Write a set of queries to go along with the event sourcing model

tests/queries/test_joint_buy_product.py

@@ -0,0 +1,198 @@
+from datetime import datetime
+
+import pytest
+from sqlalchemy.orm import Session
+
+from dibbler.models import Product, Transaction, User
+from dibbler.queries import joint_buy_product
+
+
+def insert_test_data(sql_session: Session) -> tuple[User, User, User, Product]:
+    user1 = User("Test User 1")
+    user2 = User("Test User 2")
+    user3 = User("Test User 3")
+    product = Product("1234567890123", "Test Product")
+
+    sql_session.add_all([user1, user2, user3, product])
+    sql_session.commit()
+
+    transactions = [
+        Transaction.add_product(
+            user_id=user1.id,
+            product_id=product.id,
+            amount=30,
+            per_product=10,
+            product_count=3,
+            time=datetime(2024, 1, 1, 10, 0, 0),
+        )
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    return user1, user2, user3, product
+
+
+def test_joint_buy_product_uninitialized_product(sql_session: Session) -> None:
+    user = User("Test User 1")
+    sql_session.add(user)
+    sql_session.commit()
+
+    product = Product("1234567890123", "Uninitialized Product")
+
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=user,
+            users=[user],
+            product=product,
+            product_count=1,
+        )
+
+
+def test_joint_buy_product_no_users(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=user,
+            users=[],
+            product=product,
+            product_count=1,
+        )
+
+
+def test_joint_buy_product_uninitialized_instigator(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    uninitialized_user = User("Uninitialized User")
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=uninitialized_user,
+            users=[user, user2],
+            product=product,
+            product_count=1,
+        )
+
+
+def test_joint_buy_product_uninitialized_user_in_list(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    uninitialized_user = User("Uninitialized User")
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=user,
+            users=[user, uninitialized_user],
+            product=product,
+            product_count=1,
+        )
+
+
+def test_joint_buy_product_invalid_product_count(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=user,
+            users=[user],
+            product=product,
+            product_count=0,
+        )
+
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=user,
+            users=[user],
+            product=product,
+            product_count=-1,
+        )
+
+
+def test_joint_single_user(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user],
+        product=product,
+        product_count=1,
+    )
+
+
+def test_joint_buy_product(sql_session: Session) -> None:
+    user, user2, user3, product = insert_test_data(sql_session)
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2, user3],
+        product=product,
+        product_count=1,
+    )
+
+
+def test_joint_buy_product_more_than_in_stock(sql_session: Session) -> None:
+    user, user2, user3, product = insert_test_data(sql_session)
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2, user3],
+        product=product,
+        product_count=5,
+    )
+
+
+def test_joint_buy_product_out_of_stock(sql_session: Session) -> None:
+    user, user2, user3, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.buy_product(
+            user_id=user.id,
+            product_id=product.id,
+            product_count=3,
+            time=datetime(2024, 1, 2, 10, 0, 0),
+        )
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2, user3],
+        product=product,
+        product_count=10,
+    )
+
+
+def test_joint_buy_product_duplicate_user(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user, user2],
+        product=product,
+        product_count=1,
+    )
+
+
+def test_joint_buy_product_non_involved_instigator(sql_session: Session) -> None:
+    user, user2, user3, product = insert_test_data(sql_session)
+
+    with pytest.raises(ValueError):
+        joint_buy_product(
+            sql_session,
+            instigator=user,
+            users=[user2, user3],
+            product=product,
+            product_count=1,
+        )