diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/book.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/Book.java
similarity index 93%
rename from src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/book.java
rename to src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/Book.java
index d76d70c..a460ba9 100644
--- a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/book.java
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/Book.java
@@ -1,6 +1,6 @@
 package fr.iut_fbleau.but3.dev62.mylibrary.book;
 
-public class book {
+public class Book {
     private String isbn;
     private String title;
     private String author;
@@ -10,7 +10,7 @@ public class book {
     private String quantity;
     private String language;
 
-    public book(String isbn, String title, String author, String publisher,
+    public Book(String isbn, String title, String author, String publisher,
                 String publicationDate, String price, String quantity, String language) {
         this.isbn = isbn;
         this.title = title;
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/bookManagement.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookManagement.java
similarity index 77%
rename from src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/bookManagement.java
rename to src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookManagement.java
index fbfcd54..b48b64d 100644
--- a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/bookManagement.java
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookManagement.java
@@ -1,10 +1,10 @@
 package fr.iut_fbleau.but3.dev62.mylibrary.book;
 import java.util.*;
 
-public class bookManagement {
-    private final Map<String, book> books = new LinkedHashMap<>();
+public class BookManagement {
+    private final Map<String, Book> books = new LinkedHashMap<>();
 
-    public boolean registerBook(book book) {
+    public boolean registerBook(Book book) {
         if (!isValid(book)) {
             throw new IllegalArgumentException("Invalid book data provided");
         }
@@ -15,20 +15,20 @@ public class bookManagement {
         return true;
     }
 
-    public List<book> getAllBooks() {
+    public List<Book> getAllBooks() {
         return new ArrayList<>(books.values());
     }
 
-    public book getBookByIsbn(String isbn) {
+    public Book getBookByIsbn(String isbn) {
         if (!books.containsKey(isbn)) {
             throw new NoSuchElementException("Book not found");
         }
         return books.get(isbn);
     }
 
-    public List<book> getBooksByTitle(String title) {
+    public List<Book> getBooksByTitle(String title) {
         return books.values().stream()
-                .filter(book -> book.getTitle().equalsIgnoreCase(title))
+                .filter(Book -> Book.getTitle().equalsIgnoreCase(title))
                 .toList();
     }
 
@@ -36,7 +36,7 @@ public class bookManagement {
         return books.size();
     }
 
-    private boolean isValid(book book) {
+    private boolean isValid(Book book) {
         return book != null &&
                 notEmpty(book.getIsbn()) &&
                 notEmpty(book.getTitle()) &&
diff --git a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/bookError/error.java b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/error/bookErrorTest.java
similarity index 93%
rename from src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/bookError/error.java
rename to src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/error/bookErrorTest.java
index 082ddb7..5cfe43a 100644
--- a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/bookError/error.java
+++ b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/error/bookErrorTest.java
@@ -1,11 +1,11 @@
-package fr.iut_fbleau.but3.dev62.mylibrary.book.bookError;
+package fr.iut_fbleau.but3.dev62.mylibrary.book.error;
 
 import org.junit.jupiter.api.*;
 import static org.junit.jupiter.api.Assertions.*;
 import java.util.*;
 
 @DisplayName("Book error and failure scenarios")
-public class error {
+public class bookErrorTest {
 
     private String lastErrorMessage;
     private boolean lastOperationSuccess;
diff --git a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/book/BookSteps.java b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/book/BookSteps.java
index ac0040b..9767c60 100644
--- a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/book/BookSteps.java
+++ b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/features/book/BookSteps.java
@@ -1,4 +1,8 @@
 package fr.iut_fbleau.but3.dev62.mylibrary.features.book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.error.bookErrorTest;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.function.bookFunctionTest;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.result.bookResultTest;
+
 
 import static org.junit.jupiter.api.Assertions.*;