException {
+        if (review == null) {
+            throw new IllegalArgumentException("Review cannot be null");
+        }
+    }
+
+    private static void validateRating(Review review) throws InvalidReviewRatingException {
+        if (review.getRating() < 1 || review.getRating() > 5) {
+            throw new InvalidReviewRatingException("Rating must be between 1 and 5");
+        }
+    }
+
+    private static void validateComment(Review review) throws IllegalArgumentException {
+        if (review.getComment() == null || review.getComment().trim().isEmpty()) {
+            throw new IllegalArgumentException("Comment cannot be empty");
+        }
+    }
+
+    private static void validateCustomerId(Review review) throws IllegalArgumentException {
+        if (review.getCustomerId() == null) {
+            throw new IllegalArgumentException("Customer ID cannot be null");
+        }
+    }
+
+    private static void validateBookIsbn(Review review) throws IllegalArgumentException {
+        if (review.getIsbn() == null || !review.getIsbn().matches("\\d{13}")) {
+            throw new IllegalArgumentException(ISBN_IS_NOT_VALID);
+        }
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/exception/SubscriptionNotFoundException.java

@@ -5,8 +5,9 @@ import java.util.UUID;
 
 public class SubscriptionNotFoundException extends Exception {
 
-    public static final String THE_SUBSCRIPTION_WITH_ID_DOES_NOT_EXIST_MESSAGE = "The customer with id {0} does not exist";
+    public static final String THE_SUBSCRIPTION_WITH_ID_DOES_NOT_EXIST_MESSAGE = "The subscription with id {0} does not exist";
+
     public SubscriptionNotFoundException(UUID uuid) {
-            super(MessageFormat.format(THE_SUBSCRIPTION_WITH_ID_DOES_NOT_EXIST_MESSAGE, uuid));
+        super(MessageFormat.format(THE_SUBSCRIPTION_WITH_ID_DOES_NOT_EXIST_MESSAGE, uuid));
     }
 }

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/repository/SubscriptionRepository.java

@@ -28,6 +28,12 @@ public class SubscriptionRepository {
                 .findFirst();
     }
 
+    public Optional<Subscription> findById(UUID id) {
+        return this.subscriptions.stream()
+                .filter(subscription -> subscription.getId().equals(id))
+                .findFirst();
+    }
+
     public boolean existsById(UUID uuid) {
         return this.subscriptions.stream()
                 .anyMatch(subscription -> subscription.getId().equals(uuid));

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/validator/SubscriptionValidator.java

@@ -17,19 +17,25 @@ public class SubscriptionValidator {
 
     }
 
-    public static void validate(SubscriptionInfo newSubscription) throws fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.NotValidSubscriptionException {
+    public static void validate(SubscriptionInfo newSubscription) throws NotValidSubscriptionException {
+        validateCustomerId(newSubscription);
         validateDuration(newSubscription);
         validatePaymentMethod(newSubscription);
     }
 
-
+    private static void validateCustomerId(SubscriptionInfo newSubscription) throws NotValidSubscriptionException {
-    private static void validateDuration(SubscriptionInfo newSubscription) throws fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.NotValidSubscriptionException {
+        if (newSubscription.customerId() == null) {
-        if (newSubscription.duration() == null) {
+            throw new NotValidSubscriptionException(CUSTOMER_ID_CANNOT_BE_NULL);
-            throw new fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.NotValidSubscriptionException(DURATION_CANNOT_BE_NULL);
         }
     }
 
-    private static void validatePaymentMethod(SubscriptionInfo newSubscription) throws fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.NotValidSubscriptionException {
+    private static void validateDuration(SubscriptionInfo newSubscription) throws NotValidSubscriptionException {
+        if (newSubscription.duration() == null) {
+            throw new NotValidSubscriptionException(DURATION_CANNOT_BE_NULL);
+        }
+    }
+
+    private static void validatePaymentMethod(SubscriptionInfo newSubscription) throws NotValidSubscriptionException {
         if (newSubscription.paymentMethod().isBlank()) {
             throw new NotValidSubscriptionException(PAYMENT_METHOD_CANNOT_BE_BLANK);
         }

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverterTest.java

@@ -0,0 +1,138 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.converter;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.converter.BookConverter;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+@DisplayName("BookConverter Unit Tests")
+public class BookConverterTest {
+
+    @Nested
+    @DisplayName("toDomain() method tests")
+    class ToDomainTests {
+
+        @Test
+        @DisplayName("Should convert BookInfo to Book domain object")
+        void shouldConvertBookInfoToDomain() {
+            // Given
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookInfo = new BookInfo("1234567891234", "Livre", "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            // When
+            Book result = BookConverter.toDomain(bookInfo);
+
+            // Then
+            assertNotNull(result);
+            assertEquals(bookInfo.isbn(), result.getIsbn());
+            assertEquals(bookInfo.title(), result.getTitle());
+            assertEquals(bookInfo.author(), result.getAuthor());
+            assertEquals(bookInfo.publisher(), result.getPublisher());
+            assertEquals(bookInfo.date(), result.getDate());
+            assertEquals(bookInfo.price(), result.getPrice());
+            assertEquals(bookInfo.initialStock(), result.getInitialStock());
+            assertEquals(bookInfo.categories(), result.getCategories());
+            assertEquals(bookInfo.description(), result.getDescription());
+            assertEquals(bookInfo.language(), result.getLanguage());
+        }
+    }
+    @Nested
+    @DisplayName("toDTO() method tests")
+    class ToDTOTests {
+
+        @Test
+        @DisplayName("Should convert Book domain object to BookDTO with all fields mapped correctly")
+        void shouldConvertBookToDTO() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            Book book = Book.builder()
+                    .isbn("1234567890123")
+                    .title("Livre 1")
+                    .author("John Updated")
+                    .publisher("Editeur")
+                    .date(Date.from(Instant.now()))
+                    .price(4.99)
+                    .initialStock(42)
+                    .categories(categories)
+                    .description("Description")
+                    .language("Francais")
+                    .build();
+
+            BookDTO result = BookConverter.toDTO(book);
+
+            assertNotNull(result);
+            assertEquals(book.getIsbn(), result.getIsbn());
+            assertEquals(book.getTitle(), result.getTitle());
+            assertEquals(book.getAuthor(), result.getAuthor());
+            assertEquals(book.getPublisher(), result.getPublisher());
+            assertEquals(book.getDate(), result.getDate());
+            assertEquals(book.getPrice(), result.getPrice());
+            assertEquals(book.getInitialStock(), result.getInitialStock());
+            assertEquals(book.getCategories(), result.getCategories());
+            assertEquals(book.getDescription(), result.getDescription());
+            assertEquals(book.getLanguage(), result.getLanguage());
+        }
+    }
+
+    @Test
+    @DisplayName("Should handle null values properly when converting between objects")
+    void shouldHandleNullValuesGracefully() {
+        Book book = Book.builder()
+                .isbn("1234567890123")
+                .title("Null")
+                .author("Null")
+                .publisher("Null")
+                .date(null)
+                .price(4.99)
+                .initialStock(42)
+                .categories(null)
+                .description(null)
+                .language(null)
+                .build();
+
+        BookDTO result = BookConverter.toDTO(book);
+
+        assertNotNull(result);
+        assertEquals(book.getIsbn(), result.getIsbn());
+        assertEquals(book.getTitle(), result.getTitle());
+        assertEquals(book.getAuthor(), result.getAuthor());
+        assertEquals(book.getPublisher(), result.getPublisher());
+        assertNull(result.getDate());
+        assertEquals(book.getPrice(), result.getPrice());
+        assertEquals(book.getInitialStock(), result.getInitialStock());
+        assertNull(result.getCategories());
+        assertNull(result.getDescription());
+        assertNull(result.getLanguage());
+    }
+
+    @Test
+    @DisplayName("Should preserve empty string values during conversion")
+    void shouldPreserveEmptyStrings() {
+        BookInfo bookInfo = new BookInfo("1234567890123", "e", "e","e",null,1.2,5,null,"","");
+
+        Book domainResult = BookConverter.toDomain(bookInfo);
+        BookDTO result = BookConverter.toDTO(domainResult);
+
+
+        assertEquals(bookInfo.isbn(), result.getIsbn()); //ISBN ne peut pas etre vide
+        assertEquals(bookInfo.title(), result.getTitle()); // Le titre ne peut pas etre vide
+        assertEquals(bookInfo.author(), result.getAuthor()); // L'auteur ne peut pas etre vide
+        assertEquals(bookInfo.publisher(), result.getPublisher()); // L'editeur ne peut pas etre vide
+        assertEquals(null, result.getDate());
+        assertEquals(bookInfo.price(), result.getPrice());
+        assertEquals(bookInfo.initialStock(), result.getInitialStock());
+        assertEquals(null, result.getCategories());
+        assertEquals("", result.getDescription());
+        assertEquals("", result.getLanguage());
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/entity/BookTest.java

