ajout du scenario cucumber et du README

mylibrary/README.md

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+# mylibrary — back-end Java (méthode BDD)
+
+Back-end du projet **2026-DEV-BUT3**. Reproduit, en Java pur, le cœur métier
+de l'API consommée par le front React `my-library/`.
+
+## Méthode
+
+Conformément au cours `maintenanceApplicativeCours1.pdf` (Behavior-Driven
+Development), pour chaque comportement on :
+
+1. Écrit le scénario attendu (en Gherkin / `.feature` ou en `@DisplayName` JUnit)
+2. Écrit le test qui le vérifie
+3. Implémente le code qui fait passer le test
+
+## Structure (calquée sur le module `customer` fourni par le prof)
+
+```
+src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/
+├─ customer/        Module fourni par l'enseignant (intact)
+│  ├─ CustomerInfo.java   record d'entrée
+│  ├─ CustomerDTO.java    DTO de sortie
+│  ├─ entity/             Customer (objet métier, règles fidélité)
+│  ├─ exception/          Exceptions métier
+│  ├─ converter/          Mapping Info <-> entity <-> DTO
+│  ├─ validator/          Règles de validation
+│  ├─ repository/         Stockage en mémoire (List)
+│  └─ usecase/            Cas d'usage (orchestration)
+└─ book/             Module développé en miroir (notre travail)
+   └─ … (mêmes sous-paquets, même découpage)
+
+src/test/java/.../mylibrary/
+├─ customer/         Tests JUnit fournis par l'enseignant
+├─ book/             Tests JUnit que nous avons écrits
+└─ features/
+   ├─ RunCucumberTest.java         (du prof, intact)
+   ├─ client/CustomerSteps.java    (du prof, intact)
+   ├─ book/BookSteps.java          (notre travail)
+   └─ resources/features/
+      ├─ client.feature            (du prof, intact)
+      └─ book.feature              (notre travail)
+```
+
+## Dépendances
+
+Strictement les mêmes que dans le template du prof :
+
+- JUnit 5 (jupiter-api, params, engine + platform-suite, platform-engine, platform-launcher)
+- Mockito (core, junit-jupiter)
+- Cucumber (cucumber-java, cucumber-junit-platform-engine)
+- Lombok
+
+## Build & test
+
+Pré-requis : **JDK 21** + **Maven 3.9+**
+
+```bash
+mvn -f mylibrary test
+```
+
+Cette commande exécute :
+
+- les tests unitaires JUnit (entity, validator, converter, repository, usecase, exceptions)
+- les scénarios Cucumber (`client.feature` + `book.feature`) via `RunCucumberTest`
+
+## Périmètre couvert
+
+Conformément à la consigne (« reproduire le strict nécessaire pour démontrer
+la maîtrise »), l'API se limite aux deux domaines présents dans le swagger
+qui structurent l'app React :
+
+- **Catalogue** (`book`) : enregistrer, consulter par ISBN, lister tous les livres,
+  refuser ISBN dupliqué, refuser un livre invalide, gérer le stock.
+- **Comptes clients** (`customer`) : enregistrer, consulter par téléphone, mettre
+  à jour, supprimer, ajouter / retirer des points de fidélité (module fourni).
+
+L'exposition HTTP réelle utilisée par les développeurs front est l'API du prof
+(`mylibrary-0.0.1-SNAPSHOT.jar`) ; ce module sert à démontrer la maîtrise
+de la **conception métier en BDD/TDD**.

