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

2025-12-10 16:00:36 +09:00
parent 41e46f71b9
commit 2a0d3570f0
40 changed files with 5464 additions and 74 deletions
@@ -0,0 +1,958 @@
+import math
+from datetime import datetime
+from pprint import pprint
+
+import pytest
+from sqlalchemy.orm import Session
+
+from dibbler.models import Product, Transaction, User
+from dibbler.models.Transaction import (
+    DEFAULT_INTEREST_RATE_PERCENT,
+    DEFAULT_PENALTY_MULTIPLIER_PERCENT,
+)
+from dibbler.queries import joint_buy_product, user_balance, user_balance_log
+from dibbler.queries.user_balance import _joint_transaction_query, _non_joint_transaction_query
+
+# TODO: see if we can use pytest_runtest_makereport to print the "user_balance_log"s
+#       only on failures instead of inlining it in every test function
+
+
+def insert_test_data(sql_session: Session) -> tuple[User, User, User, Product]:
+    user = User("Test User")
+    user2 = User("Test User 2")
+    user3 = User("Test User 3")
+    product = Product("1234567890123", "Test Product")
+
+    sql_session.add_all([user, user2, user3, product])
+    sql_session.commit()
+
+    return user, user2, user3, product
+
+
+def _product_cost(
+    per_product: int,
+    product_count: int,
+    interest_rate_percent: int = DEFAULT_INTEREST_RATE_PERCENT,
+    apply_penalty: bool = False,
+    penalty_multiplier_percent: int = DEFAULT_PENALTY_MULTIPLIER_PERCENT,
+    joint_shares: int = 1,
+    joint_total_shares: int = 1,
+) -> int:
+    base_cost = per_product * product_count * joint_shares / joint_total_shares
+    cost_with_interest = math.ceil(base_cost * (interest_rate_percent / 100))
+    if apply_penalty:
+        total_cost = math.ceil(cost_with_interest * (penalty_multiplier_percent / 100))
+    else:
+        total_cost = cost_with_interest
+    return total_cost
+
+
+def test_non_joint_transaction_query(sql_session) -> None:
+    user1, user2, user3, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user1.id,
+            amount=100,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user2.id,
+            amount=50,
+        ),
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 1),
+            user_id=user2.id,
+            amount=70,
+            product_id=product.id,
+            product_count=3,
+            per_product=30,
+        ),
+        Transaction.transfer(
+            time=datetime(2023, 10, 1, 10, 0, 2),
+            user_id=user1.id,
+            transfer_user_id=user2.id,
+            amount=50,
+        ),
+        Transaction.transfer(
+            time=datetime(2023, 10, 1, 10, 0, 3),
+            user_id=user2.id,
+            transfer_user_id=user3.id,
+            amount=30,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    t = transactions
+
+    result = {
+        row[0]
+        for row in sql_session.execute(
+            _non_joint_transaction_query(
+                user_id=user1.id,
+                use_cache=False,
+            ),
+        ).all()
+    }
+    assert result == {t[0].id, t[3].id}
+
+    result = {
+        row[0]
+        for row in sql_session.execute(
+            _non_joint_transaction_query(
+                user_id=user2.id,
+                use_cache=False,
+            ),
+        ).all()
+    }
+    assert result == {t[1].id, t[2].id, t[3].id, t[4].id}
+
+    result = {
+        row[0]
+        for row in sql_session.execute(
+            _non_joint_transaction_query(
+                user_id=user3.id,
+                use_cache=False,
+            ),
+        ).all()
+    }
+    assert result == {t[4].id}
+
+
+def test_joint_transaction_query(sql_session: Session) -> None:
+    user1, user2, user3, product = insert_test_data(sql_session)
+
+    j1 = joint_buy_product(
+        sql_session,
+        product=product,
+        product_count=3,
+        instigator=user1,
+        users=[user1, user2],
+    )
+
+    j2 = joint_buy_product(
+        sql_session,
+        product=product,
+        product_count=2,
+        instigator=user1,
+        users=[user1, user1, user2],
+    )
+
+    j3 = joint_buy_product(
+        sql_session,
+        product=product,
+        product_count=2,
+        instigator=user1,
+        users=[user1, user3, user3],
+    )
+
+    j4 = joint_buy_product(
+        sql_session,
+        product=product,
+        product_count=2,
+        instigator=user2,
+        users=[user2, user3, user3],
+    )
+
+    result = set(
+        sql_session.execute(
+            _joint_transaction_query(
+                user_id=user1.id,
+                use_cache=False,
+            ),
+        ).all(),
+    )
+    assert result == {
+        (j1[0].id, 1, 2),
+        (j2[0].id, 2, 3),
+        (j3[0].id, 1, 3),
+    }
+
+    result = set(
+        sql_session.execute(
+            _joint_transaction_query(
+                user_id=user2.id,
+                use_cache=False,
+            ),
+        ).all(),
+    )
+    assert result == {
+        (j1[0].id, 1, 2),
+        (j2[0].id, 1, 3),
+        (j4[0].id, 1, 3),
+    }
+
+    result = set(
+        sql_session.execute(
