import static org.junit.Assert.assertEquals;
 
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
 
import org.hibernate.validator.constraints.CreditCardNumber;
import org.junit.BeforeClass;
import org.junit.Test;
 
public class CreditCardNumberValidatorTest {
    private static Validator validator;
 
    @BeforeClass
    public static void setUp() {
        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        validator = factory.getValidator();
    }
 
    // Ok
    @Test
    public void validCardTest() {
        User user = new User();
        user.setCardNumber("4111111111111111");
        assertEquals(0, validator.validate(user).size());
    }
 
    public void invalidNumberTest() {
        User user = new User();
        user.setCardNumber("400");
        assertEquals(1, validator.validate(user).size());
    }
 
    @Test
    public void invalidTextTest() {
        User user = new User();
        user.setCardNumber("text not numbers");
        assertEquals(1, validator.validate(user).size());
    }
}
 
class User {
    @CreditCardNumber
    public String cardNumber;
 
    public String getCardNumber() {
        return cardNumber;
    }
 
    public void setCardNumber(String cardNumber) {
        this.cardNumber = cardNumber;
    }
}