code: def test_remove_no_op_slices_for_getitem(getitem):
      null = slice(0, None)
      opts = [
          ((getitem, "x", null, False, False), "x"),
          ((getitem, (getitem, "x", null, False, False), null), "x"),
          (
              (getitem, (getitem, "x", (null, null), False, False), ()),
              "x",
          ),
      ]
      for orig, final in opts:
          _assert_getter_dsk_eq(
              optimize_slices({"a": orig}), {"a": final}
          )
  
imports: from __future__ import annotations
  import pytest
  import numpy
  import dask
  import dask.array
  from dask.array.chunk import getitem
  from dask.array.core import getter
  from dask.array.core import getter_nofancy
  from dask.array.optimization import _is_getter_task, fuse_slice, optimize, optimize_blockwise, optimize_slices
  from dask.array.utils import assert_eq
  from dask.highlevelgraph import HighLevelGraph
  from dask.optimization import SubgraphCallable, fuse
  from dask.utils import SerializableLock
label_desc: Use image node_id 19 for calling a global function with example usage: test_remove_no_op_slices_for_getitem(getitem) without return types