### Question:
FakeClassnameTags123Api { public CompletableFuture<Client> testClassname(Client body) throws ApiException { try { HttpRequest.Builder localVarRequestBuilder = testClassnameRequestBuilder(body); return memberVarHttpClient.sendAsync( localVarRequestBuilder.build(), HttpResponse.BodyHandlers.ofString()).thenComposeAsync(localVarResponse -> { if (localVarResponse.statusCode()/ 100 != 2) { return CompletableFuture.failedFuture(getApiException("testClassname", localVarResponse)); } try { return CompletableFuture.completedFuture( memberVarObjectMapper.readValue(localVarResponse.body(), new TypeReference<Client>() {}) ); } catch (IOException e) { return CompletableFuture.failedFuture(new ApiException(e)); } }); } catch (ApiException e) { return CompletableFuture.failedFuture(e); } } FakeClassnameTags123Api();  FakeClassnameTags123Api(ApiClient apiClient); CompletableFuture<Client> testClassname(Client body); CompletableFuture<ApiResponse<Client>> testClassnameWithHttpInfo(Client body);  }### Answer:
@Test public void testClassnameTest() throws ApiException { Client body = null; CompletableFuture<Client> response = api.testClassname(body); }