code: def test_merge_2(self):
      result = pio.templates.merge_templates(
          self.template1, self.template2
      )
      expected = self.expected1_2
  
      self.assertEqual(result, expected)
  
      # Make sure input templates weren't modified
      self.assertEqual(self.template1, self.template1_orig)
      self.assertEqual(self.template2, self.template2_orig)
  
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 4 for calling the TestMergeTemplates obj's underlying member method code with example usage: obj.test_merge_2() without return types