self = <swh.storage.tests.test_tenacious.TestTenaciousStorage object at 0x7f001b14a1d0> swh_storage = <swh.storage.proxies.tenacious.TenaciousProxyStorage object at 0x7f0017e4ab00> sample_data = <swh.storage.tests.storage_data.StorageData object at 0x7f0011be2da0> def test_content_get_random(self, swh_storage, sample_data): cont, cont2, cont3 = sample_data.contents[:3] swh_storage.content_add([cont, cont2, cont3]) > assert swh_storage.content_get_random() in { cont.sha1_git, cont2.sha1_git, cont3.sha1_git, } .tox/py3/lib/python3.7/site-packages/swh/storage/tests/storage_tests.py:685: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .tox/py3/lib/python3.7/site-packages/swh/storage/metrics.py:24: in d return f(*a, **kw) .tox/py3/lib/python3.7/site-packages/swh/storage/cassandra/storage.py:430: in content_get_random content = self._cql_runner.content_get_random() .tox/py3/lib/python3.7/site-packages/swh/storage/in_memory.py:205: in content_get_random return self._contents.get_random() .tox/py3/lib/python3.7/site-packages/swh/storage/in_memory.py:150: in get_random return random.choice([row for (pk, row) in self.iter_all()]) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ self = <random.Random object at 0x1e6e9d8>, seq = [] def choice(self, seq): """Choose a random element from a non-empty sequence.""" try: i = self._randbelow(len(seq)) except ValueError: > raise IndexError('Cannot choose from an empty sequence') from None E IndexError: Cannot choose from an empty sequence /usr/lib/python3.7/random.py:261: IndexError