code: def test_sort(self):
      # Sort alphabetically
      report = BarChart(
          self.data,
          self.cols,
          model_name=self.model_name,
          dataset_name=self.dataset_name,
      )
      report.sort()
      actual = report.data
      expected = pd.DataFrame(
          [
              ["Cat A", "Slice A", 0.3, 15, 5000],
              ["Cat A", "Slice C", 0.1, 5, 300],
              ["Cat B", "Slice B", 0.4, 20, 812],
              ["Cat B", "Slice D", 0.5, 25, 13312],
              ["Cat C", "Slice A", 0.2, 10, 3],
          ]
      )
      self.assertTrue(actual.equals(expected))
  
      # Sort by specified category order
      report = BarChart(
          self.data,
          self.cols,
          model_name=self.model_name,
          dataset_name=self.dataset_name,
      )
      report.sort(
          category_order={
              "Cat B": 0,
              "Cat C": 2,
              "Cat A": 1,
          }
      )
      actual = report.data
      expected = pd.DataFrame(
          [
              ["Cat B", "Slice B", 0.4, 20, 812],
              ["Cat B", "Slice D", 0.5, 25, 13312],
              ["Cat A", "Slice A", 0.3, 15, 5000],
              ["Cat A", "Slice C", 0.1, 5, 300],
              ["Cat C", "Slice A", 0.2, 10, 3],
          ]
      )
      self.assertTrue(actual.equals(expected))
  
      # Sort by specified slice order
      report = BarChart(
          self.data,
          self.cols,
          model_name=self.model_name,
          dataset_name=self.dataset_name,
      )
      report.sort(
          slice_order={
              "Slice D": 0,
              "Slice C": 1,
              "Slice B": 2,
              "Slice A": 3,
          }
      )
      actual = report.data
      expected = pd.DataFrame(
          [
              ["Cat A", "Slice C", 0.1, 5, 300],
              ["Cat A", "Slice A", 0.3, 15, 5000],
              ["Cat B", "Slice D", 0.5, 25, 13312],
              ["Cat B", "Slice B", 0.4, 20, 812],
              ["Cat C", "Slice A", 0.2, 10, 3],
          ]
      )
      self.assertTrue(actual.equals(expected))
  
      # Sort by specified category order and slice order
      report = BarChart(
          self.data,
          self.cols,
          model_name=self.model_name,
          dataset_name=self.dataset_name,
      )
      report.sort(
          category_order={
              "Cat B": 0,
              "Cat C": 2,
              "Cat A": 1,
          },
          slice_order={
              "Slice D": 0,
              "Slice C": 1,
              "Slice B": 2,
              "Slice A": 3,
          },
      )
      actual = report.data
      expected = pd.DataFrame(
          [
              ["Cat B", "Slice D", 0.5, 25, 13312],
              ["Cat B", "Slice B", 0.4, 20, 812],
              ["Cat A", "Slice C", 0.1, 5, 300],
              ["Cat A", "Slice A", 0.3, 15, 5000],
              ["Cat C", "Slice A", 0.2, 10, 3],
          ]
      )
      self.assertTrue(actual.equals(expected))
  
file_path: textflint/test/report/report_generator/test_report_generator.py
imports: import unittest
  import pandas
  from textflint.report.analyzer.analyzer import *
  from textflint.report.report_generator.report_generator import BarChart, ReportGenerator
label_desc: Use image node_id 3 for calling the TestBarChart obj's underlying member method code with example usage: obj.test_sort() without return types