code: def test_fill_slicer():
      # Test slice length calculation
      assert fill_slicer(slice(None), 10) == slice(0, 10, 1)
      assert fill_slicer(slice(11), 10) == slice(0, 10, 1)
      assert fill_slicer(slice(1, 11), 10) == slice(1, 10, 1)
      assert fill_slicer(slice(1, 1), 10) == slice(1, 1, 1)
      assert fill_slicer(slice(1, 11, 2), 10) == slice(1, 10, 2)
      assert fill_slicer(slice(0, 11, 3), 10) == slice(0, 10, 3)
      assert fill_slicer(slice(1, 11, 3), 10) == slice(1, 10, 3)
      assert fill_slicer(slice(None, None, -1), 10) == slice(
          9, None, -1
      )
      assert fill_slicer(slice(11, None, -1), 10) == slice(9, None, -1)
      assert fill_slicer(slice(None, 1, -1), 10) == slice(9, 1, -1)
      assert fill_slicer(slice(None, None, -2), 10) == slice(
          9, None, -2
      )
      assert fill_slicer(slice(None, None, -3), 10) == slice(
          9, None, -3
      )
      assert fill_slicer(slice(None, 0, -3), 10) == slice(9, 0, -3)
      # Start, end are always taken to be relative if negative
      assert fill_slicer(slice(None, -4, -1), 10) == slice(9, 6, -1)
      assert fill_slicer(slice(-4, -2, 1), 10) == slice(6, 8, 1)
      # start after stop
      assert fill_slicer(slice(3, 2, 1), 10) == slice(3, 2, 1)
      assert fill_slicer(slice(2, 3, -1), 10) == slice(2, 3, -1)
  
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 7 for calling a global function with example usage: test_fill_slicer() without return types