code: @Cmd
  	public void prepareNextDataSet(final String dataSetKey) {
  		checkArgument(dataSetKey != null, "Global 'prepareNextDataSet' is not allowed. Please specify a data set key.");
  		log.info("Preparing new data for dataSetKey={}", dataSetKey);
  		dataSourceProvider.get().getNextDataSet(resolveProperty(dataSetKey));
  	}
docs: Prepares the next {@link DataSet} with the specified key for use. Depending on the type of
  {@link DataSource}, this may trigger data generation.
  
  @param dataSetKey
  the key of the {@link DataSet}
  @since 3.1.0