def METHOD_NAME(self, model):
    assert model.fs.unit.config.database is model.db
    assert model.fs.unit._tech_type == "storage_tank"
    assert isinstance(model.fs.unit.storage_time, Var)
    assert isinstance(model.fs.unit.surge_capacity, Var)
    assert isinstance(model.fs.unit.tank_volume, Var)
    assert isinstance(model.fs.unit.tank_volume_constraint, Constraint)