code: def test_git_repo_invalid(self):
      with patch("git.Repo") as mock:
          mock.side_effect = InvalidGitRepositoryError("Not a git repo")
          repo = GitRepo(".")
          self.assertFalse(repo.is_valid())
  
file_path: streamlit/lib/tests/streamlit/git_util_test.py
imports: import unittest
  from unittest.mock import patch
  from git.exc import InvalidGitRepositoryError
  from streamlit.git_util import GITHUB_HTTP_URL, GITHUB_SSH_URL, GitRepo
label_desc: Use image node_id 3 for calling the GitUtilTest obj's underlying member method code with example usage: obj.test_git_repo_invalid() without return types