code: def test_mixed_column_selection(self):
      # mixed column selection
      # GH 5639
      dfbool = DataFrame(
          {
              "one": Series([True, True, False], index=["a", "b", "c"]),
              "two": Series(
                  [False, False, True, False],
                  index=["a", "b", "c", "d"],
              ),
              "three": Series(
                  [False, True, True, True], index=["a", "b", "c", "d"]
              ),
          }
      )
      expected = pd.concat(
          [dfbool["one"], dfbool["three"], dfbool["one"]], axis=1
      )
      result = dfbool[["one", "three", "one"]]
      tm.assert_frame_equal(result, expected)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Series, date_range
  import pandas._testing
label_desc: Use image node_id 8 for calling the TestDataFrameNonuniqueIndexes obj's underlying member method code with example usage: obj.test_mixed_column_selection() without return types