def test_prefers_current_stock_batches_to_shipments():
in_stock_batch = Batch("in-stock-batch", "RETRO-CLOCK", 100, eta=None)
shipment_batch = Batch("shipment-batch", "RETRO-CLOCK", 100, eta=tomorrow)
line = OrderLine("oref", "RETRO-CLOCK", 10)
allocate(line, [in_stock_batch, shipment_batch])
assert in_stock_batch.available_quantity == 90
assert shipment_batch.available_quantity == 100
def test_prefers_earlier_batches():
earliest = Batch("speedy-batch", "MINIMALIST-SPOON", 100, eta=today)
medium = Batch("normal-batch", "MINIMALIST-SPOON", 100, eta=tomorrow)
latest = Batch("slow-batch", "MINIMALIST-SPOON", 100, eta=later)
line = OrderLine("order1", "MINIMALIST-SPOON", 10)
allocate(line, [medium, earliest, latest])
assert earliest.available_quantity == 90
assert medium.available_quantity == 100
assert latest.available_quantity == 100
def test_prefers_warehouse_batches_to_shipments():
batch_in_warehouse = Batch("batch-001", "DESK-LAMP", 100, None)
batch_tomorrow = Batch("batch-002", "DESK-LAMP", 100, tomorrow)
line = OrderLine("oref", "DESK-LAMP", 10)
batches = [batch_in_warehouse, batch_tomorrow]
selected_batch_ref = allocate(line, batches)
assert selected_batch_ref == batch_in_warehouse.reference and batch_in_warehouse.available_quantity == 90
def test_returns_allocated_ref():
in_stock_batch = Batch("in-stock-batch", "RETRO-CLOCK", 100, eta=None)
shipment_batch = Batch("shipment-batch", "RETRO-CLOCK", 100, eta=tomrrow)
line = OrderLine("oref", "RETRO-CLOCK", 10)
allocations = allocate(line, [in_stock_batch, shipment_batch])
assert allocations == in_stock_batch.reference
def allocate(orderid: str, sku: str, qty: int,
uow: unit_of_work.AbstractUnitOfWork) -> str:
line = model.OrderLine(orderid, sku, qty)
with uow:
batches = uow.batches.list()
if not is_valid_sku(sku, batches):
raise InvalidSku(f"Invalid sku {sku}")
batchref = model.allocate(line, batches)
uow.commit()
return batchref
def test_returns_allocated_batch_ref():
in_stock_batch = Batch("in-stock-batch-ref",
"HIGHBROW-POSTER",
100,
eta=None)
shipment_batch = Batch("shipment-batch-ref",
"HIGHBROW-POSTER",
100,
eta=tomorrow)
line = OrderLine("oref", "HIGHBROW-POSTER", 10)
allocation = allocate(line, [in_stock_batch, shipment_batch])
assert allocation == in_stock_batch.reference
def test_raises_out_of_stock_exception_if_cannot_allocate():
batch = Batch('batch1', 'SMALL-FORK', 10, eta=today)
allocate(OrderLine('order1', 'SMALL-FORK', 10), [batch])
with pytest.raises(OutOfStock, match='SMALL-FORK'):
allocate(OrderLine('order2', 'SMALL-FORK', 1), [batch])
def test_raises_out_of_stock_exception_if_cannot_allocate():
batch = Batch("batch1", "SMALL-FORK", 10, eta=today)
allocate(OrderLine("order1", "SMALL-FORK", 10), [batch])
with pytest.raises(OutOfStock, match="SMALL-FORK"):
allocate(OrderLine("order2", "SMALL-FORK", 1), [batch])
