def test(save_to_db):
save_to_db.return_value = None
save_transaction('mock_transaction_id', '$23.22')
save_to_db.assert_called_with(key='mock_transaction_id', value='$23.22', print_result=True)
assert save_transaction(transaction_id=None, value='$44.99') is None
save_to_db.assert_called_with(key=None, value='$44.99', print_result=True)
def test(get_database):
database_mock = Mock()
database_mock.__setitem__ = Mock(return_value=None)
get_database.return_value = database_mock
assert save_transaction('fds', '$12.00', False) == None
