WIP

tests/test_product.py

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+from datetime import datetime
+
+import pytest
+from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import Session
+
+from dibbler.models import Product, Transaction, TransactionType, User
+
+
+def insert_test_data(sql_session: Session) -> None:
+    # Add users
+    user1 = User("Test User 1")
+    user2 = User("Test User 2")
+
+    sql_session.add_all([user1, user2])
+    sql_session.commit()
+
+    # Add products
+    product1 = Product("1234567890123", "Test Product 1")
+    product2 = Product("9876543210987", "Test Product 2")
+    product3 = Product("1111111111111", "Test Product 3")
+    sql_session.add_all([product1, product2, product3])
+    sql_session.commit()
+
+    # Add transactions
+    transactions = [
+        Transaction(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            type_=TransactionType.ADJUST_BALANCE,
+            amount=100,
+            user_id=user1.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 10, 0, 1),
+            type_=TransactionType.ADJUST_BALANCE,
+            amount=50,
+            user_id=user2.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 10, 0, 2),
+            type_=TransactionType.ADJUST_BALANCE,
+            amount=-50,
+            user_id=user1.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            type_=TransactionType.ADD_PRODUCT,
+            amount=27 * 2,
+            per_product=27,
+            product_count=2,
+            user_id=user1.id,
+            product_id=product1.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 12, 0, 1),
+            type_=TransactionType.BUY_PRODUCT,
+            amount=27,
+            product_count=1,
+            user_id=user2.id,
+            product_id=product1.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 12, 0, 2),
+            type_=TransactionType.ADD_PRODUCT,
+            amount=50,
+            per_product=50,
+            product_count=1,
+            user_id=user1.id,
+            product_id=product3.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 12, 0, 3),
+            type_=TransactionType.BUY_PRODUCT,
+            amount=50,
+            product_count=1,
+            user_id=user1.id,
+            product_id=product3.id,
+        ),
+        Transaction(
+            time=datetime(2023, 10, 1, 12, 0, 4),
+            type_=TransactionType.ADJUST_BALANCE,
+            amount=1000,
+            user_id=user1.id,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    # Note: These constructors depend on the content of the previous transactions,
+    #       so they cannot be part of the initial transaction list.
+
+    transaction = Transaction.adjust_stock_auto_amount(
+        sql_session=sql_session,
+        time=datetime(2023, 10, 1, 13, 0, 0),
+        product_count=3,
+        user_id=user1.id,
+        product_id=product1.id,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()
+
+    transaction = Transaction.adjust_stock_auto_amount(
+        sql_session=sql_session,
+        time=datetime(2023, 10, 1, 13, 0, 1),
+        product_count=-2,
+        user_id=user1.id,
+        product_id=product1.id,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()
+
+
+def test_no_duplicate_products(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product1 = Product("1234567890123", "Test Product 1")
+    sql_session.add(product1)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()
+
+
+def test_product_stock(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product1 = sql_session.scalars(select(Product).where(Product.name == "Test Product 1")).one()
+    product2 = sql_session.scalars(select(Product).where(Product.name == "Test Product 2")).one()
+
+    assert product1.stock(sql_session) == 2 - 1 + 3 - 2
+    assert product2.stock(sql_session) == 0
+
+def test_product_price(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product1 = sql_session.scalars(select(Product).where(Product.name == "Test Product 1")).one()
+    assert product1.price(sql_session) == 27
+
+
+def test_product_no_transactions_price(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product2 = sql_session.scalars(select(Product).where(Product.name == "Test Product 2")).one()
+    assert product2.price(sql_session) == 0
+
+
+def test_product_sold_out_price(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product3 = sql_session.scalars(select(Product).where(Product.name == "Test Product 3")).one()
+    assert product3.price(sql_session) == 50
+
+def test_allowed_to_buy_more_than_stock(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product1 = sql_session.scalars(select(Product).where(Product.name == "Test Product 1")).one()
+    user1 = sql_session.scalars(select(User).where(User.name == "Test User 1")).one()
+
+    transaction = Transaction.buy_product(
+        time=datetime(2023, 10, 1, 12, 0, 6),
+        amount = 27 * 5,
+        product_count=10,
+        user_id=user1.id,
+        product_id=product1.id,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()
+
+    product1_stock = product1.stock(sql_session)
+    assert product1_stock < 0  # Should be negative, as we bought more than available stock
+
+    product1_price = product1.price(sql_session)
+    assert product1_price == 27  # Price should remain the same, as it is based on previous transactions
+
+    transaction = Transaction.add_product(
+        time=datetime(2023, 10, 1, 12, 0, 8),
+        amount=22,
+        per_product=22,
+        product_count=1,
+        user_id=user1.id,
+        product_id=product1.id,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()
+
+    product1_price = product1.price(sql_session)
+    assert product1_price == 22  # Price should now be updated to the new price of the added product
+
+
+def test_not_allowed_to_buy_with_incorrect_amount(sql_session: Session):
+    insert_test_data(sql_session)
+
+    product1 = sql_session.scalars(select(Product).where(Product.name == "Test Product 1")).one()
+    user1 = sql_session.scalars(select(User).where(User.name == "Test User 1")).one()
+
+    product1_price = product1.price(sql_session)
+
+    with pytest.raises(IntegrityError):
+        transaction = Transaction.buy_product(
+            time=datetime(2023, 10, 1, 12, 0, 7),
+            amount= product1_price * 4 + 1,  # Incorrect amount
+            product_count=4,
+            user_id=user1.id,
+            product_id=product1.id,
+        )
+        sql_session.add(transaction)
+        sql_session.commit()
+
+
+def test_not_allowed_to_buy_with_too_little_balance(sql_session: Session):
+    ...