@@ -0,0 +1,232 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.entity;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.IllegalBookStockException;
+import io.cucumber.java.bs.A;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.UUID;
+
+class BookTest {
+
+    @Test
+    @DisplayName("Builder should create a valid Book instance")
+    void testBookBuilder() {
+        String ISBN = "1234567890123";
+        String title = "LivreRandom";
+        String author = "John Doe";
+        String publisher = "EditeurRandom";
+        Date date = Date.from(Instant.now());
+        double price = 5.99;
+        int initialStock = 15;
+        ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+        String description = "Je suis un livre qui contient des phrases composees de mots qui sont eux memes composes de lettres faits a partir d'encre sur du papier relie par une couverture cartonnee";
+        String language = "Francais";
+
+        Book book = Book.builder()
+                .isbn(ISBN)
+                .title(title)
+                .author(author)
+                .publisher(publisher)
+                .date(date)
+                .price(price)
+                .initialStock(initialStock)
+                .categories(categories)
+                .description(description)
+                .language(language)
+                .build();
+
+        assertEquals(ISBN, book.getIsbn());
+        assertEquals(title, book.getTitle());
+        assertEquals(author, book.getAuthor());
+        assertEquals(publisher, book.getPublisher());
+        assertEquals(date, book.getDate());
+        assertEquals(price, book.getPrice());
+        assertEquals(initialStock, book.getInitialStock());
+        assertEquals(categories, book.getCategories());
+        assertEquals(description, book.getDescription());
+        assertEquals(language, book.getLanguage());
+    }
+
+
+    @Nested
+    @DisplayName("Book stock Tests")
+    class BookStockTests {
+
+        @Test
+        @DisplayName("addStock should correctly increment stock")
+        void testAddStock() {
+
+            String ISBN = "1234567890123";
+            String title = "LivreRandom";
+            String author = "John Doe";
+            String publisher = "EditeurRandom";
+            Date date = Date.from(Instant.now());
+            double price = 5.99;
+            int initialStock = 50;
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+            String description = "Je suis un livre qui contient des phrases composees de mots qui sont eux memes composes de lettres faits a partir d'encre sur du papier relie par une couverture cartonnee";
+            String language = "Francais";
+            Book book = Book.builder()
+                    .isbn(ISBN)
+                    .title(title)
+                    .author(author)
+                    .publisher(publisher)
+                    .date(date)
+                    .price(price)
+                    .initialStock(initialStock)
+                    .categories(categories)
+                    .description(description)
+                    .language(language)
+                    .build();
+            int stockToAdd = 25;
+            int expectedStock = 75;
+
+            book.addStock(stockToAdd);
+
+            assertEquals(expectedStock, book.getInitialStock());
+        }
+
+        @Test
+        @DisplayName("addStock should handle zero points correctly")
+        void testAddZeroStock() {
+            String ISBN = "1234567890123";
+            String title = "LivreRandom";
+            String author = "John Doe";
+            String publisher = "EditeurRandom";
+            Date date = Date.from(Instant.now());
+            double price = 5.99;
+            int initialStock = 50;
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+            String description = "Je suis un livre qui contient des phrases composees de mots qui sont eux memes composes de lettres faits a partir d'encre sur du papier relie par une couverture cartonnee";
+            String language = "Francais";
+            Book book = Book.builder()
+                    .isbn(ISBN)
+                    .title(title)
+                    .author(author)
+                    .publisher(publisher)
+                    .date(date)
+                    .price(price)
+                    .initialStock(initialStock)
+                    .categories(categories)
+                    .description(description)
+                    .language(language)
+                    .build();
+
+            book.addStock(0);
+
+            assertEquals(50, book.getInitialStock());
+        }
+
+        @Test
+        @DisplayName("removeStock should correctly decrement  points")
+        void testRemoveStock() throws IllegalBookStockException {
+            String ISBN = "1234567890123";
+            String title = "LivreRandom";
+            String author = "John Doe";
+            String publisher = "EditeurRandom";
+            Date date = Date.from(Instant.now());
+            double price = 5.99;
+            int initialStock = 50;
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+            String description = "Je suis un livre qui contient des phrases composees de mots qui sont eux memes composes de lettres faits a partir d'encre sur du papier relie par une couverture cartonnee";
+            String language = "Francais";
+            Book book = Book.builder()
+                    .isbn(ISBN)
+                    .title(title)
+                    .author(author)
+                    .publisher(publisher)
+                    .date(date)
+                    .price(price)
+                    .initialStock(initialStock)
+                    .categories(categories)
+                    .description(description)
+                    .language(language)
+                    .build();
+            int stockToRemove = 20;
+            int expectedStock = 30;
+
+            book.removeStock(stockToRemove);
+
+            assertEquals(expectedStock, book.getInitialStock());
+        }
+
+        @Test
+        @DisplayName("removeStock should throw exception when trying to remove more points than available")
+        void testRemoveTooManyStock() {
+            String ISBN = "1234567890123";
+            String title = "LivreRandom";
+            String author = "John Doe";
+            String publisher = "EditeurRandom";
+            Date date = Date.from(Instant.now());
+            double price = 5.99;
+            int initialStock = 50;
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+            String description = "Je suis un livre qui contient des phrases composees de mots qui sont eux memes composes de lettres faits a partir d'encre sur du papier relie par une couverture cartonnee";
+            String language = "Francais";
+            Book book = Book.builder()
+                    .isbn(ISBN)
+                    .title(title)
+                    .author(author)
+                    .publisher(publisher)
+                    .date(date)
+                    .price(price)
+                    .initialStock(initialStock)
+                    .categories(categories)
+                    .description(description)
+                    .language(language)
+                    .build();
+            int pointsToRemove = 75;
+
+            IllegalBookStockException exception = assertThrows(
+                    IllegalBookStockException.class,
+                    () -> book.removeStock(pointsToRemove)
+            );
+
+            assertEquals(50, book.getInitialStock());
+            assertTrue(exception.getMessage().contains(String.valueOf(pointsToRemove)));
+            assertTrue(exception.getMessage().contains(String.valueOf(book.getInitialStock())));
+        }
+
+        @Test
+        @DisplayName("removeStock should handle removing zero points correctly")
+        void testRemoveZeroStock() throws IllegalBookStockException {
+            String ISBN = "1234567890123";
+            String title = "LivreRandom";
+            String author = "John Doe";
+            String publisher = "EditeurRandom";
+            Date date = Date.from(Instant.now());
+            double price = 5.99;
+            int initialStock = 50;
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+            String description = "Je suis un livre qui contient des phrases composees de mots qui sont eux memes composes de lettres faits a partir d'encre sur du papier relie par une couverture cartonnee";
+            String language = "Francais";
+            Book book = Book.builder()
+                    .isbn(ISBN)
+                    .title(title)
+                    .author(author)
+                    .publisher(publisher)
+                    .date(date)
+                    .price(price)
+                    .initialStock(initialStock)
+                    .categories(categories)
+                    .description(description)
+                    .language(language)
+                    .build();
+
+            book.removeStock(0);
+
+            assertEquals(50, book.getInitialStock());
+        }
+
+    }
+
+
+
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/exception/BookNotFoundExceptionTest.java

