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

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+package fr.iut_fbleau.but3.dev62.mylibrary.book;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Category;
+import java.time.LocalDate;
+import java.util.List;
+import lombok.Builder;
+import lombok.Getter;
+
+@Builder
+@Getter
+public class BookDTO {
+  private final long isbn;
+  private final String title;
+  private final String author;
+  private final String publisher;
+  private final LocalDate publicationDate;
+  private final double price;
+  private final int quantity;
+  private final List<Category> categories;
+  private final String description;
+  private final String language;
+}

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

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+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;
+
+public final class BookConverter {
+
+  private BookConverter() {
+
+  }
+
+  public static Book toDomain(BookInfo book) {
+    return Book.builder()
+        .isbn(book.isbn())
+        .title(book.title())
+        .author(book.author())
+        .publisher(book.publisher())
+        .publicationDate(book.publicationDate())
+        .price(book.price())
+        .quantity(book.quantity())
+        .categories(book.categories())
+        .description(book.description())
+        .language(book.language())
+        .build();
+  }
+
+  public static BookDTO toDTO(Book book) {
+    return BookDTO.builder()
+        .isbn(book.getIsbn())
+        .title(book.getTitle())
+        .author(book.getAuthor())
+        .publisher(book.getPublisher())
+        .publicationDate(book.getPublicationDate())
+        .price(book.getPrice())
+        .quantity(book.getQuantity())
+        .categories(book.getCategories())
+        .description(book.getDescription())
+        .language(book.getLanguage())
+        .build();
+  }
+}

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

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+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.book.entity.Category;
+import java.time.LocalDate;
+import java.util.List;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class BookConverterTest {
+
+  @Nested
+  @DisplayName("toDomain() method tests")
+  class ToDomainTests {
+
+    @Test
+    @DisplayName("Should convert BookInfo to Book entity preserving all fields")
+    void testToDomain() {
+      BookInfo info = new BookInfo(
+          9780321125217L,
+          "DDD",
+          "Evans",
+          "Addison-Wesley",
+          LocalDate.of(2003, 8, 22),
+          54.99,
+          10,
+          List.of(Category.SCIENCE),
+          "desc",
+          "EN"
+      );
+
+      Book book = BookConverter.toDomain(info);
+
+      assertEquals(info.isbn(), book.getIsbn());
+      assertEquals(info.title(), book.getTitle());
+      assertEquals(info.author(), book.getAuthor());
+      assertEquals(info.publisher(), book.getPublisher());
+      assertEquals(info.publicationDate(), book.getPublicationDate());
+      assertEquals(info.price(), book.getPrice());
+      assertEquals(info.quantity(), book.getQuantity());
+      assertEquals(info.categories(), book.getCategories());
+      assertEquals(info.description(), book.getDescription());
+      assertEquals(info.language(), book.getLanguage());
+    }
+  }
+
+  @Nested
+  @DisplayName("toDTO() method tests")
+  class ToDTOTests {
+
+    @Test
+    @DisplayName("Should convert Book entity to BookDTO preserving all fields")
+    void testToDTO() {
+      Book book = Book.builder()
+          .isbn(123L)
+          .title("T")
+          .author("A")
+          .publisher("P")
+          .publicationDate(LocalDate.of(2020, 1, 1))
+          .price(9.99)
+          .quantity(5)
+          .categories(List.of(Category.FICTION))
+          .description("d")
+          .language("FR")
+          .build();
+
+      BookDTO dto = BookConverter.toDTO(book);
+
+      assertEquals(123L, dto.getIsbn());
+      assertEquals("T", dto.getTitle());
+      assertEquals("A", dto.getAuthor());
+      assertEquals("P", dto.getPublisher());
+      assertEquals(LocalDate.of(2020, 1, 1), dto.getPublicationDate());
+      assertEquals(9.99, dto.getPrice());
+      assertEquals(5, dto.getQuantity());
+      assertEquals(List.of(Category.FICTION), dto.getCategories());
+      assertEquals("d", dto.getDescription());
+      assertEquals("FR", dto.getLanguage());
+    }
+  }
+}