code: def test_GitRepo_instance_from_not_existing(path=None, path2=None):
      # 1. create=False and path doesn't exist:
      repo = GitRepo(path)
      assert_false(op.exists(path))
  
      # 2. create=False, path exists, but no git repo:
      os.mkdir(path)
      ok_(op.exists(path))
      repo = GitRepo(path)
      assert_false(op.exists(op.join(path, ".git")))
  
      # 3. create=True, path doesn't exist:
      gr = GitRepo(path2).init()
      assert_is_instance(gr, GitRepo, "GitRepo was not created.")
      ok_(op.exists(op.join(path2, ".git")))
      # re-enable from core GitRepo has a status() method
      # assert_repo_status(path2, annex=False)
  
      # 4. create=True, path exists, but no git repo:
      gr = GitRepo(path).init()
      assert_is_instance(gr, GitRepo, "GitRepo was not created.")
      ok_(op.exists(op.join(path, ".git")))
  
imports: import logging
  import os
  import os.path
  import sys
  from datalad.dataset.gitrepo import GitRepo, _get_dot_git
  from datalad.support.exceptions import CommandError, PathKnownToRepositoryError
  from datalad.tests.utils_pytest import SkipTest, assert_cwd_unchanged, assert_equal, assert_false, assert_in, assert_is_instance, assert_not_in, assert_raises, eq_, neq_, ok_, swallow_logs, with_tempfile, with_tree
  from datalad.utils import Path, chpwd
label_desc: Use image node_id 3 for calling a global function with example usage: test_GitRepo_instance_from_not_existing(path, path2) without return types