code: def test_not_case_sensitive(dataframe):
      """Checks a new column is added containing the correct distinct count,
      when case sensitive is False.
      """
      dataframe["ccu"] = ["a", "b", "c", "A", "B", "C", "a", "b", "c"]
      df = dataframe.count_cumulative_unique(
          "ccu",
          dest_column_name="ccu_count",
          case_sensitive=False,
      )
  
      assert all(df["ccu_count"] == [1, 2, 3, 3, 3, 3, 3, 3, 3])
  
file_path: pyjanitor/tests/functions/test_count_cumulative_unique.py
imports: import numpy
  import pandas
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_not_case_sensitive(dataframe) without return types