code: def test_set_default_options():
      from deepchem.utils.differentiation_utils import (
          set_default_option,
      )
  
      assert set_default_option({"a": 1, "b": 2}, {"a": 3}) == {
          "a": 3,
          "b": 2,
      }
  
imports: import pytest
label_desc: Use image node_id 21 for calling a global function with example usage: test_set_default_options() without return types