### Question:
StoreApi { public Order getOrderById(Long orderId) throws IOException { HttpResponse response = getOrderByIdForHttpResponse(orderId); TypeReference<Order> typeRef = new TypeReference<Order>() {}; return apiClient.getObjectMapper().readValue(response.getContent(), typeRef); } StoreApi();  StoreApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); void deleteOrder(String orderId); void deleteOrder(String orderId, Map<String, Object> params); HttpResponse deleteOrderForHttpResponse(String orderId); HttpResponse deleteOrderForHttpResponse(String orderId, Map<String, Object> params); Map<String, Integer> getInventory(); Map<String, Integer> getInventory(Map<String, Object> params); HttpResponse getInventoryForHttpResponse(); HttpResponse getInventoryForHttpResponse(Map<String, Object> params); Order getOrderById(Long orderId); Order getOrderById(Long orderId, Map<String, Object> params); HttpResponse getOrderByIdForHttpResponse(Long orderId); HttpResponse getOrderByIdForHttpResponse(Long orderId, Map<String, Object> params); Order placeOrder(Order body); Order placeOrder(Order body, Map<String, Object> params); HttpResponse placeOrderForHttpResponse(Order body); HttpResponse placeOrderForHttpResponse(java.io.InputStream body, String mediaType); HttpResponse placeOrderForHttpResponse(Order body, Map<String, Object> params);  }### Answer:
@Test public void getOrderByIdTest() throws IOException { Long orderId = null; Order response = api.getOrderById(orderId); }