code: def test_tos_stdevall_ext(self):
      self.data.ta.tos_stdevall(append=True)
      self.assertIsInstance(self.data, DataFrame)
      self.assertEqual(
          list(self.data.columns[-7:]),
          [
              "TOS_STDEVALL_LR",
              "TOS_STDEVALL_L_1",
              "TOS_STDEVALL_U_1",
              "TOS_STDEVALL_L_2",
              "TOS_STDEVALL_U_2",
              "TOS_STDEVALL_L_3",
              "TOS_STDEVALL_U_3",
          ],
      )
  
file_path: pandas-ta/tests/test_ext_indicator_statistics.py
imports: from .config import sample_data
  from .context import pandas_ta
  from unittest import skip, TestCase
  from pandas import DataFrame
label_desc: Use image node_id 12 for calling the TestStatisticsExtension obj's underlying member method code with example usage: obj.test_tos_stdevall_ext() without return types