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

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+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.BookAlreadyExistsException;
+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 fr.iut_fbleau.but3.dev62.mylibrary.book.validator.BookValidator;
+import java.util.List;
+import java.util.Optional;
+
+public final class BookUseCase {
+
+  private final BookRepository bookRepository;
+
+  public BookUseCase(BookRepository bookRepository) {
+    this.bookRepository = bookRepository;
+  }
+
+  public long registerBook(BookInfo bookInfo) throws NotValidBookException, BookAlreadyExistsException {
+    BookValidator.validate(bookInfo);
+    if (bookRepository.existsByIsbn(bookInfo.isbn())) {
+      throw new BookAlreadyExistsException(bookInfo.isbn());
+    }
+    Book toRegister = BookConverter.toDomain(bookInfo);
+    Book registered = bookRepository.save(toRegister);
+    return registered.getIsbn();
+  }
+
+  public BookDTO getBookByIsbn(long isbn) throws BookNotFoundException {
+    Optional<Book> optional = bookRepository.findByIsbn(isbn);
+    if (optional.isEmpty()) {
+      throw new BookNotFoundException(isbn);
+    }
+    return BookConverter.toDTO(optional.get());
+  }
+
+  public List<BookDTO> getAllBooks() {
+    return bookRepository.findAll().stream()
+        .map(BookConverter::toDTO)
+        .toList();
+  }
+}

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

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+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.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Category;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookAlreadyExistsException;
+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 java.time.LocalDate;
+import java.util.List;
+import java.util.Optional;
+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 org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class BookUseCaseTest {
+
+  @Mock
+  private BookRepository bookRepository;
+
+  @InjectMocks
+  private BookUseCase bookUseCase;
+
+  private BookInfo validInfo;
+  private Book validBook;
+
+  @BeforeEach
+  void setUp() {
+    validInfo = new BookInfo(
+        9780321125217L,
+        "DDD",
+        "Evans",
+        "Addison-Wesley",
+        LocalDate.of(2003, 8, 22),
+        54.99,
+        10,
+        List.of(Category.SCIENCE),
+        "desc",
+        "EN"
+    );
+    validBook = Book.builder()
+        .isbn(validInfo.isbn())
+        .title(validInfo.title())
+        .author(validInfo.author())
+        .publisher(validInfo.publisher())
+        .publicationDate(validInfo.publicationDate())
+        .price(validInfo.price())
+        .quantity(validInfo.quantity())
+        .categories(validInfo.categories())
+        .description(validInfo.description())
+        .language(validInfo.language())
+        .build();
+  }
+
+  @Nested
+  @DisplayName("registerBook tests")
+  class RegisterTests {
+
+    @Test
+    @DisplayName("Should register a new book and return its ISBN")
+    void testRegisterBook() throws NotValidBookException, BookAlreadyExistsException {
+      when(bookRepository.existsByIsbn(validInfo.isbn())).thenReturn(false);
+      when(bookRepository.save(any(Book.class))).thenReturn(validBook);
+
+      long isbn = bookUseCase.registerBook(validInfo);
+
+      assertEquals(validInfo.isbn(), isbn);
+      verify(bookRepository).existsByIsbn(validInfo.isbn());
+      verify(bookRepository).save(any(Book.class));
+    }
+
+    @Test
+    @DisplayName("Should reject invalid book information without touching the repository")
+    void testRegisterInvalidBook() {
+      BookInfo invalid = new BookInfo(0L, "", "", "", null, -1, -1, null, "", "");
+      assertThrows(NotValidBookException.class, () -> bookUseCase.registerBook(invalid));
+      verifyNoInteractions(bookRepository);
+    }
+
+    @Test
+    @DisplayName("Should reject duplicate ISBN")
+    void testRegisterDuplicate() {
+      when(bookRepository.existsByIsbn(validInfo.isbn())).thenReturn(true);
+      assertThrows(BookAlreadyExistsException.class, () -> bookUseCase.registerBook(validInfo));
+      verify(bookRepository).existsByIsbn(validInfo.isbn());
+      verify(bookRepository, never()).save(any(Book.class));
+    }
+  }
+
+  @Nested
+  @DisplayName("getBookByIsbn tests")
+  class GetByIdTests {
+
+    @Test
+    @DisplayName("Should return the BookDTO when ISBN exists")
+    void testGetById() throws BookNotFoundException {
+      when(bookRepository.findByIsbn(validInfo.isbn())).thenReturn(Optional.of(validBook));
+
+      BookDTO dto = bookUseCase.getBookByIsbn(validInfo.isbn());
+
+      assertEquals(validInfo.isbn(), dto.getIsbn());
+      assertEquals(validInfo.title(), dto.getTitle());
+    }
+
+    @Test
+    @DisplayName("Should throw when ISBN does not exist")
+    void testGetByIdNotFound() {
+      when(bookRepository.findByIsbn(99L)).thenReturn(Optional.empty());
+      assertThrows(BookNotFoundException.class, () -> bookUseCase.getBookByIsbn(99L));
+    }
+  }
+
+  @Nested
+  @DisplayName("getAllBooks tests")
+  class GetAllBooksTests {
+
+    @Test
+    @DisplayName("Should map every book returned by the repository to a DTO")
+    void testGetAllBooks() {
+      when(bookRepository.findAll()).thenReturn(List.of(validBook));
+
+      List<BookDTO> result = bookUseCase.getAllBooks();
+
+      assertEquals(1, result.size());
+      assertEquals(validBook.getIsbn(), result.getFirst().getIsbn());
+      assertEquals(validBook.getTitle(), result.getFirst().getTitle());
+      verify(bookRepository).findAll();
+    }
+
+    @Test
+    @DisplayName("Should return an empty list when no book is stored")
+    void testGetAllBooksWhenEmpty() {
+      when(bookRepository.findAll()).thenReturn(List.of());
+
+      List<BookDTO> result = bookUseCase.getAllBooks();
+
+      assertTrue(result.isEmpty());
+    }
+  }
+}

