// EntityManager em = emf.createEntityManager();
int test = 0 ;
switch (test) {
case 0:
User userToInsert = new User ();
userToInsert.setUsername("PROVAJPA");
userToInsert.setEmail("provaJPA_123");
userToInsert.setPassword("password123");
boolean userInserted = DBManager.executeInsert(userToInsert);
System.out.println("Test.main - DEBUG - userInserted: " + userInserted);
break;
case 1:
// executeSingleSelect(em);