+            _joint_transaction_query(
+                user_id=user3.id,
+                use_cache=False,
+            ),
+        ).all(),
+    )
+    assert result == {
+        (j3[0].id, 2, 3),
+        (j4[0].id, 2, 3),
+    }
+
+
+def test_user_balance_no_transactions(sql_session: Session) -> None:
+    user, *_ = insert_test_data(sql_session)
+
+    pprint(user_balance_log(sql_session, user))
+
+    balance = user_balance(sql_session, user)
+
+    assert balance == 0
+
+
+def test_user_balance_basic_history(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            amount=100,
+        ),
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 1),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user))
+
+    balance = user_balance(sql_session, user)
+
+    assert balance == 100 + 27
+
+
+def test_user_balance_with_transfers(sql_session: Session) -> None:
+    user1, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user1.id,
+            amount=100,
+        ),
+        Transaction.transfer(
+            time=datetime(2023, 10, 1, 10, 0, 1),
+            user_id=user1.id,
+            transfer_user_id=user2.id,
+            amount=50,
+        ),
+        Transaction.transfer(
+            time=datetime(2023, 10, 1, 10, 0, 2),
+            user_id=user2.id,
+            transfer_user_id=user1.id,
+            amount=30,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user1))
+
+    user1_balance = user_balance(sql_session, user1)
+    assert user1_balance == 100 - 50 + 30
+
+    pprint(user_balance_log(sql_session, user2))
+
+    user2_balance = user_balance(sql_session, user2)
+    assert user2_balance == 50 - 30
+
+
+@pytest.mark.skip(reason="Not yet implemented")
+def test_user_balance_complex_history(sql_session: Session) -> None: ...
+
+
+def test_user_balance_penalty(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            amount=-200,
+        ),
+        # Penalized, pays 2x the price (default penalty)
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == 27 - 200 - _product_cost(27, 1, apply_penalty=True)
+
+
+def test_user_balance_changing_penalty(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            amount=-200,
+        ),
+        # Penalized, pays 2x the price (default penalty)
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+        Transaction.adjust_penalty(
+            time=datetime(2023, 10, 1, 13, 0, 0),
+            user_id=user.id,
+            penalty_multiplier_percent=300,
+            penalty_threshold=-100,
+        ),
+        # Penalized, pays 3x the price
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 14, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        27
+        - 200
+        - _product_cost(27, 1, apply_penalty=True)
+        - _product_cost(27, 1, apply_penalty=True, penalty_multiplier_percent=300)
+    )
+
+
+def test_user_balance_interest(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=110,
+        ),
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == 27 - _product_cost(27, 1, interest_rate_percent=110)
+
+
+def test_user_balance_changing_interest(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=110,
+        ),
+        # Pays 1.1x the price
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 13, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=120,
+        ),
+        # Pays 1.2x the price
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 14, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        27 * 3
+        - _product_cost(27, 1, interest_rate_percent=110)
+        - _product_cost(27, 1, interest_rate_percent=120)
+    )
+
+
+def test_user_balance_penalty_interest_combined(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=110,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            amount=-200,
+        ),
+        # Penalized, pays 2x the price (default penalty)
+        # Pays 1.1x the price
+        Transaction.buy_product(
+            time=datetime(2023, 10, 1, 13, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            product_count=1,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        27
+        - 200
+        - _product_cost(
+            27,
+            1,
+            interest_rate_percent=110,
+            apply_penalty=True,
+        )
+    )
+
+
+def test_user_balance_joint_transaction_single_user(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user],
+        product=product,
+        product_count=2,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=1,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_multiple_users(sql_session: Session) -> None:
+    user, user2, user3, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2, user3],
+        product=product,
+        product_count=2,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=3,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_multiple_times_self(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user, user2],
+        product=product,
+        product_count=2,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - _product_cost(
+            27,
+            2,
+            joint_shares=2,
