/** Test of changing number of beds in room */ @Test public void changeNumberOfBedsTest() { int numberOfBeds = 34; doAnswer( invocationOnMock -> { room1.setNumberOfBeds(numberOfBeds); return null; }) .when(roomDao) .update(any(Room.class)); assertNotEquals(room1.getNumberOfBeds(), numberOfBeds); roomService.changeNumberOfBeds(room1, numberOfBeds); verify(roomDao).update(any(Room.class)); assertEquals(room1.getNumberOfBeds(), numberOfBeds); }