code: def test_packability():
      assert adjust_cores_for_packability(0) == 250
      assert adjust_cores_for_packability(200) == 250
      assert adjust_cores_for_packability(250) == 250
      assert adjust_cores_for_packability(251) == 500
      assert adjust_cores_for_packability(500) == 500
      assert adjust_cores_for_packability(501) == 1000
      assert adjust_cores_for_packability(1000) == 1000
      assert adjust_cores_for_packability(1001) == 2000
      assert adjust_cores_for_packability(2000) == 2000
      assert adjust_cores_for_packability(2001) == 4000
      assert adjust_cores_for_packability(3000) == 4000
      assert adjust_cores_for_packability(4000) == 4000
      assert adjust_cores_for_packability(4001) == 8000
      assert adjust_cores_for_packability(8001) == 16000
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_packability() without return types