code: def test_evalfile_null_in_result(self):
      tcl = self.interp
      filename = os_helper.TESTFN_ASCII
      self.addCleanup(os_helper.unlink, filename)
      with open(filename, "w") as f:
          f.write(
              """
              set a "a\0b"
              set b "a\\0b"
              """
          )
      tcl.evalfile(filename)
      self.assertEqual(tcl.eval("set a"), "a\x00b")
      self.assertEqual(tcl.eval("set b"), "a\x00b")
  
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 24 for calling the TclTest obj's underlying member method code with example usage: obj.test_evalfile_null_in_result() without return types