code: def test_ratio_dropped(self, bins, expected_ratios):
      histogram = hist.Histogram("name", bins)
      output = hist.compute_ratio_dropped(histogram)
      self.assertListEqual(output, expected_ratios)
  
file_path: pipelinedp/tests/dataset_histograms/histograms_test.py
imports: from typing import Union, List
  from absl.testing import absltest
  from absl.testing import parameterized
  from pipeline_dp.dataset_histograms import histograms
  from pipeline_dp.dataset_histograms.histograms import HistogramType, FrequencyBin
label_desc: Use image node_id 2 for calling the HistogramTest obj's underlying member method code with example usage: obj.test_ratio_dropped(bins, expected_ratios) without return types