where the transformers sub-dir resides)

stringified paths---same as above but these return paths as strings, rather than pathlib objects:

test_file_path_str

test_file_dir_str
tests_dir_str
examples_dir_str
repo_root_dir_str
src_dir_str

To start using those all you need is to make sure that the test resides in a subclass of
transformers.test_utils.TestCasePlus.