class_docstr: https://school.stockcharts.com/doku.php?id=technical_indicators:moving_average_convergence_divergence_macd
class_docstr_tok: ["https",":","\/\/school.stockcharts.com\/doku.php","?","id=technical_indicators",":","moving_average_convergence_divergence_macd"]
code: def tearDownClass(cls):
      del cls._df
  
imports: import unittest
  import pandas
  from ta.trend import MACD, ADXIndicator, CCIIndicator, PSARIndicator, STCIndicator, VortexIndicator, WMAIndicator, adx, adx_neg, adx_pos, cci, macd, macd_diff, macd_signal, psar_down, psar_down_indicator, psar_up, psar_up_indicator, stc, vortex_indicator_neg, vortex_indicator_pos, wma_indicator
label_desc: Use image node_id 2 for calling the TestMACDIndicator obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types