code: def test_null_in_name(self):
      with self.assertRaises(ValueError):
          Variable(self.root, name="var\x00name")
      with self.assertRaises(ValueError):
          self.root.globalsetvar("var\x00name", "value")
      with self.assertRaises(ValueError):
          self.root.globalsetvar(b"var\x00name", "value")
      with self.assertRaises(ValueError):
          self.root.setvar("var\x00name", "value")
      with self.assertRaises(ValueError):
          self.root.setvar(b"var\x00name", "value")
  
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 8 for calling the TestVariable obj's underlying member method code with example usage: obj.test_null_in_name() without return types