def test_allocating_to_a_batch_reduces_the_available_quantity():
batch = Batch("batch-001", "SMALL-TABLE", qty=20, eta=date.today())
line = OrderLine("order-ref", "SMALL-TABLE", 2)
batch.allocate(line)
assert batch.available_quantity == 18
def allocate(orderid: str, sku: str, qty: int, repo: AbstractRepository,
session) -> str:
line = OrderLine(orderid, sku, qty)
batches = repo.list()
if not is_valid_sku(line.sku, batches):
raise InvalidSku(f"Invalid sku {line.sku}")
batchref = model.allocate(line, batches)
session.commit()
return batchref
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_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_cannot_allocate_if_skus_do_not_match():
batch = Batch("batch-001", "UNCOMFORTABLE-CHAIR", 100, eta=None)
different_sku_line = OrderLine("order-123", "EXPENSIVE-TOASTER", 10)
assert batch.can_allocate(different_sku_line) is False
def make_batch_and_line(sku, batch_qty, line_qty):
return (
Batch("batch-001", sku, batch_qty, eta=date.today()),
OrderLine("order-123", sku, line_qty),
)
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])