@@ -0,0 +1,60 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.exception;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.Random;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class BookNotFoundExceptionTest {
+
+    private String randomISBN(){
+        Random r = new Random();
+        String ret = "";
+        for(int i=0;i<13;i++){
+            int e = r.nextInt()%10;
+            ret = ret + e;
+        }
+        return ret;
+    }
+
+    @Test
+    @DisplayName("Exception message should contain the UUID provided")
+    void testExceptionMessageContainsISBN() {
+        String ISBN = randomISBN();
+
+        BookNotFoundException exception = new BookNotFoundException(ISBN);
+
+        String expectedMessage = String.format("The book with ISBN %s does not exist", ISBN);
+        assertEquals(expectedMessage, exception.getMessage());
+    }
+
+    @Test
+    @DisplayName("Exception should use the correct constant message format")
+    void testExceptionUsesConstantMessageFormat() {
+        String ISBN = randomISBN();
+
+        BookNotFoundException exception = new BookNotFoundException(ISBN);
+
+        String expectedFormatWithPlaceholder = "The book with ISBN {0} does not exist";
+        assertEquals(BookNotFoundException.THE_BOOK_WITH_ISBN_DOES_NOT_EXIST_MESSAGE,
+                expectedFormatWithPlaceholder);
+        assertTrue(exception.getMessage().contains(ISBN));
+    }
+
+    @Test
+    @DisplayName("Exception should be properly thrown and caught")
+    void testExceptionCanBeThrownAndCaught() {
+        String ISBN = randomISBN();
+
+        try {
+            throw new BookNotFoundException(ISBN);
+        } catch (BookNotFoundException e) {
+            String expectedMessage = String.format("The book with ISBN %s does not exist", ISBN);
+            assertEquals(expectedMessage, e.getMessage());
+        }
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/exception/IllegalBookStockExceptionTest.java

@@ -0,0 +1,71 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.exception;
+
+import java.text.MessageFormat;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.IllegalBookStockException;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class IllegalBookStockExceptionTest {
+
+    @Test
+    @DisplayName("Exception message should contain the needed and actual stock")
+    void testExceptionMessageContainsStock() {
+        int neededStock = 100;
+        int actualStock = 50;
+
+        IllegalBookStockException exception = new IllegalBookStockException(neededStock, actualStock);
+
+        String expectedMessage = "Cannot remove 100 stock from 50 stock";
+        assertEquals(expectedMessage, exception.getMessage());
+    }
+
+    @ParameterizedTest
+    @CsvSource({
+            "100, 50",
+            "75, 25",
+            "200, 150",
+            "1000, 750"
+    })
+    @DisplayName("Exception message should be formatted correctly for different stock values")
+    void testExceptionMessageForDifferentStockValues(int neededStock, int actualStock) {
+        IllegalBookStockException exception = new IllegalBookStockException(neededStock, actualStock);
+
+        String expectedMessage = MessageFormat.format(IllegalBookStockException.CANNOT_REMOVE_STOCK, neededStock, actualStock);
+        assertEquals(expectedMessage, exception.getMessage());
+    }
+
+    @Test
+    @DisplayName("Exception should use the correct constant message format")
+    void testExceptionUsesConstantMessageFormat() {
+        int neededStock = 100;
+        int actualStock = 50;
+
+        IllegalBookStockException exception = new IllegalBookStockException(neededStock, actualStock);
+
+        String expectedFormatWithPlaceholder = "Cannot remove {0} stock from {1} stock";
+        assertEquals(IllegalBookStockException.CANNOT_REMOVE_STOCK,
+                expectedFormatWithPlaceholder);
+        assertTrue(exception.getMessage().contains(String.valueOf(neededStock)));
+        assertTrue(exception.getMessage().contains(String.valueOf(actualStock)));
+    }
+
+    @Test
+    @DisplayName("Exception should be properly thrown and caught")
+    void testExceptionCanBeThrownAndCaught() {
+        int neededStock = 100;
+        int actualStock = 50;
+
+        try {
+            throw new IllegalBookStockException(neededStock, actualStock);
+        } catch (IllegalBookStockException e) {
+            String expectedMessage = String.format("Cannot remove %d stock from %d stock", neededStock, actualStock);
+            assertEquals(expectedMessage, e.getMessage());
+        }
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/exception/NotValidBookExceptionTest.java

@@ -0,0 +1,63 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.exception;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class NotValidBookExceptionTest {
+
+    @Test
+    @DisplayName("Exception should be created with the provided message")
+    void testExceptionCreation() {
+        String errorMessage = "Customer data is not valid";
+
+        NotValidBookException exception = new NotValidBookException(errorMessage);
+
+        assertEquals(errorMessage, exception.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "ISBN format is invalid",
+            "Title cannot be empty",
+            "Author cannot be empty",
+            "Publisher cannot be empty",
+            "Price needs to be positive",
+            "Stock cannot go below 0",
+    })
+    @DisplayName("Exception should handle different validation messages")
+    void testExceptionWithDifferentMessages(String errorMessage) {
+        NotValidBookException exception = new NotValidBookException(errorMessage);
+
+        assertEquals(errorMessage, exception.getMessage());
+    }
+
+    @Test
+    @DisplayName("Exception should be properly thrown and caught")
+    void testExceptionCanBeThrownAndCaught() {
+        String errorMessage = "Required field is missing";
+
+        Exception exception = assertThrows(NotValidBookException.class, () -> {
+            throw new NotValidBookException(errorMessage);
+        });
+
+        assertEquals(errorMessage, exception.getMessage());
+    }
+
+    @Test
+    @DisplayName("Exception should be catchable as a general Exception")
+    void testExceptionInheritance() {
+        String errorMessage = "Invalid book data";
+
+        try {
+            throw new NotValidBookException(errorMessage);
+        } catch (Exception e) {
+            assertEquals(NotValidBookException.class, e.getClass());
+            assertEquals(errorMessage, e.getMessage());
+        }
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/repository/BookRepositoryTest.java

