def test_make_trades_with_equal_stocks(offer_instances):
"""
Ensure that function create right trade instance
Since purchase offer and sell offer have equal quantity of stocks
Function has to create trade instance and delete both offers
"""
purchase_offer = offer_instances[0]
sell_offer = offer_instances[3]
sell_offer.quantity = purchase_offer.quantity
sell_offer.entry_quantity = purchase_offer.entry_quantity
sell_offer.save()
correct_quantity = get_available_quantity_stocks(offer_id=purchase_offer.id)
_make_trades(offer_id=purchase_offer.id)
trade = Trade.objects.get()
assert Trade.objects.count() == 1
assert Offer.objects.get(id=purchase_offer.id).is_active == False
assert Offer.objects.get(id=sell_offer.id).is_active == False
assert trade.seller_offer == sell_offer
assert trade.buyer_offer == purchase_offer
assert trade.quantity == correct_quantity
assert trade.unit_price == sell_offer.price
assert get_available_quantity_stocks(offer_id=sell_offer.id) == 0
assert get_available_quantity_stocks(offer_id=purchase_offer.id) == 0
def _stocks_quantity_for_trade_by_given_offers(
sell_offer_id: int, purchase_offer_id: int
) -> int:
"""Return final stocks quantity for trading"""
sell_stocks = get_available_quantity_stocks(offer_id=sell_offer_id)
purchase_stocks = get_available_quantity_stocks(offer_id=purchase_offer_id)
if purchase_stocks <= sell_stocks:
return purchase_stocks
return sell_stocks
def test_stocks_quantity_for_trade_by_given_offers_with_equal_quantity(offer_instances):
"""
Ensure that function return correct stocks quantity for trade.
Since purchase offer and sell offers have equal quantity of stocks,
Function has to return sell offer and purchase offer quantity of stocks.
"""
purchase_offer = offer_instances[0]
sell_offer = offer_instances[6]
final_quantity = _stocks_quantity_for_trade_by_given_offers(
sell_offer_id=sell_offer.id, purchase_offer_id=purchase_offer.id
)
assert final_quantity == get_available_quantity_stocks(offer_id=sell_offer.id)
assert final_quantity == get_available_quantity_stocks(offer_id=purchase_offer.id)
def _check_offer_quantity(offer_id: int) -> bool:
"""
Checking the offer for emptiness.
If offer has no stocks function returns True.
Otherwise returns False.
"""
quantity = get_available_quantity_stocks(offer_id=offer_id)
return not bool(quantity)
def test_get_available_quantity_stocks(offer_purchase_instance):
"""
Ensure that function return correct quantity of available stocks for now
In purchase offer instance without current quantity
"""
available_stocks = get_available_quantity_stocks(
offer_id=offer_purchase_instance.id)
assert available_stocks == 60
def test_count_current_money_quantity_in_offers(offer_instances):
"""Ensure that function return right quantity of stocks that are used in offers"""
offer = offer_instances[0]
quantity = _count_current_money_quantity_in_offers(user_id=offer.user.id, )
assert quantity == get_full_price(
sell_offer_id=offer.id,
quantity=get_available_quantity_stocks(offer_id=offer.id),
)
def test_get_available_quantity_stocks_with_current_quantity(
offer_sell_instance):
"""
Ensure that function return correct quantity of available stocks for now
In sell offer instance with current quantity
"""
available_stocks = get_available_quantity_stocks(
offer_id=offer_sell_instance.id)
assert available_stocks == 36
def _count_current_quantity_in_offers(user_id: int, item_id: int) -> int:
"""Return number of quantity that user is selling right now"""
quantity_in_offers = 0
for offer in Offer.objects.sell_offers().filter(user_id=user_id,
item_id=item_id):
quantity = get_available_quantity_stocks(offer_id=offer.id)
quantity_in_offers += quantity
return quantity_in_offers
def test_count_current_money_quantity_in_offers_with_smaller_quantity(
offer_purchase_instance, ):
"""Ensure that function return correct boolean value if user has enough quantity of stocks"""
result = check_user_balance(
user_id=offer_purchase_instance.user.id,
quantity=get_available_quantity_stocks(
offer_id=offer_purchase_instance.id),
price=5,
)
assert result == True
def _count_current_money_quantity_in_offers(user_id: int) -> int:
"""Return quantity of money that user use in other offers"""
money_in_offers = 0
for offer in Offer.objects.purchase_offers().filter(user_id=user_id):
quantity = get_full_price(
sell_offer_id=offer.id,
quantity=get_available_quantity_stocks(offer_id=offer.id),
)
money_in_offers += quantity
return money_in_offers
def test_count_current_money_quantity_in_offers_with_greater_quantity(
offer_instances):
"""Ensure that function return correct boolean value if user hasn't enough quantity of stocks"""
offer_purchase_instance = offer_instances[0]
result = check_user_balance(
user_id=offer_purchase_instance.user.id,
quantity=get_available_quantity_stocks(
offer_id=offer_purchase_instance.id),
price=100000,
)
assert result == False
def test_confirm_trade_with_greatest_purchase_stocks_quantity(offer_instances):
"""
Ensure that function create correct trade instance and delete right offer instances
Since purchase offer has more quantity of stocks than sell offer, function has to delete sell offer
"""
purchase_offer = offer_instances[0]
sell_offer = offer_instances[3]
buyer = purchase_offer.user
seller = sell_offer.user
correct_quantity = get_available_quantity_stocks(offer_id=sell_offer.id)
original_buyer_balance = buyer.balance.get().quantity
original_seller_balance = seller.balance.get().quantity
_confirm_trade(sell_offer_id=sell_offer.id, purchase_offer_id=purchase_offer.id)
buyer_balance = buyer.balance.get().quantity
buyer_inventory = buyer.inventory.get(item_id=purchase_offer.item).quantity
seller_balance = seller.balance.get().quantity
seller_inventory = seller.inventory.get(item_id=purchase_offer.item).quantity
trade = Trade.objects.get()
assert Trade.objects.count() == 1
assert Offer.objects.get(id=purchase_offer.id).is_active == True
assert Offer.objects.get(id=sell_offer.id).is_active == False
assert trade.item == purchase_offer.item
assert trade.item == sell_offer.item
assert trade.seller == sell_offer.user
assert trade.buyer == purchase_offer.user
assert trade.quantity == correct_quantity
assert trade.unit_price == sell_offer.price
assert (
trade.description
== f"Trade between {sell_offer.user.username} and {purchase_offer.user.username}"
)
assert trade.seller_offer == sell_offer
assert trade.buyer_offer == purchase_offer
assert buyer_balance == original_buyer_balance - (trade.unit_price * trade.quantity)
assert seller_balance == original_seller_balance + (
trade.unit_price * trade.quantity
)
assert buyer_inventory == 1000 - trade.quantity
assert seller_inventory == 1000 + trade.quantity
def test_stocks_quantity_for_trade_by_given_offers_with_greatest_sell_quantity(
offer_instances,
):
"""
Ensure that function return correct stocks quantity for trade.
