fix(CORE-2383): use require over assert and fix simulated backend deprecation in ccipevm tests

- Replace assert with require before slice access in executecodec_test to avoid panics on failure
- Increase simulated backend EVM timeout from 5s to 60s in msghasher_test
- Replace deprecated backends.NewSimulatedBackend with simulated.NewBackend in both test files

Author: Fletch153

core/capabilities/ccip/ccipevm/executecodec_test.go

@@ -10,7 +10,8 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient/simulated"
 	chainsel "github.com/smartcontractkit/chain-selectors"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
@@ -173,9 +174,10 @@ func TestExecutePluginCodecV1(t *testing.T) {
 
 	// Deploy the contract
 	transactor := evmtestutils.MustNewSimTransactor(t)
-	simulatedBackend := backends.NewSimulatedBackend(core.GenesisAlloc{
+	b := simulated.NewBackend(types.GenesisAlloc{
 		transactor.From: {Balance: assets.Ether(1000).ToInt()},
-	}, 30e6)
+	}, simulated.WithBlockGasLimit(30e6))
+	simulatedBackend := &backends.SimulatedBackend{Backend: b, Client: b.Client()}
 	address, _, _, err := report_codec.DeployReportCodec(transactor, simulatedBackend)
 	require.NoError(t, err)
 	simulatedBackend.Commit()
@@ -213,8 +215,8 @@ func TestExecutePluginCodecV1(t *testing.T) {
 
 			// decode using the contract
 			contractDecodedReport, err := contract.DecodeExecuteReport(&bind.CallOpts{Context: ctx}, bytes)
-			assert.NoError(t, err)
-			assert.Len(t, contractDecodedReport, len(report.ChainReports))
+			require.NoError(t, err)
+			require.Len(t, contractDecodedReport, len(report.ChainReports))
 			for i, expReport := range report.ChainReports {
 				actReport := contractDecodedReport[i]
 				assert.Equal(t, expReport.OffchainTokenData, actReport.OffchainTokenData)

core/capabilities/ccip/ccipevm/msghasher_test.go

@@ -14,12 +14,16 @@ import (
 	"strings"
 	"testing"
 
+	"time"
+
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth/ethconfig"
+	"github.com/ethereum/go-ethereum/ethclient/simulated"
+	"github.com/ethereum/go-ethereum/node"
 	agbinary "github.com/gagliardetto/binary"
 	solanago "github.com/gagliardetto/solana-go"
 	chainsel "github.com/smartcontractkit/chain-selectors"
@@ -199,9 +203,12 @@ type testSetupData struct {
 
 func testSetup(t *testing.T) *testSetupData {
 	transactor := evmtestutils.MustNewSimTransactor(t)
-	simulatedBackend := backends.NewSimulatedBackend(core.GenesisAlloc{
+	b := simulated.NewBackend(types.GenesisAlloc{
 		transactor.From: {Balance: assets.Ether(1000).ToInt()},
-	}, 30e6)
+	}, simulated.WithBlockGasLimit(30e6), func(_ *node.Config, ethCfg *ethconfig.Config) {
+		ethCfg.RPCEVMTimeout = 60 * time.Second
+	})
+	simulatedBackend := &backends.SimulatedBackend{Backend: b, Client: b.Client()}
 
 	// Deploy the contract
 	address, _, _, err := message_hasher.DeployMessageHasher(transactor, simulatedBackend)