code: def test_key(self, key):
      zi = self.klass(key)
  
      self.assertEqual(zi.key, key)
  
imports: import contextlib
  import datetime
  import os
  import pickle
  import unittest
  import zoneinfo
  from test.support.hypothesis_helper import hypothesis
  import test.test_zoneinfo._support
label_desc: Use image node_id 2 for calling the ZoneInfoTest obj's underlying member method code with example usage: obj.test_key(key) without return types