code: def test__positive_slice():
      # Reverse slice direction to be positive
      assert _positive_slice(slice(0, 5, 1)) == slice(0, 5, 1)
      assert _positive_slice(slice(1, 5, 3)) == slice(1, 5, 3)
      assert _positive_slice(slice(4, None, -2)) == slice(0, 5, 2)
      assert _positive_slice(slice(4, None, -1)) == slice(0, 5, 1)
      assert _positive_slice(slice(4, 1, -1)) == slice(2, 5, 1)
      assert _positive_slice(slice(4, 1, -2)) == slice(2, 5, 2)
  
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 8 for calling a global function with example usage: test__positive_slice() without return types