Solution si jamais on ne peut pas modifier InnerManager

gistfile1.java

import static org.hamcrest.Matchers.contains;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;

import java.util.Arrays;
import java.util.List;

import org.junit.Test;
import org.mockito.Mockito;

public class AccountManager implements IAccountManager {
    IAccountInnerManager innerManager;
    public AccountManager(IAccountInnerManager innerManager) {
        this.innerManager = innerManager;
    }

    /**
     * @deprecated Use {@link InnerManager#purgeAccounts()} instead
     */
    public void purgeAccounts() {
        innerManager.purgeAccounts();
    }

    public static class AccountManagerPurgeAccountsTest {  

        @Test  //ce test a perdu beacoup de son sens vu qu'il n'y a plus de logique dans AccountManager
        public void testPurgeAccountsWithSeveralPurgeableAccountsInDb() {
            IAccountInnerManager innerManager = Mockito.mock(IAccountInnerManager.class);
            IAccountManager manager = new AccountManager(innerManager); // injection des dépendances

            manager.purgeAccounts();

            verify(innerManager).purgeAccounts(); 
        }
        @Test
        public void purgeAccountsWithSeveralPurgeableAccountsInDb() {
            DAO dao = new DAO();
            dao.insertRemovable("id1");
            dao.insertRemovable("id2");
            dao.insertRemNotovable("id3");
            InnerManager innerManager = new InnerManager(dao);

            innerManager.purgeAccounts();

            List<String> accountIds = dao.getAllAccountsIds();
            assertThat(accountIds, contains("id3"));
        }
    }
}




import static java.util.Arrays.asList;

import java.util.List;


class InnerManager implements IAccountInnerManager {

    public InnerManager(DAO dao) {
        // TODO Auto-generated constructor stub
    }

    @Transactional
    public void purgeExtServiceAccount(String id) {
        // TODO Auto-generated method stub

    }

    @Transactional
    public List<String> purgeCustomerAccountsInDb() {
        // TODO Auto-generated method stub
        return asList();
    }

    public void purgeAccounts() {
        List<String> deletedAccountsId = purgeCustomerAccountsInDb();
        for (String id : deletedAccountsId) {
            purgeExtServiceAccount(id);
        }
    }
}