tested the app

src/main/java/mate/academy/Main.java

@@ -1,7 +1,33 @@
 package mate.academy;
 
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
 public class Main {
+    private static final Injector injector = Injector.getInstance("mate.academy");
+    private static final BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+
     public static void main(String[] args) {
+        Book book = new Book("book", BigDecimal.valueOf(100));
+        Book createdBook = bookDao.create(book);
+        System.out.println(createdBook);
+
+        Optional<Book> getBookById = bookDao.findById(1L);
+        System.out.println("Book by id " + getBookById);
+
+        book.setTitle("Updated Book");
+        book.setPrice(BigDecimal.valueOf(200));
+        Book updatedBook = bookDao.update(book);
+        System.out.println("Updated Book: " + updatedBook);
+
+        List<Book> getAllBook = bookDao.findAll();
+        System.out.println("All Books : " + getAllBook);
 
+        boolean deleteBook = bookDao.deleteById(3L);
+        System.out.println("Deleted book: " + deleteBook);
     }
 }