code: def test_fileslice_dtype():
      # Test that any valid dtype specifier works for fileslice
      sliceobj = (slice(None), slice(2))
      for dt in (
          np.dtype("int32"),
          np.int32,
          "i4",
          "int32",
          ">i4",
          "<i4",
      ):
          arr = np.arange(24, dtype=dt).reshape((2, 3, 4))
          fobj = BytesIO(arr.tobytes())
          new_slice = fileslice(fobj, sliceobj, arr.shape, dt)
          assert_array_equal(arr[sliceobj], new_slice)
  
imports: import time
  from functools import partial
  from io import BytesIO
  from itertools import product
  from threading import Lock, Thread
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from ..fileslice import _positive_slice, _simple_fileslice, calc_slicedefs, canonical_slicers, fileslice, fill_slicer, is_fancy, optimize_read_slicers, optimize_slicer, predict_shape, read_segments, slice2len, slice2outax, slicers2segments, strided_scalar, threshold_heuristic
label_desc: Use image node_id 25 for calling a global function with example usage: test_fileslice_dtype() without return types