class_docstr: https://school.stockcharts.com/doku.php?id=technical_indicators:force_index
class_docstr_tok: ["https",":","\/\/school.stockcharts.com\/doku.php","?","id=technical_indicators",":","force_index"]
code: def test_fi(self):
      target = "FI"
      result = force_index(**self._params)
      pd.testing.assert_series_equal(
          self._df[target].tail(), result.tail(), check_names=False
      )
  
imports: import unittest
  import pandas
  from ta.volume import AccDistIndexIndicator, EaseOfMovementIndicator, ForceIndexIndicator, MFIIndicator, OnBalanceVolumeIndicator, VolumePriceTrendIndicator, VolumeWeightedAveragePrice, acc_dist_index, ease_of_movement, force_index, money_flow_index, on_balance_volume, sma_ease_of_movement, volume_price_trend, volume_weighted_average_price
label_desc: Use image node_id 3 for calling the TestForceIndexIndicator obj's underlying member method code with example usage: obj.test_fi() without return types