def test_config_filename(config_type):
data_path = Path(get_test_data_path())
# Use custom config that replaces session with oligarchy
config_path = data_path.parent / 'bids_specs_with_oligarchy.json'
layout = BIDSLayout(data_path / "7t_trt", config=config_type(config_path))
# Validate that we are using the desired configuration
assert 'oligarchy' in layout.get_entities()
