code: def test_empty_usecols(all_parsers):
      data = "a,b,c\n1,2,3\n4,5,6"
      expected = DataFrame(columns=Index([]))
      parser = all_parsers
  
      result = parser.read_csv(StringIO(data), usecols=set())
      tm.assert_frame_equal(result, expected)
  
imports: from io import StringIO
  import numpy
  import pytest
  from pandas.errors import ParserError
  from pandas import DataFrame, Index, array
  import pandas._testing
label_desc: Use image node_id 17 for calling a global function with example usage: test_empty_usecols(all_parsers) without return types