### Question:
OrderServiceImpl implements OrderService { @Override public Response findOrderById(UUID id, HttpHeaders headers) { Order order = orderRepository.findById(id); if (order == null) { return new Response<>(0, "No Content by this id", null); } else { return new Response<>(1, success, order); } }  @Override Response getSoldTickets(Seat seatRequest, HttpHeaders headers); @Override Response findOrderById(UUID id, HttpHeaders headers); @Override Response create(Order order, HttpHeaders headers); @Override Response alterOrder(OrderAlterInfo oai, HttpHeaders headers); @Override Response<ArrayList<Order>> queryOrders(OrderInfo qi, String accountId, HttpHeaders headers); @Override Response queryOrdersForRefresh(OrderInfo qi, String accountId, HttpHeaders headers); List<String> queryForStationId(List<String> ids, HttpHeaders headers); @Override Response saveChanges(Order order, HttpHeaders headers); @Override Response cancelOrder(UUID accountId, UUID orderId, HttpHeaders headers); @Override Response queryAlreadySoldOrders(Date travelDate, String trainNumber, HttpHeaders headers); @Override Response getAllOrders(HttpHeaders headers); @Override Response modifyOrder(String orderId, int status, HttpHeaders headers); @Override Response getOrderPrice(String orderId, HttpHeaders headers); @Override Response payOrder(String orderId, HttpHeaders headers); @Override Response getOrderById(String orderId, HttpHeaders headers); @Override void initOrder(Order order, HttpHeaders headers); @Override Response checkSecurityAboutOrder(Date dateFrom, String accountId, HttpHeaders headers); @Override Response deleteOrder(String orderId, HttpHeaders headers); @Override Response addNewOrder(Order order, HttpHeaders headers); @Override Response updateOrder(Order order, HttpHeaders headers);  }### Answer:
@Test public void testFindOrderById1() { UUID id = UUID.randomUUID(); Mockito.when(orderRepository.findById(Mockito.any(UUID.class))).thenReturn(null); Response result = orderServiceImpl.findOrderById(id, headers); Assert.assertEquals(new Response<>(0, "No Content by this id", null), result); }
@Test public void testFindOrderById2() { UUID id = UUID.randomUUID(); Order order = new Order(); Mockito.when(orderRepository.findById(Mockito.any(UUID.class))).thenReturn(order); Response result = orderServiceImpl.findOrderById(id, headers); Assert.assertEquals(new Response<>(1, "Success", order), result); }