### Question:
StoreApi { public Mono<Order> placeOrder(Order body) throws WebClientResponseException { Object postBody = body; if (body == null) { throw new WebClientResponseException("Missing the required parameter 'body' when calling placeOrder", HttpStatus.BAD_REQUEST.value(), HttpStatus.BAD_REQUEST.getReasonPhrase(), null, null, null); } final Map<String, Object> pathParams = new HashMap<String, Object>(); final MultiValueMap<String, String> queryParams = new LinkedMultiValueMap<String, String>(); final HttpHeaders headerParams = new HttpHeaders(); final MultiValueMap<String, String> cookieParams = new LinkedMultiValueMap<String, String>(); final MultiValueMap<String, Object> formParams = new LinkedMultiValueMap<String, Object>(); final String[] localVarAccepts = { "application/xml", "application/json" }; final List<MediaType> localVarAccept = apiClient.selectHeaderAccept(localVarAccepts); final String[] localVarContentTypes = { }; final MediaType localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes); String[] localVarAuthNames = new String[] { }; ParameterizedTypeReference<Order> localVarReturnType = new ParameterizedTypeReference<Order>() {}; return apiClient.invokeAPI("/store/order", HttpMethod.POST, pathParams, queryParams, postBody, headerParams, cookieParams, formParams, localVarAccept, localVarContentType, localVarAuthNames, localVarReturnType); } StoreApi(); @Autowired  StoreApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); Mono<Void> deleteOrder(String orderId); Mono<Map<String, Integer>> getInventory(); Mono<Order> getOrderById(Long orderId); Mono<Order> placeOrder(Order body);  }### Answer:
@Test public void placeOrderTest() { Order order = null; Order response = api.placeOrder(order).block(); }