code: def test_last_commit(self, git_repo_fn):
      git_repo = git_repo_fn(commit_msg="My commit message")
      assert len(git_repo.last_commit) == 40
  
file_path: wandb/tests/pytest_tests/unit_tests/test_lib/test_git.py
imports: from typing import Generator, Optional
  import git
  import pytest
  from wandb.sdk.lib.gitlib import GitRepo
label_desc: Use image node_id 1 for calling the TestGitRepo obj's underlying member method code with example usage: obj.test_last_commit(git_repo_fn) without return types