code: def test_option_in_parent():
      x = int64
      y = Option(float32)
      z = optionify(x, y, y)
      assert z == y
  
file_path: datashader/datashader/datashape/tests/test_promote.py
imports: import pytest
  from datashader.datashape import promote, Option, float64, int64, float32, optionify, string, datetime_, dshape
label_desc: Use image node_id 4 for calling a global function with example usage: test_option_in_parent() without return types