code: def test_getboolean(self):
      tcl = self.interp.tk
      self.assertIs(tcl.getboolean("on"), True)
      self.assertIs(tcl.getboolean("1"), True)
      self.assertIs(tcl.getboolean(42), True)
      self.assertIs(tcl.getboolean(0), False)
      self.assertRaises(TypeError, tcl.getboolean)
      self.assertRaises(TypeError, tcl.getboolean, "on", "1")
      self.assertRaises(TypeError, tcl.getboolean, b"on")
      self.assertRaises(TypeError, tcl.getboolean, 1.0)
      self.assertRaises(TclError, tcl.getboolean, "a")
      self.assertRaises(
          (TypeError, ValueError, TclError), tcl.getboolean, "on\0"
      )
      self.assertRaises(
          (UnicodeEncodeError, ValueError, TclError),
          tcl.getboolean,
          "on\ud800",
      )
  
imports: import unittest
  import subprocess
  import sys
  import os
  from test import support
  from test.support import import_helper
  from test.support import os_helper
  import tkinter
  from tkinter import Tcl
  from _tkinter import TclError
label_desc: Use image node_id 22 for calling the TclTest obj's underlying member method code with example usage: obj.test_getboolean() without return types