code: def info_exists(self, *args):
      return self.root.getboolean(
          self.root.call("info", "exists", *args)
      )
  
imports: import unittest
  from test import support
  import gc
  import tkinter
  from tkinter import Variable, StringVar, IntVar, DoubleVar, BooleanVar, Tcl, TclError
  from test.support import ALWAYS_EQ
  from test.test_tkinter.support import AbstractDefaultRootTest
label_desc: Use image node_id 1 for calling the TestVariable obj's underlying member method code with example usage: obj.info_exists() and returns: self