@Before
 public void setUp() {
   when(addressService.getFrontendAddress()).thenReturn(to);
   when(messageSystem.getAddressService()).thenReturn(addressService);
   when(mechanicService.getAddress()).thenReturn(from);
   when(mechanicService.getMessageSystem()).thenReturn(messageSystem);
 }
 @Override
 protected void exec(GameMechanics gameMechanics) {
   gameMechanics.removeUser(userProfile);
 }