code: def test_symbol_lookup(self):
      self.assertEqual(
          len(self.top.get_identifiers()), len(self.top.get_symbols())
      )
  
      self.assertRaises(KeyError, self.top.lookup, "not_here")
  
imports: import symtable
  import unittest
  from test import support
  from test.support import os_helper
label_desc: Use image node_id 14 for calling the SymtableTest obj's underlying member method code with example usage: obj.test_symbol_lookup() without return types