code: def test_blockwise_kwargs():
      def f(a, b=0):
          return a + b
  
      x = da.ones(5, chunks=(2,))
      y = da.blockwise(f, "i", x, "i", b=10, dtype=x.dtype)
      assert_eq(y, np.ones(5) + 10)
  
imports: from __future__ import annotations
  import collections
  from operator import add
  import numpy
  import pytest
  import dask
  import dask.array
  from dask.array.utils import assert_eq
  from dask.blockwise import _BLOCKWISE_DEFAULT_PREFIX, Blockwise, _unique_dep, index_subs, optimize_blockwise, rewrite_blockwise
  from dask.highlevelgraph import HighLevelGraph
  from dask.utils_test import dec, hlg_layer_topological, inc
label_desc: Use image node_id 21 for calling a global function with example usage: test_blockwise_kwargs() and returns: unknown