code: def test_linreg_slope(self):
      result = pandas_ta.linreg(self.close, slope=True, talib=False)
      self.assertIsInstance(result, Series)
      self.assertEqual(result.name, "LRm_14")
  
      try:
          expected = tal.LINEARREG_SLOPE(self.close)
          pdt.assert_series_equal(result, expected, check_names=False)
      except AssertionError:
          try:
              corr = pandas_ta.utils.df_error_analysis(
                  result, expected, col=CORRELATION
              )
              self.assertGreater(corr, CORRELATION_THRESHOLD)
          except Exception as ex:
              error_analysis(result, CORRELATION, ex)
  
      result = pandas_ta.linreg(self.close, slope=True)
      self.assertIsInstance(result, Series)
      self.assertEqual(result.name, "LRm_14")
  
imports: from .config import CORRELATION, CORRELATION_THRESHOLD, error_analysis, sample_data, VERBOSE
  from .context import pandas_ta
  from unittest import TestCase
  import pandas.testing
  from pandas import DataFrame, Series
  import talib
label_desc: Use image node_id 21 for calling the TestOverlap obj's underlying member method code with example usage: obj.test_linreg_slope() without return types