class_docstr: Credentials Class Unittest class.
docstr: Test Credentials.check_activated() not activated.
code: def test_Credentials_check_activated_false(self):
      """Test Credentials.check_activated() not activated."""
      c = Credentials.get_current()
      c.activation = _Activation("some_email", False)
      with patch("streamlit.runtime.credentials._exit") as p:
          c._check_activated(auto_resolve=False)
          p.assert_called_once_with("Activation email not valid.")
  
imports: import os
  import textwrap
  import unittest
  from pathlib import Path
  from unittest.mock import MagicMock, call, mock_open, patch
  import pytest
  import requests_mock
  from testfixtures import tempdir
  from streamlit import file_util
  from streamlit.runtime.credentials import Credentials, _Activation, _verify_email, email_prompt
label_desc: Use image node_id 12 for calling the CredentialsClassTest obj's underlying member method code with example usage: obj.test_Credentials_check_activated_false() without return types