code: def test_update_dictionary():
      a = {"a": 1, "b": 2}
      b = {"b": 3, "c": 4}
      c = util.update_dictionary(a, b)
      assert c == {"a": 1, "b": 3, "c": 4}
  
imports: from jax import numpy
  from jaxdf import util
  from jaxdf.operators.differential import gradient
label_desc: Use image node_id 2 for calling a global function with example usage: test_update_dictionary() without return types