From 77df3c7556a2ebb80c76059c4effbb5c856c5fd4 Mon Sep 17 00:00:00 2001
From: Ganesh Vanahalli <gvanahalli@offchainlabs.com>
Date: Fri, 27 Dec 2024 10:07:58 -0600
Subject: [PATCH] fix stubPublisher in express_lane_service_test.go

---
 execution/gethexec/express_lane_service.go    |  8 ++----
 .../gethexec/express_lane_service_test.go     | 26 ++++++++++---------
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/execution/gethexec/express_lane_service.go b/execution/gethexec/express_lane_service.go
index 6dbcc4e9af..c8339feac7 100644
--- a/execution/gethexec/express_lane_service.go
+++ b/execution/gethexec/express_lane_service.go
@@ -361,14 +361,10 @@ func (es *expressLaneService) sequenceExpressLaneSubmission(
 		if err := es.transactionPublisher.PublishTimeboostedTransaction(
 			ctx,
 			nextMsg.Transaction,
-			msg.Options,
+			nextMsg.Options,
 		); err != nil {
-			txHash := common.Hash{}
-			if nextMsg.Transaction != nil {
-				txHash = nextMsg.Transaction.Hash()
-			}
 			// If the tx fails we return an error with all the necessary info for the controller to successfully try again
-			return fmt.Errorf("express lane transaction of sequence number: %d and transaction hash: %v, failed with an error: %w", nextMsg.SequenceNumber, txHash, err)
+			return fmt.Errorf("express lane transaction of sequence number: %d and transaction hash: %v, failed with an error: %w", nextMsg.SequenceNumber, nextMsg.Transaction.Hash(), err)
 		}
 		// Increase the global round sequence number.
 		control.sequence += 1
diff --git a/execution/gethexec/express_lane_service_test.go b/execution/gethexec/express_lane_service_test.go
index 6ec62b937b..86484db62a 100644
--- a/execution/gethexec/express_lane_service_test.go
+++ b/execution/gethexec/express_lane_service_test.go
@@ -297,8 +297,10 @@ func makeStubPublisher(els *expressLaneService) *stubPublisher {
 	}
 }
 
+var emptyTx = types.NewTransaction(0, common.MaxAddress, big.NewInt(0), 0, big.NewInt(0), nil)
+
 func (s *stubPublisher) PublishTimeboostedTransaction(parentCtx context.Context, tx *types.Transaction, options *arbitrum_types.ConditionalOptions) error {
-	if tx == nil {
+	if tx.Hash() != emptyTx.Hash() {
 		return errors.New("oops, bad tx")
 	}
 	control, _ := s.els.roundControl.Get(0)
@@ -369,23 +371,23 @@ func Test_expressLaneService_sequenceExpressLaneSubmission_outOfOrder(t *testing
 	messages := []*timeboost.ExpressLaneSubmission{
 		{
 			SequenceNumber: 10,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 		{
 			SequenceNumber: 5,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 		{
 			SequenceNumber: 1,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 		{
 			SequenceNumber: 4,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 		{
 			SequenceNumber: 2,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 	}
 	for _, msg := range messages {
@@ -396,7 +398,7 @@ func Test_expressLaneService_sequenceExpressLaneSubmission_outOfOrder(t *testing
 	require.Equal(t, 2, len(stubPublisher.publishedTxOrder))
 	require.Equal(t, 3, len(els.messagesBySequenceNumber)) // Processed txs are deleted
 
-	err := els.sequenceExpressLaneSubmission(ctx, &timeboost.ExpressLaneSubmission{SequenceNumber: 3, Transaction: &types.Transaction{}})
+	err := els.sequenceExpressLaneSubmission(ctx, &timeboost.ExpressLaneSubmission{SequenceNumber: 3, Transaction: emptyTx})
 	require.NoError(t, err)
 	require.Equal(t, 5, len(stubPublisher.publishedTxOrder))
 }
@@ -417,23 +419,23 @@ func Test_expressLaneService_sequenceExpressLaneSubmission_erroredTx(t *testing.
 	messages := []*timeboost.ExpressLaneSubmission{
 		{
 			SequenceNumber: 1,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 		{
 			SequenceNumber: 3,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 		{
 			SequenceNumber: 2,
-			Transaction:    nil,
+			Transaction:    types.NewTransaction(0, common.MaxAddress, big.NewInt(0), 0, big.NewInt(0), []byte{1}),
 		},
 		{
 			SequenceNumber: 2,
-			Transaction:    &types.Transaction{},
+			Transaction:    emptyTx,
 		},
 	}
 	for _, msg := range messages {
-		if msg.Transaction == nil {
+		if msg.Transaction.Hash() != emptyTx.Hash() {
 			err := els.sequenceExpressLaneSubmission(ctx, msg)
 			require.ErrorContains(t, err, "oops, bad tx")
 		} else {