code: def test_amat_ext(self):
      self.data.ta.amat(append=True)
      self.assertIsInstance(self.data, DataFrame)
      self.assertEqual(
          list(self.data.columns[-2:]),
          ["AMATe_LR_8_21_2", "AMATe_SR_8_21_2"],
      )
  
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 6 for calling the TestTrendExtension obj's underlying member method code with example usage: obj.test_amat_ext() without return types