op-acceptance-tests: Add EL eth_simulate acceptance test

op-acceptance-tests/tests/base/eth_simulate_test.go

@@ -0,0 +1,81 @@
+package base
+
+import (
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-devstack/devtest"
+	"github.com/ethereum-optimism/optimism/op-devstack/presets"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestEthSimulateV1(gt *testing.T) {
+	t := devtest.ParallelT(gt)
+	sys := presets.NewMinimal(t)
+	ctx := t.Ctx()
+
+	type SimulateParams struct {
+		ReturnFullTransactions bool
+		BlockStateCalls        []any `json:"blockStateCalls"`
+	}
+
+	params := SimulateParams{
+		ReturnFullTransactions: true,
+		BlockStateCalls: []any{
+			map[string]any{
+				"calls": []any{
+					map[string]any{
+						"from": "0x0000000000000000000000000000000000000000",
+						"to":   "0x0000000000000000000000000000000000000000",
+						"data": "0x",
+					},
+				},
+			},
+		},
+	}
+
+	// wait until the chain mines at least one block
+	// (known limitation that we cannot simulate on top of the genesis block,
+	// Since the EL will just reuse the l1 attributes tx from the previous block
+	// and there is no such transaction for the genesis block).
+	sys.L1Network.WaitForBlock()
+
+	// Require the RPC call to succeed
+	rpcClient := sys.L2EL.Escape().EthClient().RPC()
+	var resp []map[string]any
+	err := rpcClient.CallContext(
+		ctx,
+		&resp,
+		"eth_simulateV1",
+		params,
+		"0x1", // Block 1
+	)
+	require.NoError(t, err)
+
+	// Require exactly one block, matching input
+	require.Len(t, resp, 1)
+	respBlock := resp[0]
+
+	// Require exactly one transaction, matching input
+	require.Len(t, respBlock["transactions"], 1)
+	transaction := (respBlock["transactions"].([]any)[0]).(map[string]any)
+
+	// Transaction type should be dynamic fee transaction type, not a deposit transaction.
+	require.Equal(t, "0x2", transaction["type"]) // 0x02 is the dynamic fee transaction type
+
+	// Check Blob Gas Used is nonzero
+	// This proves out that eth_simulateV1 can be used to estimate the DA size of a transaction
+	bgu, err := hexutil.DecodeUint64(respBlock["blobGasUsed"].(string))
+	require.NoError(t, err)
+	require.NotZero(t, bgu)
+
+	err = rpcClient.CallContext(
+		ctx,
+		&resp,
+		"eth_simulateV1",
+		params,
+		"0x0", // Genesis block
+	)
+	t.Log("resp", resp)
+	require.Error(t, err, "eth_simulateV1 cannot be used on the genesis block")
+}