class_docstr: Credentials Class Unittest class.
docstr: Test Credentials constructor.
code: def test_Credentials_constructor(self):
      """Test Credentials constructor."""
      c = Credentials()
  
      self.assertEqual(c._conf_file, MOCK_PATH)
      self.assertEqual(c.activation, None)
  
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 3 for calling the CredentialsClassTest obj's underlying member method code with example usage: obj.test_Credentials_constructor() without return types