code: def test_perform_univariate_dataframe_analysis_2(self):
      df = None
      d = perform_univariate_dataframe_analysis(
          df, col_types=compute_col_types(df)
      )
      assert d == {}
  
file_path: shapash/tests/unit_tests/report/test_data_analysis.py
imports: import unittest
  from unittest import TestCase
  import pandas
  import numpy
  from shapash.report.data_analysis import perform_global_dataframe_analysis, perform_univariate_dataframe_analysis
  from shapash.report.common import compute_col_types
label_desc: Use image node_id 4 for calling the TestDataAnalysis obj's underlying member method code with example usage: obj.test_perform_univariate_dataframe_analysis_2() without return types