code: def test_ascii(self):
      hasher = hashing.Hasher(salt="")
      res = hasher.hash_key("foo")
      self.assertEqual(res, 229609063533823256041787889330700985560)
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import hashing
label_desc: Use image node_id 2 for calling the HashingTest obj's underlying member method code with example usage: obj.test_ascii() without return types