code: def test_escape_string(self):
      self.assertEqual(escape_str('"'), '\\"')
      self.assertEqual(escape_str("cat"), "cat")
      self.assertEqual(
          escape_str("my name is 名谦"), "my name is \\u540D\\u8C26"
      )
      self.assertEqual(escape_str('"', backticked=True), '"')
      self.assertEqual(escape_str(chr(200)), "\\u00C8")
      self.assertEqual(escape_str(chr(500)), "\\u01F4")
  
imports: import json
  import unittest
  import hail
  from hail.utils import *
  from hail.utils.misc import escape_str, escape_id
  from hail.utils.java import FatalError
  from hail.utils.linkedlist import LinkedList
  from ..helpers import *
label_desc: Use image node_id 22 for calling the Tests obj's underlying member method code with example usage: obj.test_escape_string() without return types