### Question:
StoreApi { public Order getOrderById(Long orderId) throws ApiException { return getOrderByIdWithHttpInfo(orderId).getData(); } StoreApi();  StoreApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); void deleteOrder(String orderId); ApiResponse<Void> deleteOrderWithHttpInfo(String orderId); Map<String, Integer> getInventory(); ApiResponse<Map<String, Integer>> getInventoryWithHttpInfo(); Order getOrderById(Long orderId); ApiResponse<Order> getOrderByIdWithHttpInfo(Long orderId); Order placeOrder(Order body); ApiResponse<Order> placeOrderWithHttpInfo(Order body);  }### Answer:
@Test public void getOrderByIdTest() throws ApiException { Long orderId = null; Order response = api.getOrderById(orderId); }