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

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+package fr.iut_fbleau.but3.dev62.mylibrary.features.book;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+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.Category;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookAlreadyExistsException;
+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 fr.iut_fbleau.but3.dev62.mylibrary.book.usecase.BookUseCase;
+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.time.LocalDate;
+import java.util.List;
+import java.util.Map;
+
+public class BookSteps {
+
+  private final BookRepository bookRepository = new BookRepository();
+  private final BookUseCase bookUseCase = new BookUseCase(bookRepository);
+
+  private long lastRegisteredIsbn;
+  private BookDTO retrievedBook;
+  private List<BookDTO> allBooks;
+  private Exception lastException;
+
+  @Given("the catalog has the following books:")
+  public void theCatalogHasTheFollowingBooks(DataTable dataTable) throws NotValidBookException, BookAlreadyExistsException {
+    bookRepository.deleteAll();
+    for (Map<String, String> row : dataTable.asMaps(String.class, String.class)) {
+      bookUseCase.registerBook(toBookInfo(row));
+    }
+  }
+
+  @When("I register a new book with the following information:")
+  public void iRegisterANewBook(DataTable dataTable) throws NotValidBookException, BookAlreadyExistsException {
+    Map<String, String> row = dataTable.asMaps(String.class, String.class).getFirst();
+    lastRegisteredIsbn = bookUseCase.registerBook(toBookInfo(row));
+  }
+
+  @When("I try to register a new book with the following information:")
+  public void iTryToRegisterANewBook(DataTable dataTable) {
+    Map<String, String> row = dataTable.asMaps(String.class, String.class).getFirst();
+    lastException = assertThrows(Exception.class, () -> bookUseCase.registerBook(toBookInfo(row)));
+  }
+
+  @When("I request the book with isbn {long}")
+  public void iRequestTheBook(long isbn) throws BookNotFoundException {
+    retrievedBook = bookUseCase.getBookByIsbn(isbn);
+  }
+
+  @When("I list all books")
+  public void iListAllBooks() {
+    allBooks = bookUseCase.getAllBooks();
+  }
+
+  @Then("the book is created")
+  public void theBookIsCreated() {
+    assertNotNull(lastRegisteredIsbn);
+  }
+
+  @And("the catalog now has {int} book(s)")
+  public void theCatalogNowHasNBooks(int expected) {
+    assertEquals(expected, bookRepository.findAll().size());
+  }
+
+  @Then("the registration fails with a {string}")
+  public void theRegistrationFailsWith(String exceptionSimpleName) {
+    assertNotNull(lastException);
+    assertEquals(exceptionSimpleName, lastException.getClass().getSimpleName());
+  }
+
+  @Then("I receive a book whose title is {string}")
+  public void iReceiveABookWhoseTitleIs(String title) {
+    assertNotNull(retrievedBook);
+    assertEquals(title, retrievedBook.getTitle());
+  }
+
+  @Then("I receive {int} book(s)")
+  public void iReceiveNBooks(int expected) {
+    assertNotNull(allBooks);
+    assertEquals(expected, allBooks.size());
+  }
+
+  private static BookInfo toBookInfo(Map<String, String> row) {
+    return new BookInfo(
+        Long.parseLong(row.get("isbn")),
+        row.get("titre"),
+        row.get("auteur"),
+        row.get("editeur"),
+        LocalDate.parse(row.get("datePublication")),
+        Double.parseDouble(row.get("prix")),
+        Integer.parseInt(row.get("stock")),
+        List.of(Category.valueOf(row.get("categorie"))),
+        "",
+        row.get("langue")
+    );
+  }
+}

