code: def test_variable(self):
      self.assertRaises(RuntimeError, Variable)
      root = tkinter.Tk()
      v = Variable()
      v.set("value")
      self.assertEqual(v.get(), "value")
      root.destroy()
      tkinter.NoDefaultRoot()
      self.assertRaises(RuntimeError, Variable)
  
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 DefaultRootTest obj's underlying member method code with example usage: obj.test_variable() without return types