code: def test_flaglist_string_getitem(self):
      result = pio.templates["template1+template2"]
      expected = self.expected1_2
      self.assertEqual(result, expected)
  
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 7 for calling the TestMergeTemplates obj's underlying member method code with example usage: obj.test_flaglist_string_getitem() without return types