code: def testEncodeDecodeKey(self):
      test_cases = [
          "a",
          "simple",
          "dollar$",
          "$dollar",
          "$do$ll$ar$",
          ("a"),
          ("a", "simple"),
          ("dollar$", "simple"),
          ("do$llar", "sim$ple", "str$"),
          ("many", "many", "elements", "in", "the", "tuple"),
          "unicode\u1234",
          "uni\u1234code\u2345",
          ("mixed", "uni\u1234", "\u2345\u1234"),
          ("\u1234\u2345", "\u3456\u2345"),
      ]
      for key in test_cases:
          self.assertEqual(
              key, encoding.decode_key(encoding.encode_key(key))
          )
  
imports: import tensorflow
  from tensorflow_model_analysis.eval_saved_model import encoding
label_desc: Use image node_id 2 for calling the EncodingTest obj's underlying member method code with example usage: obj.testEncodeDecodeKey() without return types