+            joint_total_shares=3,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_interest(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=110,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=2,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=2,
+            interest_rate_percent=110,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_changing_interest(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 4,
+            per_product=27,
+            product_count=4,
+        ),
+        # Pays 1.1x the price
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=110,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=2,
+    )
+
+    transactions = [
+        # Pays 1.2x the price
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=120,
+        )
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=1,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 4)
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=2,
+            interest_rate_percent=110,
+        )
+        - _product_cost(
+            27,
+            1,
+            joint_shares=1,
+            joint_total_shares=2,
+            interest_rate_percent=120,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_penalty(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            amount=-200,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=2,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - 200
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=2,
+            apply_penalty=True,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_changing_penalty(sql_session: Session) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            amount=-200,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=2,
+    )
+
+    transactions = [
+        Transaction.adjust_penalty(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            penalty_multiplier_percent=300,
+            penalty_threshold=-100,
+        )
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=1,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - 200
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=2,
+            apply_penalty=True,
+        )
+        - _product_cost(
+            27,
+            1,
+            joint_shares=1,
+            joint_total_shares=2,
+            apply_penalty=True,
+            penalty_multiplier_percent=300,
+        )
+    )
+
+
+def test_user_balance_joint_transactions_penalty_interest_combined(
+    sql_session: Session,
+) -> None:
+    user, user2, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27 * 3,
+            per_product=27,
+            product_count=3,
+        ),
+        Transaction.adjust_interest(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            interest_rate_percent=110,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 12, 0, 0),
+            user_id=user.id,
+            amount=-200,
+        ),
+    ]
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    joint_buy_product(
+        sql_session,
+        instigator=user,
+        users=[user, user2],
+        product=product,
+        product_count=2,
+    )
+
+    pprint(user_balance_log(sql_session, user))
+
+    assert user_balance(sql_session, user) == (
+        (27 * 3)
+        - 200
+        - _product_cost(
+            27,
+            2,
+            joint_shares=1,
+            joint_total_shares=2,
+            interest_rate_percent=110,
+            apply_penalty=True,
+        )
+    )
+
+
+def test_user_balance_until_time(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            amount=100,
+        ),
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 1),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            amount=50,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    pprint(user_balance_log(sql_session, user, until_time=datetime(2023, 10, 1, 10, 30, 0)))
+
+    balance = user_balance(sql_session, user, until_time=datetime(2023, 10, 1, 10, 30, 0))
+
+    assert balance == 100 + 27
+
+
+def test_user_balance_until_transaction(sql_session: Session) -> None:
+    user, _, _, product = insert_test_data(sql_session)
+
+    transactions = [
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 10, 0, 0),
+            user_id=user.id,
+            amount=100,
+        ),
+        Transaction.add_product(
+            time=datetime(2023, 10, 1, 10, 0, 1),
+            user_id=user.id,
+            product_id=product.id,
+            amount=27,
+            per_product=27,
+            product_count=1,
+        ),
+        Transaction.adjust_balance(
+            time=datetime(2023, 10, 1, 11, 0, 0),
+            user_id=user.id,
+            amount=50,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+    until_transaction = transactions[1]
+
+    pprint(user_balance_log(sql_session, user, until_transaction=until_transaction))
+
+    balance = user_balance(sql_session, user, until_transaction=until_transaction)
+
+    assert balance == 100 + 27
+
+
+@pytest.mark.skip(reason="Not yet implemented")
+def test_user_balance_throw_away_products(sql_session: Session) -> None: ...