Since sell offer has more quantity of stocks than purchase offer.
Function has to return purchase offer quantity of stocks.
"""
purchase_offer_id = offer_instances[0].id
sell_offer_id = offer_instances[5].id
final_quantity = _stocks_quantity_for_trade_by_given_offers(
sell_offer_id=sell_offer_id, purchase_offer_id=purchase_offer_id
)
assert final_quantity == get_available_quantity_stocks(offer_id=purchase_offer_id)
def test_create_trade_with_equal_quantity_stocks(offer_instances):
"""
Ensure that function correctly create Trade instance by the given offers
"""
purchase_offer = offer_instances[0]
sell_offer = offer_instances[6]
buyer = purchase_offer.user
seller = sell_offer.user
original_buyer_balance = buyer.balance.get().quantity
original_seller_balance = seller.balance.get().quantity
correct_quantity = get_available_quantity_stocks(offer_id=sell_offer.id)
_create_trade(sell_offer_id=sell_offer.id, purchase_offer_id=purchase_offer.id)
trade = Trade.objects.get()
buyer_balance = buyer.balance.get().quantity
buyer_inventory = buyer.inventory.get(item_id=purchase_offer.item).quantity
seller_balance = seller.balance.get().quantity
seller_inventory = seller.inventory.get(item_id=purchase_offer.item).quantity
assert trade.item == purchase_offer.item
assert trade.item == sell_offer.item
assert trade.seller == sell_offer.user
assert trade.buyer == purchase_offer.user
assert trade.quantity == correct_quantity
assert trade.unit_price == sell_offer.price
assert (
trade.description
== f"Trade between {sell_offer.user.username} and {purchase_offer.user.username}"
)
assert trade.seller_offer == sell_offer
assert trade.buyer_offer == purchase_offer
assert buyer_balance == original_buyer_balance - (trade.unit_price * trade.quantity)
assert seller_balance == original_seller_balance + (
trade.unit_price * trade.quantity
)
assert buyer_inventory == 1000 - trade.quantity
assert seller_inventory == 1000 + trade.quantity
def test_make_trades_with_greatest_purchase_stocks(offer_instances):
"""
Ensure that function create right trade instances
Since purchase offer has more quantity of stocks than one sell offer
Function has to create 2 trade instances with different sell offer instances
And delete purchase offer and first sell offer
"""
purchase_offer = offer_instances[0]
sell_offer_1 = offer_instances[3]
sell_offer_2 = offer_instances[5]
current_purchase_quantity = get_available_quantity_stocks(
offer_id=purchase_offer.id
)
current_sell_quantity_1 = get_available_quantity_stocks(offer_id=sell_offer_1.id)
current_sell_quantity_2 = get_available_quantity_stocks(offer_id=sell_offer_2.id)
correct_quantity_1 = current_sell_quantity_1
correct_quantity_2 = current_purchase_quantity - correct_quantity_1
_make_trades(offer_id=purchase_offer.id)
trade_1 = Trade.objects.first()
trade_2 = Trade.objects.last()
assert Trade.objects.count() == 2
assert Offer.objects.get(id=purchase_offer.id).is_active == False
assert Offer.objects.get(id=sell_offer_1.id).is_active == False
assert Offer.objects.get(id=sell_offer_2.id).is_active == True
assert trade_1.seller_offer == sell_offer_1
assert trade_1.buyer_offer == purchase_offer
assert trade_1.quantity == correct_quantity_1
assert trade_1.unit_price == sell_offer_1.price
assert get_available_quantity_stocks(offer_id=sell_offer_1.id) == 0
assert trade_2.seller_offer == sell_offer_2
assert trade_2.buyer_offer == purchase_offer
assert trade_2.quantity == correct_quantity_2
assert trade_2.unit_price == sell_offer_2.price
assert (
get_available_quantity_stocks(offer_id=sell_offer_2.id)
== current_sell_quantity_2 - trade_2.quantity
)
assert get_available_quantity_stocks(offer_id=purchase_offer.id) == 0