op-e2e: Use a synchronous approach to get transactions into the pool in TestBigL2Txs

op-e2e/actions/l2_batcher_test.go

@@ -464,7 +464,7 @@ func TestBigL2Txs(gt *testing.T) {
 				Value:     big.NewInt(0),
 				Data:      data,
 			})
-			require.NoError(gt, cl.SendTransaction(t.Ctx(), tx))
+			engine.ActSendTx(t, tx)
 			engine.ActL2IncludeTx(dp.Addresses.Alice)(t)
 		}
 		sequencer.ActL2EndBlock(t)
@@ -504,7 +504,7 @@ func TestBigL2Txs(gt *testing.T) {
 			if miner.l1GasPool.Gas() < tx.Gas() { // fill the L1 block with batcher txs until we run out of gas
 				break
 			}
-			log.Info("including batcher tx", "nonce", tx)
+			log.Info("including batcher tx", "nonce", tx.Nonce())
 			miner.IncludeTx(t, tx)
 			txs = txs[1:]
 		}

op-e2e/actions/l2_engine.go

@@ -168,6 +168,13 @@ func (e *L2Engine) ActL2RPCFail(t Testing) {
 	e.failL2RPC = errors.New("mock L2 RPC error")
 }
 
+// ActSendTx adds a transaction to the tx pool and ensures any required promotion to the pending tx queue is complete
+// before returning.
+func (e *L2Engine) ActSendTx(t Testing, tx *types.Transaction) {
+	err := errors.Join(e.eth.TxPool().Add([]*types.Transaction{tx}, true, true)...)
+	require.NoError(t, err, "Add tx to pool")
+}
+
 // ActL2IncludeTx includes the next transaction from the given address in the block that is being built
 func (e *L2Engine) ActL2IncludeTx(from common.Address) Action {
 	return func(t Testing) {