WIP

tests/test_transaction.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(user1)
+    sql_session.add(user2)
+    sql_session.commit()
+
+    # Add products
+    product1 = Product("1234567890123", "Test Product 1")
+    product2 = Product("9876543210987", "Test Product 2")
+    sql_session.add(product1)
+    sql_session.add(product2)
+    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,
+        ),
+    ]
+
+    sql_session.add_all(transactions)
+    sql_session.commit()
+
+def test_no_duplicate_timestamps(sql_session: Session):
+    """
+    Ensure that no two transactions have the same timestamp.
+    """
+    # Insert test data
+    insert_test_data(sql_session)
+
+    user1 = sql_session.scalar(
+        select(User).where(User.name == "Test User 1")
+    )
+
+    assert user1 is not None, "Test User 1 should exist"
+
+    transaction_to_duplicate = sql_session.scalar(
+        select(Transaction).limit(1)
+    )
+
+    assert transaction_to_duplicate is not None, "There should be at least one transaction"
+
+    duplicate_timestamp_transaction = Transaction.adjust_balance(
+        time=transaction_to_duplicate.time,  # Use the same timestamp as an existing transaction
+        amount=50,
+        user_id=user1.id,
+    )
+
+    with pytest.raises(IntegrityError):
+        sql_session.add(duplicate_timestamp_transaction)
+        sql_session.commit()