swh_storage = <swh.storage.in_memory.InMemoryStorage object at 0x7f5a780d1710> sample_data = <swh.storage.tests.storage_data.StorageData object at 0x7f5b2e64afd0> def test_snapshot_get_latest_none(swh_storage, sample_data): """Retrieve latest snapshot on unknown origin or origin without snapshot should yield no result """ # unknown origin so None assert snapshot_get_latest(swh_storage, "unknown-origin") is None # no snapshot on origin visit so None > origin = sample_data["origin"][0] E TypeError: 'StorageData' object is not subscriptable .tox/py3/lib/python3.7/site-packages/swh/storage/tests/algos/test_snapshot.py:56: TypeError