Mockito testing error. Wanted but not invoked exception

Sorry for typical question but i'm new in Mockito and can't understand what a problem. And could you say me, how to do Mockito units correctly, because I really can't understand them! Thanx a lot! I have got next exception:

Wanted but not invoked: transactionManager.execute( ua.khpi.shapoval.autostation.dao.UsersServiceTest$$Lambda$1/717386707@335eadca ); -> at ua.khpi.shapoval.autostation.dao.UsersServiceTest.testGetUserByLogin(UsersServiceTest.java:42) Actually, there were zero interactions with this mock.

Here is my DAO class:

  public class MySqlUsersDao implements UsersDao {
        /** Logger. */
        private static final Logger LOG = Logger.getLogger(MySqlUsersDao.class);

        /*
         * (non-Javadoc)
         * 
         * @see
         * ua.khpi.shapoval.autostation.dao.UsersDao#getUserIdByLogin(java.lang.
         * String)
         */
        @Override
        public int getUserIdByLogin(String login) {
            Connection connection = null;
            PreparedStatement stmt = null;
            ResultSet rs = null;
            try {
                connection = DbConnector.getConnection();
                stmt = connection.prepareStatement(Constants.UsersDao.SELECT_USER_ID_BY_LOGIN);
                stmt.setString(1, login);
                rs = stmt.executeQuery();
                while (rs.next()) {
                    return rs.getInt(1);
                }

            } catch (SQLException e) {
                LOG.error(e.getMessage());
                return 0;
            } finally {
                DbConnector.close(connection, stmt, rs);
            }
            return 0;
        }


    }

Here is my Service class

   public class MySqlUsersService implements UsersService {

    private UsersDao usersDao;
    private TransactionManager transactionManager;

    public MySqlUsersService(UsersDao usersDao, TransactionManager transactionManager) {
        this.usersDao = usersDao;
        this.transactionManager = transactionManager;
    }

    @Override
    public int getUserIdByLogin(String login) {
        return this.transactionManager.execute(() -> this.usersDao.getUserIdByLogin(login));
    }

}

And here is my test class with Mockito

public class UsersServiceTest {
private static MySqlUsersService mockedUsersService;
private static TransactionManager transactionManager;
private static UsersDao usersDao;
private static Users user1;

@BeforeClass
public static void init() {
    user1=mock(Users.class);
    usersDao = mock(MySqlUsersDao.class);
    transactionManager = mock(TransactionManager.class);
    mockedUsersService = new MySqlUsersService(usersDao, transactionManager);

}

@Test
public void testGetUserByLogin() {
    // Users user = mockedUsersService.getUserByLogin("user1");
    when(usersDao.getUserByLogin("user1")).thenReturn(user1);
    assertEquals(user1,mockedUsersService.getUserByLogin("user1")); 
    verify(transactionManager).execute(()->usersDao.getUserByLogin("user1"));

}
}