feat(order): Add finalize order functionality

test/test_shop.py

@@ -0,0 +1,71 @@
+from decimal import Decimal
+
+from fake_data import fake
+from starlette.testclient import TestClient
+
+from allmende_payment_system.database import ensure_user
+from allmende_payment_system.models import (
+    Account,
+    Area,
+    Order,
+    OrderItem,
+    Product,
+    Transaction,
+)
+
+
+def create_user_with_account(test_db, username: str, balance: float | None = None):
+    user_info = {"username": username, "display_name": f"Display {username}"}
+    user = ensure_user(user_info, test_db)
+    account = Account(name=f"Account for {username}")
+    test_db.add(account)
+    user.accounts.append(account)
+
+    if balance is not None:
+        user.accounts[0].transactions.append(
+            Transaction(total_amount=Decimal(balance), type="deposit")
+        )
+    test_db.flush()
+    return user
+
+
+def test_add_item_to_cart(client: TestClient, test_db):
+    area = Area(**fake.area())
+    test_db.add(area)
+    product = Product(**fake.product())
+    product.area = area
+    test_db.add(product)
+    test_db.flush()
+    form_data = {"product_id": product.id, "quantity": 2, "area_id": area.id}
+
+    response = client.post(
+        "/shop/cart/add",
+        data=form_data,
+        headers={"Content-Type": "application/x-www-form-urlencoded"},
+        follow_redirects=False,
+    )
+    assert response.status_code == 302
+
+
+def test_finalize_order(client: TestClient, test_db):
+    area = Area(**fake.area())
+    test_db.add(area)
+    product = Product(**fake.product())
+    product.area = area
+    test_db.add(product)
+    test_db.flush()
+
+    user = create_user_with_account(test_db, "test", balance=100.0)
+
+    user.shopping_cart.items.append(
+        OrderItem(product=product, quantity=2, total_amount=product.price * 2)
+    )
+    test_db.flush()
+
+    response = client.get("/shop/finalize_order", follow_redirects=False)
+    assert response.status_code == 302
+
+    assert len(user.shopping_cart.items) == 0
+    assert len(user.orders) == 2  # shopping cart + finalized order
+
+    assert user.accounts[0].balance == Decimal(100.0) - (product.price * 2)