code: def test_concat_frame_with_sort_false(self):
      # GH 43375
      result = pd.concat(
          [DataFrame({i: i}, index=[i]) for i in range(2, 0, -1)],
          sort=False,
      )
      expected = DataFrame(
          [[2, np.nan], [np.nan, 1]], index=[2, 1], columns=[2, 1]
      )
  
      tm.assert_frame_equal(result, expected)
  
      # GH 37937
      df1 = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}, index=[1, 2, 3])
      df2 = DataFrame(
          {"c": [7, 8, 9], "d": [10, 11, 12]}, index=[3, 1, 6]
      )
      result = pd.concat([df2, df1], axis=1, sort=False)
      expected = DataFrame(
          [
              [7.0, 10.0, 3.0, 6.0],
              [8.0, 11.0, 1.0, 4.0],
              [9.0, 12.0, np.nan, np.nan],
              [np.nan, np.nan, 2.0, 5.0],
          ],
          index=[3, 1, 6, 2],
          columns=["c", "d", "a", "b"],
      )
      tm.assert_frame_equal(result, expected)
  
file_path: pandas/pandas/tests/reshape/concat/test_sort.py
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame
  import pandas._testing
label_desc: Use image node_id 6 for calling the TestConcatSort obj's underlying member method code with example usage: obj.test_concat_frame_with_sort_false() without return types