@@ -0,0 +1,262 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.repository;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class BookRepositoryTest {
+
+    private BookRepository repository;
+    private Book book1;
+    private Book book2;
+
+    @BeforeEach
+    void setUp() {
+        repository = new BookRepository();
+        ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+
+        book1 = Book.builder()
+                .isbn("1234567890123")
+                .title("Livre 1")
+                .author("John Doe")
+                .publisher("Editeur")
+                .date(Date.from(Instant.now()))
+                .price(5.99)
+                .initialStock(50)
+                .categories(categories)
+                .description("Description")
+                .language("Francais")
+                .build();
+
+        book2 = Book.builder()
+                .isbn("3210987654321")
+                .title("Livre 2")
+                .author("Jane Smith")
+                .publisher("Editeur")
+                .date(Date.from(Instant.now()))
+                .price(8.54)
+                .initialStock(42)
+                .categories(categories)
+                .description("Description")
+                .language("Francais")
+                .build();
+    }
+
+    @Test
+    @DisplayName("New repository should be empty")
+    void testNewRepositoryIsEmpty() {
+        List<Book> books = repository.findAll();
+
+        assertTrue(books.isEmpty());
+        assertEquals(0, books.size());
+    }
+
+    @Nested
+    @DisplayName("Save operations")
+    class SaveOperations {
+
+        @Test
+        @DisplayName("Save should add a new book")
+        void testSaveNewBook() {
+            Book savedBook = repository.save(book1);
+
+            assertEquals(1, repository.findAll().size());
+            assertEquals(book1.getIsbn(), savedBook.getIsbn());
+            assertEquals(book1.getTitle(), savedBook.getTitle());
+            assertEquals(book1.getAuthor(), savedBook.getAuthor());
+            assertEquals(book1.getPublisher(), savedBook.getPublisher());
+            assertEquals(book1.getDate(), savedBook.getDate());
+            assertEquals(book1.getPrice(), savedBook.getPrice());
+            assertEquals(book1.getInitialStock(), savedBook.getInitialStock());
+            assertEquals(book1.getCategories(), savedBook.getCategories());
+            assertEquals(book1.getDescription(), savedBook.getDescription());
+            assertEquals(book1.getLanguage(), savedBook.getLanguage());
+        }
+
+        @Test
+        @DisplayName("Save should update existing book with same ISBN")
+        void testSaveUpdatesExistingBook() {
+            repository.save(book1);
+
+            String isbn = book1.getIsbn();
+            ArrayList<String> categories = book1.getCategories();
+            Book updatedBook = Book.builder()
+                    .isbn(isbn)
+                    .title("Livre 1")
+                    .author("John Updated")
+                    .publisher("Editeur")
+                    .date(Date.from(Instant.now()))
+                    .price(4.99)
+                    .initialStock(42)
+                    .categories(categories)
+                    .description("Description")
+                    .language("Francais")
+                    .build();
+
+            Book savedBook = repository.save(updatedBook);
+
+            assertEquals(1, repository.findAll().size());
+            assertEquals(updatedBook.getIsbn(), savedBook.getIsbn());
+            assertEquals(updatedBook.getTitle(), savedBook.getTitle());
+            assertEquals(updatedBook.getAuthor(), savedBook.getAuthor());
+            assertEquals(updatedBook.getPublisher(), savedBook.getPublisher());
+            assertEquals(updatedBook.getDate(), savedBook.getDate());
+            assertEquals(updatedBook.getPrice(), savedBook.getPrice());
+            assertEquals(updatedBook.getInitialStock(), savedBook.getInitialStock());
+            assertEquals(updatedBook.getCategories(), savedBook.getCategories());
+            assertEquals(updatedBook.getDescription(), savedBook.getDescription());
+            assertEquals(updatedBook.getLanguage(), savedBook.getLanguage());
+        }
+
+        @Test
+        @DisplayName("Save multiple books should add all of them")
+        void testSaveMultipleBooks() {
+            repository.save(book1);
+            repository.save(book2);
+
+            List<Book> books = repository.findAll();
+
+            assertEquals(2, books.size());
+            assertTrue(books.contains(book1));
+            assertTrue(books.contains(book2));
+        }
+    }
+
+    @Nested
+    @DisplayName("Find operations")
+    class FindOperations {
+
+        @BeforeEach
+        void setUpBooks() {
+            repository.save(book1);
+            repository.save(book2);
+        }
+
+        @Test
+        @DisplayName("FindAll should return all books")
+        void testFindAll() {
+            List<Book> books = repository.findAll();
+
+            assertEquals(2, books.size());
+            assertTrue(books.contains(book1));
+            assertTrue(books.contains(book2));
+        }
+
+        @Test
+        @DisplayName("FindById should return book with matching ID")
+        void testFindById() {
+            Optional<Book> foundBook = repository.findByISBN(book1.getIsbn());
+
+            assertTrue(foundBook.isPresent());
+            assertEquals(book1.getIsbn(), foundBook.get().getIsbn());
+            assertEquals(book1.getTitle(), foundBook.get().getTitle());
+            assertEquals(book1.getAuthor(), foundBook.get().getAuthor());
+            assertEquals(book1.getPublisher(), foundBook.get().getPublisher());
+            assertEquals(book1.getDate(), foundBook.get().getDate());
+            assertEquals(book1.getPrice(), foundBook.get().getPrice());
+            assertEquals(book1.getInitialStock(), foundBook.get().getInitialStock());
+            assertEquals(book1.getCategories(), foundBook.get().getCategories());
+            assertEquals(book1.getDescription(), foundBook.get().getDescription());
+            assertEquals(book1.getLanguage(), foundBook.get().getLanguage());
+        }
+
+        @Test
+        @DisplayName("FindById should return empty Optional when ID doesn't exist")
+        void testFindByIdNotFound() {
+            String nonExistentISBN = "1115553331112";
+
+            Optional<Book> foundBook = repository.findByISBN(nonExistentISBN);
+
+            assertTrue(foundBook.isEmpty());
+        }
+
+        @Test
+        @DisplayName("FindByISBN should return book with matching ISBN")
+        void testFindByISBN() {
+            Optional<Book> foundBook = repository.findByISBN("1234567890123");
+
+            assertTrue(foundBook.isPresent());
+            assertEquals(book1.getIsbn(), foundBook.get().getIsbn());
+            assertEquals(book1.getTitle(), foundBook.get().getTitle());
+            assertEquals(book1.getAuthor(), foundBook.get().getAuthor());
+            assertEquals(book1.getPublisher(), foundBook.get().getPublisher());
+            assertEquals(book1.getDate(), foundBook.get().getDate());
+            assertEquals(book1.getPrice(), foundBook.get().getPrice());
+            assertEquals(book1.getInitialStock(), foundBook.get().getInitialStock());
+            assertEquals(book1.getCategories(), foundBook.get().getCategories());
+            assertEquals(book1.getDescription(), foundBook.get().getDescription());
+            assertEquals(book1.getLanguage(), foundBook.get().getLanguage());
+        }
+
+        @Test
+        @DisplayName("FindByISBN should return empty Optional when ISBN doesn't exist")
+        void testFindByISBNNotFound() {
+            Optional<Book> foundBook = repository.findByISBN("0000000000000");
+
+            assertTrue(foundBook.isEmpty());
+        }
+    }
+
+    @Nested
+    @DisplayName("Delete operations")
+    class DeleteOperations {
+
+        @BeforeEach
+        void setUpBooks() {
+            repository.save(book1);
+            repository.save(book2);
+        }
+
+        @Test
+        @DisplayName("Delete should remove the specified book")
+        void testDelete() {
+            repository.delete(book1);
+
+            List<Book> books = repository.findAll();
+
+            assertEquals(1, books.size());
+            assertFalse(books.contains(book1));
+            assertTrue(books.contains(book2));
+        }
+
+        @Test
+        @DisplayName("DeleteAll should remove all books")
+        void testDeleteAll() {
+            repository.deleteAll();
+
+            List<Book> books = repository.findAll();
+
+            assertTrue(books.isEmpty());
+            assertEquals(0, books.size());
+        }
+
+        @Test
+        @DisplayName("Delete should not throw exception when book doesn't exist")
+        void testDeleteNonExistentBook() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+            Book nonExistentBook = Book.builder()
+                    .isbn("0000000000000")
+                    .title("Livre Non existant")
+                    .author("John Doe")
+                    .publisher("Editeur")
+                    .date(Date.from(Instant.now()))
+                    .price(5.99)
+                    .initialStock(50)
+                    .categories(categories)
+                    .description("Description")
+                    .language("Francais")
+                    .build();
+
+            assertDoesNotThrow(() -> repository.delete(nonExistentBook));
+
+            assertEquals(2, repository.findAll().size());
+        }
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/usecase/BookUseCaseTest.java

@@ -1,5 +1,12 @@
 package fr.iut_fbleau.but3.dev62.mylibrary.book.usecase;
 
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.converter.BookConverter;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
@@ -9,6 +16,10 @@ import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 
+import javax.swing.text.html.Option;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Date;
 import java.util.Optional;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -32,21 +43,22 @@ public class BookUseCaseTest {
 
     @BeforeEach
     void setUp() {
-
+        ArrayList<String> categories = new ArrayList<>(); categories.add("Histoire"); categories.add("Action");
+        Date date = Date.from(Instant.now());
         testBook = Book.builder()
-                .isbn(bookISBN)
+                .isbn("1234567890123")
                 .title("LivreRandom")
                 .author("John Doe")
                 .publisher("RandomPublisher")
-                .publicationDate(date)
+                .date(date)
                 .price(12.5)
                 .initialStock(50)
-                .categories(cat)
+                .categories(categories)
                 .description("Je suis un livre qui est composé de mots.")
                 .language("Francais")
                 .build();
 
