code: def test_mutate_args(self, exception):
      @st.cache
      def foo(d):
          d["answer"] += 1
          return d["answer"]
  
      d = {"answer": 0}
  
      self.assertNotEqual(foo(d), foo(d))
  
      exception.assert_not_called()
  
imports: import threading
  import types
  from unittest.mock import Mock, patch
  from parameterized import parameterized
  import streamlit
  from streamlit.elements import exception
  from streamlit.proto.Exception_pb2 import Exception
  from streamlit.runtime.legacy_caching import caching, hashing
  from tests import testutil
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 6 for calling the CacheTest obj's underlying member method code with example usage: obj.test_mutate_args(exception) and returns: d