code: def setUp(self):
      pio.templates["test_template"] = {
          "layout": {"font": {"family": "Rockwell"}}
      }
      pio.templates.default = None
  
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 1 for calling the TemplateTest obj's underlying member method code with example usage: obj.setUp() without return types