-        validBookInfo = new BookInfo("LivreRandom", "John Doe", "RandomPublisher", date, 12.5, 50, cat, "Je suis un livre qui est composé de mots.", "Francais");
+        validBookInfo = new BookInfo("1234567890123","LivreRandom", "John Doe", "RandomPublisher", date, 12.5, 50, categories, "Je suis un livre qui est composé de mots.", "Francais");
     }
 
 
@@ -58,9 +70,10 @@ public class BookUseCaseTest {
         @Test
         @DisplayName("Should register book when valid data is provided")
         void testRegisterBookWithValidData() throws NotValidBookException {
-            when(BookRepository.save(any(Book.class))).thenReturn(testBook);
+            bookISBN = "1234567890123";
+            when(bookRepository.save(any(Book.class))).thenReturn(testBook);
 
-            String registeredISBN = BookUseCase.registerBook(validBookInfo);
+            String registeredISBN = bookUseCase.registerBook(validBookInfo);
 
             assertNotNull(registeredISBN);
             assertEquals(bookISBN, registeredISBN);
@@ -70,7 +83,7 @@ public class BookUseCaseTest {
         @Test
         @DisplayName("Should throw exception when book data is not valid")
         void testRegisterBookWithInvalidData() {
-            BookInfo invalidBookInfo = new BookInfo("", "", "");
+            BookInfo invalidBookInfo = new BookInfo("", "", "", "", Date.from(Instant.now()),-78, -1, null, "", "");
 
             assertThrows(NotValidBookException.class,
                     () -> bookUseCase.registerBook(invalidBookInfo));
@@ -90,15 +103,17 @@ public class BookUseCaseTest {
 
         @Test
         @DisplayName("Should return book when ISBN exists")
-        void testFindBookByISBN() {
+        void testFindBookByISBN() throws NotValidBookException {
-            when(BookRepository.findBookByISBN("1234567890123")).thenReturn(Optional.of(testISBN));
+            when(bookRepository.findByISBN("1234567890123")).thenReturn(Optional.of(testBook));
+
+            String registeredISBN = bookUseCase.registerBook(validBookInfo);
 
             Optional<BookDTO> foundBook = bookUseCase.findBookByISBN("1234567890123");
 
             assertTrue(foundBook.isPresent());
-            assertEquals(testBook.getISBN(), foundBook.get().getISBN());
+            assertEquals(testBook.getIsbn(), foundBook.get().getIsbn());
-            assertEquals(testBook.getName(), foundBook.get().getName());
+            assertEquals(testBook.getTitle(), foundBook.get().getTitle());
-            verify(bookRepository, times(1)).findBookByISBN("1234567890123");
+            verify(bookRepository, times(1)).findByISBN("1234567890123");
         }
 
         @Test
@@ -124,16 +139,16 @@ public class BookUseCaseTest {
             when(bookRepository.findByISBN(bookISBN)).thenReturn(Optional.of(testBook));
             doNothing().when(bookRepository).delete(testBook);
 
-            bookUseCase.deleteBook(bookId);
+            bookUseCase.deleteBook(bookISBN);
 
-            verify(bookRepository, times(1)).findByISBN(bookId);
+            verify(bookRepository, times(1)).findByISBN(bookISBN);
             verify(bookRepository, times(1)).delete(testBook);
         }
 
         @Test
         @DisplayName("Should throw exception when book ISBN doesn't exist")
         void testDeleteBookNotFound() {
-            ISBN nonExistentId = ISBN.randomISBN();
+            String nonExistentISBN = "0000000000001";
             when(bookRepository.findByISBN(nonExistentISBN)).thenReturn(Optional.empty());
 
             assertThrows(BookNotFoundException.class,

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/validator/BookValidatorTest.java

@@ -0,0 +1,244 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.validator;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.NotValidCustomerException;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Date;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class BookValidatorTest {
+
+    @Test
+    @DisplayName("Should validate book with valid data")
+    void testValidateValidBook() {
+        ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+        BookInfo validBook = new BookInfo("1234567891234", "Livre", "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+        assertDoesNotThrow(() -> BookValidator.validate(validBook));
+    }
+
+    @Nested
+    @DisplayName("ISBN validation tests")
+    class ISBNValidationTests {
+
+        @Test
+        @DisplayName("Should throw exception when ISBN is blank")
+        void testValidateBlankISBN() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankISBN = new BookInfo("", "Livre", "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankISBN)
+            );
+
+            assertEquals(BookValidator.ISBN_CANNOT_BE_BLANK, exception.getMessage());
+        }
+
+        @ParameterizedTest
+        @ValueSource(strings = {" ", "  ", "\t", "\n"})
+        @DisplayName("Should throw exception when ISBN contains only whitespace")
+        void testValidateWhitespaceISBN(String whitespace) {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithWhitespaceISBN = new BookInfo(whitespace, "Livre", "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithWhitespaceISBN)
+            );
+
+            assertEquals(BookValidator.ISBN_CANNOT_BE_BLANK, exception.getMessage());
+        }
+
+        @ParameterizedTest
+        @ValueSource(strings = {"hfoahdiehfyui", "123456789 0123", "123", "12345678901234","123456789 123"})
+        @DisplayName("Should throw exception when ISBN is not a valid format")
+        void testValidateNotValidISBN(String testedISBN) {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithInvalidISBN = new BookInfo(testedISBN, "Livre", "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithInvalidISBN)
+            );
+
+            assertEquals(BookValidator.ISBN_IS_NOT_VALID, exception.getMessage());
+        }
+
+    }
+
+
+    @Nested
+    @DisplayName("Title validation tests")
+    class TitleValidationTests {
+
+        @Test
+        @DisplayName("Should throw exception when Title is blank")
+        void testValidateBlankTitle() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankTitle = new BookInfo("1234567890123", "", "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankTitle)
+            );
+
+            assertEquals(BookValidator.TITLE_CANNOT_BE_BLANK, exception.getMessage());
+        }
+
+        @ParameterizedTest
+        @ValueSource(strings = {" ", "  ", "\t", "\n"})
+        @DisplayName("Should throw exception when Title contains only whitespace")
+        void testValidateWhitespaceTitle(String whitespace) {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankTitle = new BookInfo("1234567890123", whitespace, "john doe","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankTitle)
+            );
+
+            assertEquals(BookValidator.TITLE_CANNOT_BE_BLANK, exception.getMessage());
+        }
+    }
+
+
+    @Nested
+    @DisplayName("Author validation tests")
+    class AuthorValidationTests {
+
+        @Test
+        @DisplayName("Should throw exception when Author is blank")
+        void testValidateBlankAuthor() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankAuthor = new BookInfo("1234567890123", "Livre", "","editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankAuthor)
+            );
+
+            assertEquals(BookValidator.AUTHOR_CANNOT_BE_BLANK, exception.getMessage());
+        }
+
+        @ParameterizedTest
+        @ValueSource(strings = {" ", "  ", "\t", "\n"})
+        @DisplayName("Should throw exception when Author contains only whitespace")
+        void testValidateWhitespaceAuthor(String whitespace) {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankAuthor = new BookInfo("1234567890123", "Livre", whitespace,"editeur", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankAuthor)
+            );
+
+            assertEquals(BookValidator.AUTHOR_CANNOT_BE_BLANK, exception.getMessage());
+        }
+    }
+
+
+    @Nested
+    @DisplayName("Publisher validation tests")
+    class PublisherValidationTests {
+
+        @Test
+        @DisplayName("Should throw exception when Publisher is blank")
+        void testValidateBlankPublisher() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankPublisher = new BookInfo("1234567890123", "Livre", "Auteur","", Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankPublisher)
+            );
+
+            assertEquals(BookValidator.PUBLISHER_CANNOT_BE_BLANK, exception.getMessage());
+        }
+
+        @ParameterizedTest
+        @ValueSource(strings = {" ", "  ", "\t", "\n"})
+        @DisplayName("Should throw exception when Publisher contains only whitespace")
+        void testValidateWhitespacePublisher(String whitespace) {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithBlankPublisher = new BookInfo("1234567890123", "Livre", "Auteur",whitespace, Date.from(Instant.now()),5.99,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithBlankPublisher)
+            );
+
+            assertEquals(BookValidator.PUBLISHER_CANNOT_BE_BLANK, exception.getMessage());
+        }
+    }
+
+
+    @Nested
+    @DisplayName("Price validation tests")
+    class PriceValidationTests {
+
+        @Test
+        @DisplayName("Should throw exception when Price is negative")
+        void testValidateNegativePrice() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithNegativePrice = new BookInfo("1234567890123", "Livre", "Auteur","Editeur", Date.from(Instant.now()),-4.98,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithNegativePrice)
+            );
+
+            assertEquals(BookValidator.PRICE_CANNOT_BE_NEGATIVE, exception.getMessage());
+        }
+
+        @Test
+        @DisplayName("Should throw exception when Price is equal to zero")
+        void testValidatePriceEqualToZero() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithPriceEqualToZero = new BookInfo("1234567890123", "Livre", "Auteur","Editeur", Date.from(Instant.now()),0,15,categories,"description","langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithPriceEqualToZero)
+            );
+
+            assertEquals(BookValidator.PRICE_CANNOT_BE_EQUAL_TO_ZERO, exception.getMessage());
+        }
+
+
+    }
+
+    @Nested
+    @DisplayName("Initial Stock validation tests")
+    class InitialStockValidationTests {
+
+        @Test
+        @DisplayName("Should throw exception when Initial Stock is negative")
+        void testValidateNegativeStock() {
+            ArrayList<String> categories = new ArrayList<>(); categories.add("Categorie1"); categories.add("Categorie2");
+            BookInfo bookWithNegativeInitialStock = new BookInfo("1234567890123", "Livre", "Auteur", "Editeur", Date.from(Instant.now()), 5.12, -15, categories, "description", "langue");
+
+            NotValidBookException exception = assertThrows(
+                    NotValidBookException.class,
+                    () -> BookValidator.validate(bookWithNegativeInitialStock)
+            );
+
+            assertEquals(BookValidator.INITIAL_STOCK_CANNOT_BE_NEGATIVE, exception.getMessage());
+        }
+
+    }
+
+
+
+
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/client/CustomerSteps.java

