def test_object_consistency():
empty = Delivery._empty()
filtered = empty._filter_cps()
assert isinstance(filtered.monitor_units, tuple)
filtered._metersets(0, 0)
def test_base_object():
empty = Delivery._empty()
assert empty.monitor_units == tuple()
collection = {field: getattr(empty, field) for field in empty._fields}
dummy = Delivery(**collection)
