### Question:
StoreApi { public Order getOrderById(Long orderId) throws ApiException { ApiResponse<Order> localVarResp = getOrderByIdWithHttpInfo(orderId); return localVarResp.getData(); } StoreApi();  StoreApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); okhttp3.Call deleteOrderCall(String orderId, final ApiCallback _callback); void deleteOrder(String orderId); ApiResponse<Void> deleteOrderWithHttpInfo(String orderId); okhttp3.Call deleteOrderAsync(String orderId, final ApiCallback<Void> _callback); okhttp3.Call getInventoryCall(final ApiCallback _callback); Map<String, Integer> getInventory(); ApiResponse<Map<String, Integer>> getInventoryWithHttpInfo(); okhttp3.Call getInventoryAsync(final ApiCallback<Map<String, Integer>> _callback); okhttp3.Call getOrderByIdCall(Long orderId, final ApiCallback _callback); Order getOrderById(Long orderId); ApiResponse<Order> getOrderByIdWithHttpInfo(Long orderId); okhttp3.Call getOrderByIdAsync(Long orderId, final ApiCallback<Order> _callback); okhttp3.Call placeOrderCall(Order body, final ApiCallback _callback); Order placeOrder(Order body); ApiResponse<Order> placeOrderWithHttpInfo(Order body); okhttp3.Call placeOrderAsync(Order body, final ApiCallback<Order> _callback);  }### Answer:
@Test public void getOrderByIdTest() throws ApiException { Long orderId = null; Order response = api.getOrderById(orderId); }