@@ -220,4 +220,5 @@ public class CustomerSteps {
     assertEquals(errorMessage, illegalCustomerPointException.getMessage());
   }
 
+
 }

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/livre/BookSteps.java

@@ -0,0 +1,222 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.features.livre;
+
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundExceptionTest;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.usecase.BookUseCase;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.NotValidCustomerException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.usecase.CustomerUseCase;
+import io.cucumber.datatable.DataTable;
+import io.cucumber.java.ParameterType;
+import io.cucumber.java.en.And;
+import io.cucumber.java.en.Given;
+import io.cucumber.java.en.Then;
+import io.cucumber.java.en.When;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.util.*;
+
+
+public class BookSteps {
+
+    private final Map<String, String> bookISBN = new HashMap<>();
+    private final BookRepository bookRepository = new BookRepository();
+    private final BookUseCase bookUseCase = new BookUseCase(bookRepository);
+    private String bookRegistration;
+    private Book updatedBook;
+    private Optional<BookDTO> bookByISBN;
+    private NotValidBookException notValidBookException;
+    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-mm-dd", Locale.ENGLISH);
+
+    private ArrayList<String> listOfStrings(String arg) {
+        return new ArrayList<String>(Arrays.asList(arg.split(",\\s")));
+    }
+
+
+
+    @Given("le systeme possedent les livres suivants :")
+    public void theSystemHasTheFollowingBooks(DataTable dataTable) throws ParseException {
+        int size = bookRepository.findAll().size();
+
+        if (size > 0) {
+            bookRepository.deleteAll();
+        }
+
+        List<Map<String, String>> books = dataTable.asMaps(String.class, String.class);
+
+        for (Map<String, String> book : books) {
+            String ISBN = book.get("ISBN");
+            Book newBook = Book.builder()
+                    .isbn(ISBN)
+                    .title(book.get("titre"))
+                    .author(book.get("auteur"))
+                    .publisher(book.get("editeur"))
+                    .date(formatter.parse(book.get("datePublication")))
+                    .price(Double.parseDouble(book.get("prix")))
+                    .initialStock(Integer.parseInt(book.get("stockInitial")))
+                    .categories(listOfStrings(book.get("categories")))
+                    .description(book.get("description"))
+                    .language(book.get("langue"))
+                    .build();
+            Book save = bookRepository.save(newBook);
+            bookISBN.put(ISBN, save.getIsbn());
+        }
+
+        assertEquals(books.size(), bookRepository.findAll().size());
+    }
+
+    @When("Je cree un nouveau livre avec les informations suivantes :")
+    public void iCreateANewBookWithTheFollowingInformation(DataTable dataTable) throws NotValidBookException, ParseException {
+        List<Map<String, String>> rows = dataTable.asMaps(String.class, String.class);
+
+        Map<String, String> bookInfo = rows.getFirst();
+
+
+        BookInfo newBook = new BookInfo(
+                bookInfo.get("ISBN"),
+                bookInfo.get("titre"),
+                bookInfo.get("auteur"),
+                bookInfo.get("editeur"),
+                formatter.parse(bookInfo.get("datePublication")),
+                Double.parseDouble(bookInfo.get("prix")),
+                Integer.parseInt(bookInfo.get("stockInitial")),
+                listOfStrings(bookInfo.get("categories")),
+                bookInfo.get("description"),
+                bookInfo.get("langue")
+        );
+
+        bookRegistration = bookUseCase.registerBook(newBook);
+    }
+
+
+
+    @Then("Un nouveau livre est cree")
+    public void aNewBookIsCreated(){
+        assertNotNull(bookRegistration);
+    }
+
+    @When("Je modifie le livre avec l'ISBN {string} avec les informations suivantes:")
+    public void iUpdateABookWithTheFollowingInformation(String isbn, DataTable dataTable) throws BookNotFoundException, NotValidBookException, ParseException {
+        List<Map<String, String>> rows = dataTable.asMaps(String.class, String.class);
+
+        Map<String, String> bookData = rows.getFirst();
+        BookInfo bookInfo = new BookInfo(
+                bookData.get("ISBN"),
+                bookData.get("titre"),
+                bookData.get("auteur"),
+                bookData.get("editeur"),
+                formatter.parse(bookData.get("datePublication")),
+                Double.parseDouble(bookData.get("prix")),
+                Integer.parseInt(bookData.get("stockInitial")),
+                listOfStrings(bookData.get("categories")),
+                bookData.get("description"),
+                bookData.get("langue")
+        );
+        bookUseCase.updateBook(isbn, bookInfo);
+
+    }
+
+    @Then("Le livre {string} a les informations suivantes:")
+    public void theBookHasFollowingInformations(String isbn, DataTable dataTable) throws ParseException {
+        List<Map<String, String>> rows = dataTable.asMaps(String.class, String.class);
+
+        Map<String, String> updatedData = rows.getFirst();
+
+
+        updatedBook = bookRepository.findByISBN(isbn).orElseThrow();
+        assertEquals(updatedData.get("ISBN"), updatedBook.getIsbn());
+        assertEquals(updatedData.get("titre"), updatedBook.getTitle());
+        assertEquals(updatedData.get("auteur"), updatedBook.getAuthor());
+        assertEquals(updatedData.get("editeur"), updatedBook.getPublisher());
+        assertEquals(formatter.parse(updatedData.get("datePublication")), updatedBook.getDate());
+        assertEquals(Double.parseDouble(updatedData.get("prix")), updatedBook.getPrice());
+        assertEquals(Integer.parseInt(updatedData.get("stockInitial")), updatedBook.getInitialStock());
+        assertEquals(listOfStrings(updatedData.get("categories")), updatedBook.getCategories());
+        assertEquals(updatedData.get("description"), updatedBook.getDescription());
+        assertEquals(updatedData.get("langue"), updatedBook.getLanguage());
+    }
+
+    @When("Je supprime le livre avec l'ISBN {string}")
+    public void iDeleteTheFollowingBook(String isbn) throws BookNotFoundException {
+        bookUseCase.deleteBook(isbn);
+    }
+
+    @Then("Le livre {string} n'existe plus dans le systeme")
+    public void theBookDoesNotExistInTheSystem(String isbn){
+        assertFalse(bookRepository.existsByISBN(isbn));
+    }
+
+    @And("Le systeme contient {int} livre")
+    public void theSystemContainsThisMuchBooks(int nBooks){
+        assertEquals(nBooks,bookRepository.findAll().size());
+    }
+
+    @When("Je demande les informations du lirve avec l'ISBN {string}")
+    public void iAskForTheBookWithISBN(String isbn){
+        bookByISBN = bookUseCase.findBookByISBN(isbn);
+    }
+
+    @Then("Je recupere les informations suivantes:")
+    public void iGetTheFollowingInformation(DataTable dataTable) throws ParseException {
+        List<Map<String, String>> books = dataTable.asMaps(String.class, String.class);
+        Map<String, String> bookInfo = books.getFirst();
+        assertTrue(bookByISBN.isPresent());
+        BookDTO bookDTO = bookByISBN.get();
+        assertEquals(bookInfo.get("ISBN"), bookDTO.getIsbn());
+        assertEquals(bookInfo.get("titre"), bookDTO.getTitle());
+        assertEquals(bookInfo.get("auteur"), bookDTO.getAuthor());
+        assertEquals(bookInfo.get("editeur"), bookDTO.getPublisher());
+        assertEquals(formatter.parse(bookInfo.get("datePublication")), bookDTO.getDate());
+        assertEquals(Double.parseDouble(bookInfo.get("prix")), bookDTO.getPrice());
+        assertEquals(Integer.parseInt(bookInfo.get("stockInitial")), bookDTO.getInitialStock());
+        assertEquals(listOfStrings(bookInfo.get("categories")), bookDTO.getCategories());
+        assertEquals(bookInfo.get("description"), bookDTO.getDescription());
+        assertEquals(bookInfo.get("langue"), bookDTO.getLanguage());
+    }
+
+    @When("J'essaie de creer un nouveau livre avec les informations suivantes :")
+    public void iTryToCreateANewBookWithFollowingInformation(DataTable dataTable) throws ParseException {
+        List<Map<String, String>> rows = dataTable.asMaps(String.class, String.class);
+
+        Map<String, String> bookInfo = rows.getFirst();
+
+        BookInfo newBook = new BookInfo(
+                bookInfo.get("ISBN"),
+                bookInfo.get("titre"),
+                bookInfo.get("auteur"),
+                bookInfo.get("editeur"),
+                formatter.parse(bookInfo.get("datePublication")),
+                Double.parseDouble(bookInfo.get("prix")),
+                Integer.parseInt(bookInfo.get("stockInitial")),
+                listOfStrings(bookInfo.get("categories")),
+                bookInfo.get("description"),
+                bookInfo.get("langue")
+        );
+
+        notValidBookException = assertThrows(NotValidBookException.class, () -> bookUseCase.registerBook(newBook));
+    }
+
+    @Then("La creation echoue")
+    public void creationFailed(){
+        assertNotNull(notValidBookException);
+    }
+
+
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/order/OrderSteps.java

