Chapter 2 - BookTest.java

package com.apress.javaee6.chapter02;

import java.util.List;
import java.sql.SQLException;
import javax.persistence.*;
import org.junit.BeforeClass;
import org.junit.Before;
import org.junit.Test;
import org.junit.AfterClass;
import static org.junit.Assert.assertNotNull;

public class BookTest {
   private static EntityManagerFactory emf;
   private static EntityManager em;
   private static EntityTransaction tx;
   @BeforeClass
   public static void initEntityManager() throws Exception {
      emf = Persistence.createEntityManagerFactory("chapter02PU");
      em = emf.createEntityManager();
   }
   @AfterClass
   public static void closeEntityManager() throws SQLException {
      em.close();
      emf.close();
   }
   @Before
   public void initTransaction() {
      tx = em.getTransaction();
   }
   @Test
   public void createBook() throws Exception {
      // Creates an instance of book
      Book book = new Book();
      book.setTitle("The Hitchhiker's Guide to the Galaxy");
      book.setPrice(12.5F);
      book.setDescription("Science fiction comedy book");
      book.setIsbn("1-84023-742-2");
      book.setNbOfPage(354);
      book.setIllustrations(false);
      // Persists the book to the database
      tx.begin();
      em.persist(book);
      tx.commit();
      assertNotNull("ID should not be null", book.getId());
      // Retrieves all the books from the database
      List<Book> books = em.createNamedQuery("findAllBooks").getResultList();
      assertNotNull(books);
   }
}