code: def test_assign_subplots(self):
      self.assertIsNone(self.layout.xaxis.title.text)
      self.assertIsNone(self.layout.xaxis1.title.text)
  
      title_str = "xaxis title"
      self.layout.xaxis.title.text = title_str
      self.assertEqual(self.layout.xaxis.title.text, title_str)
      self.assertEqual(self.layout.xaxis1.title.text, title_str)
  
file_path: plotly.py/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_layout_subplots.py
imports: from unittest import TestCase
  import pytest
  import plotly.graph_objs
  import plotly.io
label_desc: Use image node_id 6 for calling the TestLayoutSubplots obj's underlying member method code with example usage: obj.test_assign_subplots() without return types