code: def test_disabled(self):
      assert to_git_info(GitRef.DISABLED) is None
  
imports: import datetime
  import git
  from git import Repo
  from mock import MagicMock, patch
  from neptune.internal.utils.git import GitInfo, get_diff, get_relevant_upstream_commit, get_repo_from_git_ref, get_uncommitted_changes, get_upstream_index_sha, search_for_most_recent_ancestor, to_git_info, track_uncommitted_changes
  from neptune.types import GitRef
label_desc: Use image node_id 1 for calling the TestGit obj's underlying member method code with example usage: obj.test_disabled() without return types