code: def test_dtype_multi_index(all_parsers):
      # GH 42446
      parser = all_parsers
      data = "A,B,B\nX,Y,Z\n1,2,3"
  
      result = parser.read_csv(
          StringIO(data),
          header=list(range(2)),
          dtype={
              ("A", "X"): np.int32,
              ("B", "Y"): np.int32,
              ("B", "Z"): np.float32,
          },
      )
  
      expected = DataFrame(
          {
              ("A", "X"): np.int32([1]),
              ("B", "Y"): np.int32([2]),
              ("B", "Z"): np.float32([3]),
          }
      )
  
      tm.assert_frame_equal(result, expected)
  
imports: from collections import defaultdict
  from io import StringIO
  import numpy
  import pytest
  from pandas.errors import ParserWarning
  import pandas
  from pandas import DataFrame, Timestamp
  import pandas._testing
  from pandas.core.arrays import ArrowStringArray, IntegerArray, StringArray
label_desc: Use image node_id 16 for calling a global function with example usage: test_dtype_multi_index(all_parsers) without return types