code: def test_defaults_in_property_assignment(self):
      fig = go.Figure()
  
      fig.layout.template.layout.sliderdefaults = go.layout.Slider(
          bgcolor="green"
      )
  
      self.assertEqual(
          fig.layout.template.layout.sliderdefaults,
          go.layout.Slider(bgcolor="green"),
      )
  
      self.assertEqual(
          fig.to_dict(),
          {
              "data": [],
              "layout": {
                  "template": {
                      "layout": {"sliderdefaults": {"bgcolor": "green"}}
                  }
              },
          },
      )
  
imports: import copy
  from unittest import TestCase
  import pytest
  import plotly.io
  import plotly.graph_objs
  from plotly.tests.utils import TestCaseNoTemplate
label_desc: Use image node_id 7 for calling the TemplateTest obj's underlying member method code with example usage: obj.test_defaults_in_property_assignment() without return types