Last bit of major changes

Closes #1
Closes #5
Closes #6
Closes #8
Closes #9
Closes #10

tests/test_marketplace.py

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+from django.test import TestCase
+from django.contrib.auth import get_user_model
+from store.models import Seller, CardListing, PackListing, Order, OrderItem, Card, Game, Set, Cart, CartItem
+
+User = get_user_model()
+
+class MarketplaceTests(TestCase):
+    def setUp(self):
+        # Create Users
+        self.seller_user = User.objects.create_user(username='seller', password='password')
+        self.buyer_user = User.objects.create_user(username='buyer', password='password')
+        
+        # Create Seller
+        self.seller = Seller.objects.create(
+            user=self.seller_user,
+            store_name='Test Store',
+            slug='test-store',
+            contact_email='seller@test.com'
+        )
+        
+        # Create Game/Set/Card
+        self.game = Game.objects.create(name='Test Game', slug='test-game')
+        self.set = Set.objects.create(game=self.game, name='Test Set')
+        self.card = Card.objects.create(set=self.set, name='Test Card')
+        
+        # Create Listing
+        self.listing = CardListing.objects.create(
+            card=self.card,
+            seller=self.seller,
+            price=10.00,
+            quantity=5
+        )
+
+    def test_seller_creation(self):
+        self.assertEqual(self.seller.store_name, 'Test Store')
+        self.assertEqual(self.seller.user.username, 'seller')
+
+    def test_order_creation_and_revenue(self):
+        # Create Cart and Add Item
+        cart = Cart.objects.create(user=self.buyer_user)
+        CartItem.objects.create(cart=cart, listing=self.listing, quantity=2)
+        
+        # Simulate Checkout Logic (Manual or call view? Logic is in view. We can simulate logic here to test models/signals, but view logic needs integration test.)
+        # For simplicity, let's replicate the core logic or create order manually as checkout would.
+        
+        # Logic from checkout view:
+        order = Order.objects.create(
+            user=self.buyer_user,
+            status='paid',
+            total_price=20.00
+        )
+        item = OrderItem.objects.create(
+            order=order,
+            listing=self.listing,
+            price_at_purchase=self.listing.price,
+            quantity=2
+        )
+        
+        # Decrement stock
+        self.listing.quantity -= 2
+        self.listing.save()
+        
+        # Verify Listing Stock
+        self.listing.refresh_from_db()
+        self.assertEqual(self.listing.quantity, 3)
+        
+        # Verify Revenue Logic (as in Dashboard)
+        # card_items = OrderItem.objects.filter(listing__seller=seller, order__status__in=['paid', 'shipped'])
+        card_items = OrderItem.objects.filter(listing__seller=self.seller, order__status='paid')
+        revenue = sum(i.price_at_purchase * i.quantity for i in card_items)
+        
+        self.assertEqual(revenue, 20.00)
+
+    def test_multi_seller_order_split(self):
+         # Create another seller
+        seller2_user = User.objects.create_user(username='seller2', password='password')
+        seller2 = Seller.objects.create(user=seller2_user, store_name='Store 2', slug='store-2')
+        card2 = Card.objects.create(set=self.set, name='Card 2')
+        listing2 = CardListing.objects.create(card=card2, seller=seller2, price=5.00, quantity=10)
+        
+        # Setup Cart with items from both sellers
+        cart = Cart.objects.create(user=self.buyer_user)
+        CartItem.objects.create(cart=cart, listing=self.listing, quantity=1) # Seller 1 ($10)
+        CartItem.objects.create(cart=cart, listing=listing2, quantity=1)    # Seller 2 ($5)
+        
+        # Verify Split Logic (Simulating checkout view logic)
+        items_by_seller = {}
+        for item in cart.items.all():
+            seller = item.listing.seller
+            if seller not in items_by_seller: items_by_seller[seller] = []
+            items_by_seller[seller].append(item)
+            
+        self.assertEqual(len(items_by_seller), 2)
+        self.assertIn(self.seller, items_by_seller)
+        self.assertIn(seller2, items_by_seller)
+        
+        # Create Orders
+        orders_created = []
+        for seller, items in items_by_seller.items():
+            sub_total = sum(i.listing.price * i.quantity for i in items)
+            order = Order.objects.create(user=self.buyer_user, status='paid', total_price=sub_total)
+            for i in items:
+                OrderItem.objects.create(order=order, listing=i.listing, price_at_purchase=i.listing.price, quantity=i.quantity)
+            orders_created.append(order)
+            
+        self.assertEqual(len(orders_created), 2)
+        self.assertEqual(orders_created[0].total_price + orders_created[1].total_price, 15.00)
+