@Test
  public void createPurchaseTest() {

    PurchaseEntity newEntity = createTestObject();
    PurchaseEntity result = purchasePersistence.create(newEntity);

    Assert.assertNotNull(result);
    PurchaseEntity entity = em.find(PurchaseEntity.class, result.getId());

    Assert.assertEquals(newEntity.getCardNumber(), entity.getCardNumber());
  }