code: def test_ha_ext(self):
      self.data.ta.ha(append=True)
      self.assertIsInstance(self.data, DataFrame)
      self.assertEqual(
          list(self.data.columns[-4:]),
          ["HA_open", "HA_high", "HA_low", "HA_close"],
      )
  
file_path: pandas-ta/tests/test_ext_indicator_candle.py
imports: from .config import sample_data
  from .context import pandas_ta
  from unittest import TestCase, skip
  from pandas import DataFrame
label_desc: Use image node_id 8 for calling the TestCandleExtension obj's underlying member method code with example usage: obj.test_ha_ext() without return types