### Question:
SmsCampaignsApi { public String delete(Long campaignId) throws ApiException { ApiResponse<String> resp = deleteWithHttpInfo(campaignId); return resp.getData(); } SmsCampaignsApi();  SmsCampaignsApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); com.squareup.okhttp.Call createCampaignCall(CommandWrapper body, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String createCampaign(CommandWrapper body); ApiResponse<String> createCampaignWithHttpInfo(CommandWrapper body); com.squareup.okhttp.Call createCampaignAsync(CommandWrapper body, final ApiCallback<String> callback); com.squareup.okhttp.Call deleteCall(Long campaignId, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String delete(Long campaignId); ApiResponse<String> deleteWithHttpInfo(Long campaignId); com.squareup.okhttp.Call deleteAsync(Long campaignId, final ApiCallback<String> callback); com.squareup.okhttp.Call handleCommandsCall(Long campaignId, String command, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String handleCommands(Long campaignId, String command); ApiResponse<String> handleCommandsWithHttpInfo(Long campaignId, String command); com.squareup.okhttp.Call handleCommandsAsync(Long campaignId, String command, final ApiCallback<String> callback); com.squareup.okhttp.Call previewCall(String body, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String preview(String body); ApiResponse<String> previewWithHttpInfo(String body); com.squareup.okhttp.Call previewAsync(String body, final ApiCallback<String> callback); com.squareup.okhttp.Call retrieveAllEmailsCall(String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String retrieveAllEmails(String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder); ApiResponse<String> retrieveAllEmailsWithHttpInfo(String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder); com.squareup.okhttp.Call retrieveAllEmailsAsync(String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder, final ApiCallback<String> callback); com.squareup.okhttp.Call retrieveCampaignCall(Long resourceId, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String retrieveCampaign(Long resourceId); ApiResponse<String> retrieveCampaignWithHttpInfo(Long resourceId); com.squareup.okhttp.Call retrieveCampaignAsync(Long resourceId, final ApiCallback<String> callback); com.squareup.okhttp.Call templateCall(final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String template(); ApiResponse<String> templateWithHttpInfo(); com.squareup.okhttp.Call templateAsync(final ApiCallback<String> callback); com.squareup.okhttp.Call updateCampaignCall(Long campaignId, CommandWrapper body, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String updateCampaign(Long campaignId, CommandWrapper body); ApiResponse<String> updateCampaignWithHttpInfo(Long campaignId, CommandWrapper body); com.squareup.okhttp.Call updateCampaignAsync(Long campaignId, CommandWrapper body, final ApiCallback<String> callback);  }### Answer:
@Test public void deleteTest() throws ApiException { Long campaignId = null; String response = api.delete(campaignId); }