code: def test_extract_keys():
      d = {"x": 2, "y": 3, "z": 4}
  
      assert filter_keys(d, ["x", "y"]) == {"x": 2, "y": 3}
      assert filter_keys(d, ["w"]) == {}
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_extract_keys() without return types