self = <swh.storage.tests.test_in_memory.TestInMemoryStorage object at 0x7f3876eda908> swh_storage = <swh.storage.in_memory.InMemoryStorage object at 0x7f384c0639e8> sample_data = <swh.storage.tests.storage_data.StorageData object at 0x7f384f2b9898> def test_snapshot_add_twice(self, swh_storage, sample_data): snapshot, empty_snapshot = sample_data.snapshots[:2] > actual_result = swh_storage.snapshot_add([empty_snapshot]) .tox/py3/lib/python3.7/site-packages/swh/storage/tests/storage_tests.py:2984: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ self = <swh.storage.in_memory.InMemoryStorage object at 0x7f384c0639e8> snapshots = [Snapshot(branches=ImmutableDict({}), id=b'\x1a\x88\x93\xe6\xa8oDN\x8b\xe8\xe7\xbd\xa6\xcb4\xfb\x175\xa0\x0e')] def snapshot_add(self, snapshots: List[Snapshot]) -> Dict: > if not self._allow_overwrite: E AttributeError: 'InMemoryStorage' object has no attribute '_allow_overwrite' .tox/py3/lib/python3.7/site-packages/swh/storage/cassandra/storage.py:668: AttributeError