pub(crate) fn tx_rollback(mut self, description: &'static str, tx: Transaction) -> Self {
        self.actions
            .push_back(ScenarioItem::Rollback(description, tx));
        self
    }
Expect the state keeper to rollback the transaction (i.e. return to the mempool).
core/node/state_keeper/src/testonly/test_batch_executor.rs