code: def test_overlap_small():
      x = da.ones((10, 10), chunks=(5, 5))
  
      y = x.map_overlap(lambda x: x, depth=1, boundary="none")
      assert len(y.dask) < 200
  
      y = x.map_overlap(lambda x: x, depth=1, boundary="none")
      assert len(y.dask) < 100
  
imports: from __future__ import annotations
  import pytest
  import numpy
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  import dask.array
  from dask.array.lib.stride_tricks import sliding_window_view
  from dask.array.overlap import boundaries, constant, ensure_minimum_chunksize, nearest, overlap, overlap_internal, periodic, reflect, trim_internal
  from dask.array.utils import assert_eq, same_keys
label_desc: Use image node_id 32 for calling a global function with example usage: test_overlap_small() without return types