### Question:
UserApi { public CompletableFuture<Void> deleteUser(String username) throws ApiException { try { HttpRequest.Builder localVarRequestBuilder = deleteUserRequestBuilder(username); return memberVarHttpClient.sendAsync( localVarRequestBuilder.build(), HttpResponse.BodyHandlers.ofString()).thenComposeAsync(localVarResponse -> { if (localVarResponse.statusCode()/ 100 != 2) { return CompletableFuture.failedFuture(getApiException("deleteUser", localVarResponse)); } return CompletableFuture.completedFuture(null); }); } catch (ApiException e) { return CompletableFuture.failedFuture(e); } } UserApi();  UserApi(ApiClient apiClient); CompletableFuture<Void> createUser(User body); CompletableFuture<ApiResponse<Void>> createUserWithHttpInfo(User body); CompletableFuture<Void> createUsersWithArrayInput(List<User> body); CompletableFuture<ApiResponse<Void>> createUsersWithArrayInputWithHttpInfo(List<User> body); CompletableFuture<Void> createUsersWithListInput(List<User> body); CompletableFuture<ApiResponse<Void>> createUsersWithListInputWithHttpInfo(List<User> body); CompletableFuture<Void> deleteUser(String username); CompletableFuture<ApiResponse<Void>> deleteUserWithHttpInfo(String username); CompletableFuture<User> getUserByName(String username); CompletableFuture<ApiResponse<User>> getUserByNameWithHttpInfo(String username); CompletableFuture<String> loginUser(String username, String password); CompletableFuture<ApiResponse<String>> loginUserWithHttpInfo(String username, String password); CompletableFuture<Void> logoutUser(); CompletableFuture<ApiResponse<Void>> logoutUserWithHttpInfo(); CompletableFuture<Void> updateUser(String username, User body); CompletableFuture<ApiResponse<Void>> updateUserWithHttpInfo(String username, User body);  }### Answer:
@Test public void deleteUserTest() throws ApiException { String username = null; CompletableFuture<Void> response = api.deleteUser(username); }