code: def test_template_in(self):
      self.assertTrue("test_template" in pio.templates)
      self.assertFalse("bogus" in pio.templates)
      self.assertFalse(42 in pio.templates)
  
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 18 for calling the TemplateTest obj's underlying member method code with example usage: obj.test_template_in() without return types