test_state_table_generators.py 文件源码

def test_empty_dense_state_table():
    """An empty dense (input) state table produces a useful error."""
    with testing.postgresql.Postgresql() as postgresql:
        engine = create_engine(postgresql.url())
        utils.create_dense_state_table(engine, 'states', ())  # no data
        table_generator = StateTableGenerator(
            engine,
            'exp_hash',
            dense_state_table='states'
        )

        with pytest.raises(ValueError):
            table_generator.generate_sparse_table([datetime(2016, 1, 1)])

        engine.dispose()