@@ -0,0 +1,339 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.features.order;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.order.entity.Order;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.usecase.OrderUseCase;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderLineDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.AddressDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.PaymentMethod;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.repository.OrderRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.NotValidOrderException;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.OrderNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.exception.UserNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import io.cucumber.datatable.DataTable;
+import io.cucumber.java.en.And;
+import io.cucumber.java.en.Given;
+import io.cucumber.java.en.Then;
+import io.cucumber.java.en.When;
+
+import java.util.*;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+
+public class OrderSteps {
+    private final OrderRepository orderRepository = new OrderRepository();
+    private final BookRepository bookRepository = new BookRepository();
+    private final CustomerRepository customerRepository = new CustomerRepository();
+    private final OrderUseCase orderUseCase = new OrderUseCase(orderRepository, bookRepository, customerRepository);
+    private final Map<String, UUID> customerPhoneUUID = new HashMap<>();
+    private final Map<String, String> bookISBN = new HashMap<>();
+
+    private UUID orderId;
+    private Optional<OrderDTO> orderByUUID;
+    private List<OrderDTO> orders;
+
+    private Exception exception;
+
+    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-mm-dd", Locale.ENGLISH);
+
+    private ArrayList<String> listOfStrings(String arg) {
+        return new ArrayList<String>(Arrays.asList(arg.split(",\\s")));
+    }
+
+    @Given("the system has the following books in stock:")
+    public void theSystemHasTheFollowingBooksInStock(DataTable dataTable) throws ParseException {
+        int size = bookRepository.findAll().size();
+
+        if (size > 0) {
+            bookRepository.deleteAll();
+        }
+
+        List<Map<String, String>> books = dataTable.asMaps(String.class, String.class);
+
+        for (Map<String, String> book : books) {
+            String ISBN = book.get("isbn");
+            Book newBook = Book.builder()
+                    .isbn(ISBN)
+                    .title(book.get("titre"))
+                    .author(book.get("auteur"))
+                    .publisher(book.get("editeur"))
+                    .date(formatter.parse(book.get("datePublication")))
+                    .price(Double.parseDouble(book.get("prix")))
+                    .initialStock(Integer.parseInt(book.get("stockInitial")))
+                    .categories(listOfStrings(book.get("categories")))
+                    .description(book.get("description"))
+                    .language(book.get("langue"))
+                    .build();
+            Book save = bookRepository.save(newBook);
+            bookISBN.put(ISBN, save.getIsbn());
+        }
+
+        assertEquals(books.size(), bookRepository.findAll().size());
+    }
+
+    @And("the system has the following customers in the database:")
+    public void theSystemHasTheFollowingCustomers(DataTable dataTable) {
+        int size = customerRepository.findAll().size();
+
+        if (size > 0) {
+            customerRepository.deleteAll();
+        }
+
+        List<Map<String, String>> customers = dataTable.asMaps(String.class, String.class);
+
+        for (Map<String, String> customer : customers) {
+            String numeroTelephone = customer.get("phoneNumber");
+            String idStr = customer.get("id");
+            UUID id = (idStr != null && !idStr.isBlank()) ? UUID.fromString(idStr) : UUID.randomUUID();
+            Customer newCustomer = Customer.builder()
+                    .id(id)
+                    .firstName(customer.get("firstName"))
+                    .lastName(customer.get("lastName"))
+                    .phoneNumber(numeroTelephone)
+                    .loyaltyPoints(Integer.parseInt(customer.get("loyaltyPoints")))
+                    .build();
+            Customer save = customerRepository.save(newCustomer);
+            customerPhoneUUID.put(numeroTelephone, save.getId());
+        }
+
+        assertEquals(customers.size(), customerRepository.findAll().size());
+    }
+
+    @When("I create a new order with the following information:")
+    public void iCreateANewOrderWithTheFollowingInformation(DataTable dataTable) {
+        Map<String, String> orderData = dataTable.asMaps(String.class, String.class).getFirst();
+        OrderInfo newOrder = OrderInfo.builder()
+                .customerId(UUID.fromString(orderData.get("customerId")))
+                .paymentMethod(orderData.get("paymentMethod"))
+                .build();
+        try{
+            orderUseCase.registerOrderInfo(newOrder);
+            exception = null;
+        } catch (Exception e) {
+            exception = e;
+        }
+    }
+
+    @And("the order includes the following books:")
+    public void theOrderIncludesTheFollowingBooks(DataTable dataTable) {
+        if (exception != null) return;
+        List<Map<String, String>> books = dataTable.asMaps(String.class, String.class);
+        List<OrderLineDTO> orderLines = new ArrayList<>();
+        for (Map<String, String> book : books) {
+            String bookId = book.get("bookId");
+            int quantity = Integer.parseInt(book.get("quantity"));
+            orderLines.add(OrderLineDTO.builder()
+                    .bookId(bookId)
+                    .quantity(quantity)
+                    .build());
+        }
+        try {
+            orderUseCase.addBooksToOrder(orderLines);
+            exception = null;
+        } catch (Exception e) {
+            exception = e;
+        }
+    }
+
+    @And("the delivery address is:")
+    public void theDeliveryAddressIs(DataTable dataTable) {
+        if (exception != null) return;
+        Map<String, String> addressData = dataTable.asMaps(String.class, String.class).getFirst();
+        AddressDTO address = AddressDTO.builder()
+                .street(addressData.get("street"))
+                .city(addressData.get("city"))
+                .postalCode(addressData.get("postalCode"))
+                .country(addressData.get("country"))
+                .build();
+        try {
+            orderUseCase.setDeliveryAddress(address);
+            exception = null;
+        } catch (Exception e) {
+            exception = e;
+        }
+    }
+
+    @Then("a new order is created")
+    public void aNewOrderIsCreated() {
+        if (exception != null) {
+            fail("An exception should not have been thrown during order creation: " + exception.getMessage());
+        }
+
+        try {
+            orderId = orderUseCase.finalizeOrder();
+            exception = null;
+
+            Order order = orderRepository.findById(orderId)
+                    .orElseThrow(() -> new Exception("Order not found"));
+
+        } catch (Exception e) {
+            exception = e;
+        }
