code: def test_total_data_size(self, histogram_indexer):
      assert histogram_indexer.total_data_size() == 10
  
file_path: FATE/python/fate/test/histogram/indexer.py
imports: import pytest
  from fate_utils.histogram import HistogramIndexer, Shuffler
label_desc: Use image node_id 6 for calling the TestHistogramIndexer obj's underlying member method code with example usage: obj.test_total_data_size(histogram_indexer) without return types