mylibrary/src/test/resources/features/book.feature

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+# language: en
+
+Feature: Manage book catalog
+
+  Scenario: Register a new book in the catalog
+    When I register a new book with the following information:
+      | isbn          | titre    | auteur  | editeur | datePublication | prix  | stock | categorie | langue |
+      | 9780321125217 | DDD      | Evans   | AW      | 2003-08-22      | 54.99 | 10    | SCIENCE   | EN     |
+    Then the book is created
+    And the catalog now has 1 book
+
+  Scenario: Reject duplicate ISBN
+    Given the catalog has the following books:
+      | isbn          | titre    | auteur  | editeur | datePublication | prix  | stock | categorie | langue |
+      | 9780321125217 | DDD      | Evans   | AW      | 2003-08-22      | 54.99 | 10    | SCIENCE   | EN     |
+    When I try to register a new book with the following information:
+      | isbn          | titre    | auteur  | editeur | datePublication | prix  | stock | categorie | langue |
+      | 9780321125217 | DDD copy | Evans   | AW      | 2003-08-22      | 54.99 | 10    | SCIENCE   | EN     |
+    Then the registration fails with a "BookAlreadyExistsException"
+
+  Scenario: Reject invalid book information
+    When I try to register a new book with the following information:
+      | isbn          | titre | auteur | editeur | datePublication | prix | stock | categorie | langue |
+      | 9780321125217 |       | Evans  | AW      | 2003-08-22      | 0    | -1    | SCIENCE   | EN     |
+    Then the registration fails with a "NotValidBookException"
+
+  Scenario: Retrieve a book by its ISBN
+    Given the catalog has the following books:
+      | isbn          | titre    | auteur  | editeur | datePublication | prix  | stock | categorie | langue |
+      | 9780321125217 | DDD      | Evans   | AW      | 2003-08-22      | 54.99 | 10    | SCIENCE   | EN     |
+    When I request the book with isbn 9780321125217
+    Then I receive a book whose title is "DDD"
+
+  Scenario: List all books in the catalog
+    Given the catalog has the following books:
+      | isbn          | titre    | auteur  | editeur | datePublication | prix  | stock | categorie | langue |
+      | 9780321125217 | DDD      | Evans   | AW      | 2003-08-22      | 54.99 | 10    | SCIENCE   | EN     |
+      | 9780132350884 | Clean    | Martin  | PH      | 2008-08-01      | 30.00 | 5     | SCIENCE   | EN     |
+    When I list all books
+    Then I receive 2 books