docstr: Test is_listy function
  
  This test assumes the plot output is correct
docstr_tok: ["Test","is_listy","function","This","test","assumes","the","plot","output","is","correct"]
code: def test_is_listy(self):
      """
      Test is_listy function
  
      This test assumes the plot output is correct
      """
  
      # GIVEN is_listy inputs
      test_x = [(0, 1, 2), [1, 2, 3]]
  
      # WHEN plots.is_listy is run
      test_is_listy_output = plots.is_listy(x=test_x)
  
      # THEN validate output is True
      self.assertTrue(test_is_listy_output)
  
file_path: recmetrics/tests/test_plots.py
imports: import unittest
  from unittest import mock
  import numpy
  import pandas
  from recmetrics import plots
label_desc: Use image node_id 11 for calling the TestPlots obj's underlying member method code with example usage: obj.test_is_listy() without return types