When we create Entity and Respority, we also need to do validations to protect our data.

In Java, validations are built-in, using decorators. For Typescript, found a useful libaray to do the similar validation as well. Checkout class-validator

Entity:

@Entity
public class Book { // ======================================
// = Attributes =
// ====================================== @Id
@GeneratedValue
private Long id; @Column(length = 200)
@NotNull
@Size(min
= 1, max = 200)
private String title; @Column(length = 10000)
@Size(min = 1, max = 10000)
private String description; @Column(name = "unit_cost")
@Min(1)
private Float unitCost; @Column(length = 50)
@NotNull
@Size(min
= 1, max = 50)
private String isbn; @Column(name = "publication_date")
@Temporal(TemporalType.DATE)
@Past
private Date publicationDate; ....
}

Testing:

We want to test, if we give title as null, it should throw exception.

@RunWith(Arquillian.class)
public class BookRepositoryTest { @Inject
private BookRepository bookRepository; // We want the test throw exception
@Test(expected = Exception.class)
public void createInvalidBook() {
Book book = new Book("isbn", null, 12F, 123, Language.ENGLISH, new Date(), "imageURL", "description");
bookRepository.create(book);
} @Deployment
public static JavaArchive createDeployment() {
return ShrinkWrap.create(JavaArchive.class)
.addClass(BookRepository.class)
.addClass(Book.class)
.addClass(Language.class)
.addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml")
.addAsManifestResource("META-INF/test-persistence.xml", "persistence.xml");
} @org.junit.Test
public void create() {
}
}

Respority:

@Transactional(SUPPORTS)
public class BookRepository { // ======================================
// = Injection Points =
// ====================================== @PersistenceContext(unitName = "bookStorePU")
private EntityManager em; // ======================================
// = Business methods =
// ====================================== public Book find(@NotNull Long id) {
return em.find(Book.class, id);
} // For creating and deleting methods, we want to use REQUIRED
@Transactional(REQUIRED)
public Book create(@NotNull Book book) {
em.persist(book);
return book;
} }

Testing:

    @Test(expected = Exception.class)
public void findWithInvalidId() {
bookRepository.find(null);
}

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