### Question:
SmsApi { public String retrieveAll() throws ApiException { ApiResponse<String> resp = retrieveAllWithHttpInfo(); return resp.getData(); } SmsApi();  SmsApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); com.squareup.okhttp.Call createCall(String body, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String create(String body); ApiResponse<String> createWithHttpInfo(String body); com.squareup.okhttp.Call createAsync(String body, final ApiCallback<String> callback); com.squareup.okhttp.Call deleteCall(Long resourceId, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String delete(Long resourceId); ApiResponse<String> deleteWithHttpInfo(Long resourceId); com.squareup.okhttp.Call deleteAsync(Long resourceId, final ApiCallback<String> callback); com.squareup.okhttp.Call retrieveAllCall(final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String retrieveAll(); ApiResponse<String> retrieveAllWithHttpInfo(); com.squareup.okhttp.Call retrieveAllAsync(final ApiCallback<String> callback); com.squareup.okhttp.Call retrieveAllSmsByStatusCall(Long campaignId, Long status, String fromDate, String toDate, String locale, String dateFormat, String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String retrieveAllSmsByStatus(Long campaignId, Long status, String fromDate, String toDate, String locale, String dateFormat, String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder); ApiResponse<String> retrieveAllSmsByStatusWithHttpInfo(Long campaignId, Long status, String fromDate, String toDate, String locale, String dateFormat, String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder); com.squareup.okhttp.Call retrieveAllSmsByStatusAsync(Long campaignId, Long status, String fromDate, String toDate, String locale, String dateFormat, String sqlSearch, Integer offset, Integer limit, String orderBy, String sortOrder, final ApiCallback<String> callback); com.squareup.okhttp.Call retrieveOneCall(Long resourceId, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String retrieveOne(Long resourceId); ApiResponse<String> retrieveOneWithHttpInfo(Long resourceId); com.squareup.okhttp.Call retrieveOneAsync(Long resourceId, final ApiCallback<String> callback); com.squareup.okhttp.Call updateCall(Long resourceId, String body, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); String update(Long resourceId, String body); ApiResponse<String> updateWithHttpInfo(Long resourceId, String body); com.squareup.okhttp.Call updateAsync(Long resourceId, String body, final ApiCallback<String> callback);  }### Answer:
@Test public void retrieveAllTest() throws ApiException { String response = api.retrieveAll(); }