self = <swh.storage.tests.test_cassandra.TestCassandraStorage object at 0x7fb57c117630> swh_storage = <swh.storage.cassandra.storage.CassandraStorage object at 0x7fb57c039b70> sample_data = <swh.storage.tests.storage_data.StorageData object at 0x7fb57c1bd470> def test_revision_add_twice(self, swh_storage, sample_data): revision, revision2 = sample_data.revisions[:2] > actual_result = swh_storage.revision_add([revision]) .tox/py3/lib/python3.7/site-packages/swh/storage/tests/storage_tests.py:947: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .tox/py3/lib/python3.7/site-packages/swh/storage/cassandra/storage.py:484: in revision_add revisions = list(set(revisions)) <attrs generated hash swh.model.model.Revision>:15: in __hash__ self.extra_headers, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ self = ImmutableDict({'checksums': {'sha1': 'tarball-sha1', 'sha256': 'tarball-sha256'}, 'signed-off-by': 'some-dude'}) def __hash__(self): > return hash(tuple(sorted(self.data))) E TypeError: unhashable type: 'dict' .tox/py3/lib/python3.7/site-packages/swh/model/collections.py:49: TypeError