def test_handler_existing_file():
handler = FakeHandler([])
file_info = os.stat(__file__)
with handler.parent_open(__file__) as f_obj:
assert (os.fstat(f_obj.fileno()).st_ino ==
file_info.st_ino)
assert f_obj.name == __file__
def test_handler_missing_file():
handler = FakeHandler([])
assert handler.parent_open("does_not_exist") is None