code: def test_iter(self):
      self.assertEqual(set(self.figure), {"data", "layout", "frames"})
  
imports: from unittest import TestCase
  import pytest
  import plotly.graph_objs
  import plotly.io
label_desc: Use image node_id 5 for calling the TestFigureProperties obj's underlying member method code with example usage: obj.test_iter() without return types