code: def test_merge_1(self):
      self.assertEqual(
          pio.templates.merge_templates(self.template1), self.template1
      )
  
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 3 for calling the TestMergeTemplates obj's underlying member method code with example usage: obj.test_merge_1() without return types