Update models for event sourcing

tests/models/test_product.py

@@ -0,0 +1,32 @@
+import pytest
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import Session
+
+from dibbler.models import Product
+
+
+def insert_test_data(sql_session: Session) -> Product:
+    product = Product("1234567890123", "Test Product")
+    sql_session.add(product)
+    sql_session.commit()
+    return product
+
+
+def test_product_no_duplicate_barcodes(sql_session: Session):
+    product = insert_test_data(sql_session)
+
+    duplicate_product = Product(product.bar_code, "Hehe >:)")
+    sql_session.add(duplicate_product)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()
+
+
+def test_product_no_duplicate_names(sql_session: Session):
+    product = insert_test_data(sql_session)
+
+    duplicate_product = Product("1918238911928", product.name)
+    sql_session.add(duplicate_product)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()

tests/models/test_transaction.py

@@ -0,0 +1,157 @@
+from datetime import datetime
+
+import pytest
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import Session
+
+from dibbler.models import Product, Transaction, User
+from dibbler.queries import product_stock
+
+
+def insert_test_data(sql_session: Session) -> tuple[User, Product]:
+    user = User("Test User")
+    product = Product("1234567890123", "Test Product")
+
+    sql_session.add(user)
+    sql_session.add(product)
+    sql_session.commit()
+
+    return user, product
+
+
+def test_user_not_allowed_to_transfer_to_self(sql_session: Session) -> None:
+    user, _ = insert_test_data(sql_session)
+
+    transaction = Transaction.transfer(
+        time=datetime(2023, 10, 1, 12, 0, 0),
+        user_id=user.id,
+        transfer_user_id=user.id,
+        amount=50,
+    )
+
+    sql_session.add(transaction)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()
+
+
+def test_product_foreign_key_constraint(sql_session: Session) -> None:
+    user, product = insert_test_data(sql_session)
+
+    transaction = Transaction.add_product(
+        time=datetime(2023, 10, 1, 12, 0, 0),
+        user_id=user.id,
+        product_id=product.id,
+        amount=27,
+        per_product=27,
+        product_count=1,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()
+
+    # Attempt to add a transaction with a non-existent product
+    invalid_transaction = Transaction.add_product(
+        time=datetime(2023, 10, 1, 12, 0, 1),
+        user_id=user.id,
+        product_id=9999,  # Non-existent product ID
+        amount=27,
+        per_product=27,
+        product_count=1,
+    )
+
+    sql_session.add(invalid_transaction)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()
+
+
+def test_user_foreign_key_constraint(sql_session: Session) -> None:
+    user, product = insert_test_data(sql_session)
+
+    transaction = Transaction.add_product(
+        time=datetime(2023, 10, 1, 12, 0, 0),
+        user_id=user.id,
+        product_id=product.id,
+        amount=27,
+        per_product=27,
+        product_count=1,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()
+
+    # Attempt to add a transaction with a non-existent user
+    invalid_transaction = Transaction.add_product(
+        time=datetime(2023, 10, 1, 12, 0, 1),
+        user_id=9999,  # Non-existent user ID
+        product_id=product.id,
+        amount=27,
+        per_product=27,
+        product_count=1,
+    )
+
+    sql_session.add(invalid_transaction)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()
+
+
+def test_transaction_buy_product_more_than_stock(sql_session: Session) -> None:
+    user, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 13, 0, 0),
+            product_count=10,
+            user_id=user.id,
+            product_id=product.id,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    assert product_stock(sql_session, product) == 1 - 10
+
+
+def test_transaction_add_product_deny_amount_over_per_product_times_product_count(
+    sql_session: Session,
+) -> None:
+    user, product = insert_test_data(sql_session)
+
+    with pytest.raises(ValueError):
+        _transaction = Transaction.add_product(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 2 + 1,  # Invalid amount
+            per_product=27,
+            product_count=2,
+        )
+
+
+def test_transaction_add_product_allow_amount_under_per_product_times_product_count(
+    sql_session: Session,
+) -> None:
+    user, product = insert_test_data(sql_session)
+
+    transaction = Transaction.add_product(
+        time=datetime(2023, 10, 1, 12, 0, 0),
+        user_id=user.id,
+        product_id=product.id,
+        amount=27 * 2 - 1,  # Valid amount
+        per_product=27,
+        product_count=2,
+    )
+
+    sql_session.add(transaction)
+    sql_session.commit()

tests/models/test_user.py

@@ -0,0 +1,23 @@
+import pytest
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import Session
+
+from dibbler.models import User
+
+
+def insert_test_data(sql_session: Session) -> User:
+    user = User("Test User")
+    sql_session.add(user)
+    sql_session.commit()
+
+    return user
+
+
+def test_ensure_no_duplicate_user_names(sql_session: Session):
+    user = insert_test_data(sql_session)
+
+    user2 = User(user.name)
+    sql_session.add(user2)
+
+    with pytest.raises(IntegrityError):
+        sql_session.commit()