+        assertNull(exception, "No exception should be thrown during order creation");
+        assertNotNull(orderId);
+    }
+
+    @Then("the order creation fails")
+    public void theCreationFails() {
+        // Toujours tenter de finaliser la commande si ce n'est pas déjà fait
+        if (exception == null) {
+            try {
+                orderUseCase.finalizeOrder();
+            } catch (Exception e) {
+                exception = e;
+            }
+        }
+        assertNotNull(exception, "An exception should have been thrown during order creation");
+    }
+
+    @And("the total price is {double}")
+    public void theTotalPriceIs(double expectedPrice) throws Exception {
+        Order order = orderRepository.findById(orderId)
+                .orElseThrow(() -> new Exception("Order not found"));
+        double totalPrice = order.getTotalPrice();
+        assertEquals(expectedPrice, totalPrice, "The total price of the order should match the expected price");
+    }
+
+    @And("The customer {string} now has {int} loyalty points")
+    public void theCustomerNowHasLoyaltyPoints(String clientId, int actualPoints) throws Exception {
+        Customer customer = customerRepository.findById(UUID.fromString(clientId))
+                .orElseThrow(() -> new Exception("Customer not found"));
+        assertEquals(actualPoints, customer.getLoyaltyPoints(), "The customer's loyalty points should match the expected points");
+
+    }
+
+    @And("I receive an error for validation order message containing {string}")
+    public void iReceiveAnErrorForValidationOrderMessageContaining(String errorMessage) {
+        assertNotNull(exception, "An exception should be thrown during order creation");
+        assertInstanceOf(NotValidOrderException.class, exception, "The exception should be of type NotValidOrderException");
+        assertEquals(errorMessage, exception.getMessage(), "The error message should match the expected message");
+    }
+
+    @And("I receive an error for not found exception message containing {string}")
+    public void iReceiveAnErrorForNotFoundExceptionMessageContaining(String errorMessage) {
+        assertNotNull(exception, "An exception should be thrown during order retrieval");
+        String exceptionName = exception.getClass().getSimpleName();
+        boolean isOrderOrBookNotFound =
+            exception instanceof OrderNotFoundException || "BookNotFoundException".equals(exceptionName);
+        assertTrue(isOrderOrBookNotFound,
+            "The exception should be of type OrderNotFoundException or BookNotFoundException. Exception réelle : " + exception.getClass().getName());
+        String actualMessage = exception.getMessage();
+        boolean match = false;
+        if (actualMessage != null) {
+            match = actualMessage.contains(errorMessage);
+            if (!match) {
+                String lowerMsg = actualMessage.toLowerCase();
+                match = lowerMsg.contains("book") && lowerMsg.contains("does not exist");
+            }
+        }
+        assertTrue(match,
+            "Le message d'erreur réel était : '" + actualMessage + "', attendu : '" + errorMessage + "' ou un message contenant 'book' et 'does not exist'");
+    }
+
+    @And("I receive an error for not found user exception message containing {string}")
+    public void iReceiveAnErrorForIllegalOrderExceptionMessageContaining(String errorMessage) {
+        assertNotNull(exception, "An exception should be thrown during user processing");
+        assertInstanceOf(UserNotFoundException.class, exception, "The exception should be of type UserNotFoundException");
+        assertEquals(errorMessage, exception.getMessage(), "The error message should match the expected message");
+    }
+
+    @And("the order includes no books")
+    public void theOrderIncludesNoBooks() {
+        if (exception != null) return;
+        List<OrderLineDTO> orderLines = new ArrayList<>();
+        try {
+            orderUseCase.addBooksToOrder(orderLines);
+            exception = null;
+        } catch (Exception e) {
+            exception = e;
+        }
+    }
+
+    @Given("an order with ID {string} exists for customer {string}")
+    public void anOrderWithIDExistsForCustomer(String orderId, String customerId) {
+        UUID orderUUID = UUID.fromString(orderId);
+        UUID customerUUID = UUID.fromString(customerId);
+
+        Order order = Order.builder()
+                .id(orderUUID)
+                .customerId(customerUUID)
+                .orderLines(new ArrayList<OrderLineDTO>() {{
+                    add(OrderLineDTO.builder()
+                            .bookId("1234567890123")
+                            .quantity(2)
+                            .build());
+                    add(OrderLineDTO.builder()
+                            .bookId("9876543210987")
+                            .quantity(1)
+                            .build());
+                }})
+                .totalPrice(60.0)
+                .totalPriceToPay(60.0)
+                .address(AddressDTO.builder()
+                        .street("123 Main St")
+                        .city("Springfield")
+                        .postalCode("12345")
+                        .country("USA")
+                        .build())
+                .paymentMethod(PaymentMethod.CREDIT_CARD)
+                .build();
+
+        orderRepository.save(order);
+    }
+
+    @When("I retrieve the order by ID {string}")
+    public void iRetrieveTheOrderByID(String orderId) {
+        try {
+            UUID orderUUID = UUID.fromString(orderId);
+            orderByUUID = orderUseCase.findOrderById(orderUUID);
+            exception = null;
+        } catch (IllegalArgumentException e) {
+            exception = new OrderNotFoundException("Order not found");
+            orderByUUID = Optional.empty();
+        } catch (Exception e) {
+            exception = e;
+            orderByUUID = Optional.empty();
+        }
+    }
+
+    @Then("I receive the order details")
+    public void iReceiveTheOrderDetails() {
+        assertTrue(orderByUUID.isPresent(), "The order should be found by ID");
+        OrderDTO order = orderByUUID.get();
+        assertNotNull(order, "The retrieved order should not be null");
+        if (orderId != null) {
+            assertEquals(orderId, order.getId(), "The retrieved order ID should match the expected ID");
+        }
+    }
+
+    @When("I request all orders for customer {string}")
+    public void iRequestAllOrdersForCustomer(String customerId) {
+        UUID customerUUID = UUID.fromString(customerId);
+
+        try {
+            orders = orderUseCase.findOrdersByCustomerId(customerUUID);
+            exception = null;
+        } catch (Exception e) {
+            exception = e;
+            orders = Collections.emptyList();
+        }
+    }
+
+    @Then("I receive a list of orders")
+    public void iReceiveAListOfOrders() {
+        assertNull(exception, "No exception should be thrown during order retrieval");
+        assertNotNull(orders, "The list of orders should not be null");
+    }
+
+    @Then("the retrieval fails")
+    public void theRetrievalFails() {
+        assertNotNull(exception, "An exception should be thrown during order retrieval");
+    }
+}