op-deployer: add test for deployConfig overrides (#12985)

Test hard fork offset overrides
Co-authored-by: Vinod Damle <vinod@oplabs.co>

op-deployer/pkg/deployer/state/deploy_config_test.go

+package state
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCombineDeployConfig(t *testing.T) {
+	intent := Intent{
+		L1ChainID: 1,
+	}
+	chainState := ChainState{
+		ID: common.HexToHash("0x123"),
+	}
+	chainIntent := ChainIntent{
+		Eip1559Denominator:         1,
+		Eip1559Elasticity:          2,
+		BaseFeeVaultRecipient:      common.HexToAddress("0x123"),
+		L1FeeVaultRecipient:        common.HexToAddress("0x456"),
+		SequencerFeeVaultRecipient: common.HexToAddress("0x789"),
+		Roles: ChainRoles{
+			SystemConfigOwner: common.HexToAddress("0x123"),
+			L1ProxyAdminOwner: common.HexToAddress("0x456"),
+			L2ProxyAdminOwner: common.HexToAddress("0x789"),
+			UnsafeBlockSigner: common.HexToAddress("0xabc"),
+			Batcher:           common.HexToAddress("0xdef"),
+		},
+	}
+	state := State{
+		SuperchainDeployment: &SuperchainDeployment{ProtocolVersionsProxyAddress: common.HexToAddress("0x123")},
+	}
+
+	// apply hard fork overrides
+	chainIntent.DeployOverrides = map[string]any{
+		"l2GenesisGraniteTimeOffset":  "0x8",
+		"l2GenesisHoloceneTimeOffset": "0x10",
+	}
+
+	out, err := CombineDeployConfig(&intent, &chainIntent, &state, &chainState)
+	require.NoError(t, err)
+	require.Equal(t, *out.L2InitializationConfig.UpgradeScheduleDeployConfig.L2GenesisFjordTimeOffset, hexutil.Uint64(0))
+	require.Equal(t, *out.L2InitializationConfig.UpgradeScheduleDeployConfig.L2GenesisGraniteTimeOffset, hexutil.Uint64(8))
+	require.Equal(t, *out.L2InitializationConfig.UpgradeScheduleDeployConfig.L2GenesisHoloceneTimeOffset, hexutil.Uint64(16))
+}