class_docstr: Test UserInfoProxy.
class_docstr_tok: ["Test","UserInfoProxy","."]
code: def test_user_email_key(self):
      self.assertEqual(st.experimental_user["email"], "test@test.com")
  
file_path: streamlit/lib/tests/streamlit/user_info_test.py
imports: import threading
  import streamlit
  from streamlit.errors import StreamlitAPIException
  from streamlit.runtime.forward_msg_queue import ForwardMsgQueue
  from streamlit.runtime.scriptrunner import ScriptRunContext, add_script_run_ctx, get_script_run_ctx
  from streamlit.runtime.state import SafeSessionState, SessionState
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 2 for calling the UserInfoProxyTest obj's underlying member method code with example usage: obj.test_user_email_key() without return types