Mock Unit of Work commit and rollback in Python

from unittest import mock


class UnitOfWork:
    def __init__(self):
        self.committed = False
        self.rolled_back = False

    def commit(self):
        self.committed = True
        print("Commit executed")

    def rollback(self):
        self.rolled_back = True
        print("Rollback executed")


def business_operation(uow):
    try:
        # Some work...
        uow.commit()
    except Exception:
        uow.rollback()
        raise


if __name__ == "__main__":
    uow = UnitOfWork()

    # Mock the commit and rollback methods to verify calls
    with mock.patch.object(uow, "commit") as mock_commit, mock.patch.object(uow, "rollback") as mock_rollback:
        business_operation(uow)
        mock_commit.assert_called_once()
        mock_rollback.assert_not_called()
        print("Success path: commit called, rollback not called")

    # Simulate a failure to test rollback
    with mock.patch("__main__.business_operation", side_effect=Exception("Simulated failure")):
        try:
            business_operation(uow)
        except Exception:
            print("Failure path: exception raised as expected")