code: def test_splits_into_k(self, histogram_indexer):
      # Test if the method splits the data correctly into k parts
      k = 2
      splits = list(histogram_indexer.splits_into_k(k))
  
      assert len(splits) == k
  
      # Check if the intervals are disjoint and cover the entire range
      all_intervals = [
          interval
          for _, _, intervals in splits
          for interval in intervals
      ]
      all_intervals.sort(key=lambda x: x[0])
  
      assert all_intervals[0][0] == 0
      assert all_intervals[-1][1] == histogram_indexer.total_data_size()
      for i in range(len(all_intervals) - 1):
          assert all_intervals[i][1] == all_intervals[i + 1][0]
  
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 7 for calling the TestHistogramIndexer obj's underlying member method code with example usage: obj.test_splits_into_k(histogram_indexer) without return types