### Question:
FakeClassnameTags123Api { public Mono<Client> testClassname(Client body) throws WebClientResponseException { Object postBody = body; if (body == null) { throw new WebClientResponseException("Missing the required parameter 'body' when calling testClassname", 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/json" }; final List<MediaType> localVarAccept = apiClient.selectHeaderAccept(localVarAccepts); final String[] localVarContentTypes = { "application/json" }; final MediaType localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes); String[] localVarAuthNames = new String[] { "api_key_query" }; ParameterizedTypeReference<Client> localVarReturnType = new ParameterizedTypeReference<Client>() {}; return apiClient.invokeAPI("/fake_classname_test", HttpMethod.PATCH, pathParams, queryParams, postBody, headerParams, cookieParams, formParams, localVarAccept, localVarContentType, localVarAuthNames, localVarReturnType); } FakeClassnameTags123Api(); @Autowired  FakeClassnameTags123Api(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); Mono<Client> testClassname(Client body);  }### Answer:
@Test public void testClassnameTest() { Client client = null; Client response = api.testClassname(client).block(); }