code: def test_nested_update_dots(self):
      assert self.scatter["marker.colorbar.title.font.family"] is None
      self.scatter.update(
          {"marker.colorbar.title.font.family": "courier"}
      )
  
      assert (
          self.scatter["marker.colorbar.title.font.family"] == "courier"
      )
      d1, d2 = strip_dict_params(self.scatter, self.expected_nested)
      assert d1 == d2
  
imports: from unittest import TestCase
  import plotly.graph_objs
  from plotly.tests.utils import strip_dict_params
label_desc: Use image node_id 9 for calling the TestAssignmentPrimitive obj's underlying member method code with example usage: obj.test_nested_update_dots() without return types