code: def test_ppo_ext(self):
      self.data.ta.ppo(append=True)
      self.assertIsInstance(self.data, DataFrame)
      self.assertEqual(
          list(self.data.columns[-3:]),
          ["PPO_12_26_9", "PPOh_12_26_9", "PPOs_12_26_9"],
      )
  
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 27 for calling the TestMomentumExtension obj's underlying member method code with example usage: obj.test_ppo_ext() without return types