diff --git a/consensus/istanbul/backend/engine_test.go b/consensus/istanbul/backend/engine_test.go
index fd9b86066..5336617d8 100644
--- a/consensus/istanbul/backend/engine_test.go
+++ b/consensus/istanbul/backend/engine_test.go
@@ -1186,25 +1186,25 @@ func Test_BasedOnStaking(t *testing.T) {
 			[]int{},
 		},
 		{
-			[]uint64{5000000, 5000000, 5000000, 6000000},
+			[]uint64{6000000, 5000000, 5000000, 5000000},
 			true,
 			false,
-			[]int{3},
-			[]int{0, 1, 2},
+			[]int{0},
+			[]int{1, 2, 3},
 		},
 		{
-			[]uint64{5000000, 5000000, 6000000, 6000000},
+			[]uint64{6000000, 5000000, 5000000, 6000000},
 			true,
 			false,
-			[]int{2, 3},
-			[]int{0, 1},
+			[]int{0, 3},
+			[]int{1, 2},
 		},
 		{
-			[]uint64{5000000, 6000000, 6000000, 6000000},
+			[]uint64{6000000, 5000000, 6000000, 6000000},
 			true,
 			false,
-			[]int{1, 2, 3},
-			[]int{0},
+			[]int{0, 2, 3},
+			[]int{1},
 		},
 		{
 			[]uint64{6000000, 6000000, 6000000, 6000000},
diff --git a/consensus/istanbul/validator.go b/consensus/istanbul/validator.go
index 852c7fff5..0a8e47ddb 100644
--- a/consensus/istanbul/validator.go
+++ b/consensus/istanbul/validator.go
@@ -144,12 +144,14 @@ func NewBlockValSet(council, qualified valset.AddressList) *BlockValSet {
 func (cs *BlockValSet) Council() valset.AddressList   { return cs.council }
 func (cs *BlockValSet) Qualified() valset.AddressList { return cs.qualified }
 func (cs *BlockValSet) Demoted() valset.AddressList   { return cs.demoted }
-func (cs *BlockValSet) IsQualifiedMember(addr common.Address) bool {
-	return cs.qualified.GetIdxByAddress(addr) >= 0
-}
 func (cs *BlockValSet) IsCouncilMember(addr common.Address) bool {
 	return cs.council.GetIdxByAddress(addr) >= 0
 }
+
+func (cs *BlockValSet) IsQualifiedMember(addr common.Address) bool {
+	return cs.qualified.GetIdxByAddress(addr) >= 0
+}
+
 func (cs *BlockValSet) CheckValidatorSignature(data []byte, sig []byte) (common.Address, error) {
 	// 1. Get signature address
 	signer, err := GetSignatureAddress(data, sig)
@@ -182,11 +184,11 @@ func (cs *RoundCommitteeState) Committee() valset.AddressList { return cs.commit
 func (cs *RoundCommitteeState) NonCommittee() valset.AddressList {
 	return cs.qualified.Subtract(cs.committee)
 }
-func (cs *RoundCommitteeState) Proposer() common.Address { return cs.proposer }
+func (cs *RoundCommitteeState) Proposer() common.Address            { return cs.proposer }
+func (cs *RoundCommitteeState) IsProposer(addr common.Address) bool { return cs.proposer == addr }
 func (cs *RoundCommitteeState) IsCommitteeMember(addr common.Address) bool {
 	return cs.committee.GetIdxByAddress(addr) >= 0
 }
-func (cs *RoundCommitteeState) IsProposer(addr common.Address) bool { return cs.proposer == addr }
 
 // RequiredMessageCount returns a minimum required number of consensus messages to proceed
 func (cs *RoundCommitteeState) RequiredMessageCount() int {
diff --git a/kaiax/valset/addressList.go b/kaiax/valset/addressList.go
index 00edfaae6..b6a5320cd 100644
--- a/kaiax/valset/addressList.go
+++ b/kaiax/valset/addressList.go
@@ -41,7 +41,7 @@ func (sc *AddressList) Remove(addr common.Address) bool {
 }
 
 func (sc AddressList) Copy() AddressList {
-	var copied AddressList
+	copied := make(AddressList, 0)
 	for _, val := range sc {
 		copied = append(copied, val)
 	}
diff --git a/tests/hard_fork_test.go b/tests/hard_fork_test.go
index fed40674b..129fb7e9e 100644
--- a/tests/hard_fork_test.go
+++ b/tests/hard_fork_test.go
@@ -23,7 +23,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	valset_impl "github.com/kaiachain/kaia/kaiax/valset/impl"
 	"math/big"
 	"os"
 	"strings"
@@ -43,6 +42,7 @@ import (
 	gov_impl "github.com/kaiachain/kaia/kaiax/gov/impl"
 	reward_impl "github.com/kaiachain/kaia/kaiax/reward/impl"
 	staking_impl "github.com/kaiachain/kaia/kaiax/staking/impl"
+	valset_impl "github.com/kaiachain/kaia/kaiax/valset/impl"
 	"github.com/kaiachain/kaia/log"
 	"github.com/kaiachain/kaia/params"
 	"github.com/kaiachain/kaia/rlp"
diff --git a/tests/init.go b/tests/init.go
index ac452abfa..9edaf3536 100644
--- a/tests/init.go
+++ b/tests/init.go
@@ -94,9 +94,8 @@ var Forks = map[string]*params.ChainConfig{
 		Kip103CompatibleBlock:    new(big.Int),
 		ShanghaiCompatibleBlock:  new(big.Int),
 		CancunCompatibleBlock:    new(big.Int),
-		//RandaoCompatibleBlock:    new(big.Int),
-		KaiaCompatibleBlock:   new(big.Int),
-		Kip160CompatibleBlock: new(big.Int),
+		KaiaCompatibleBlock:      new(big.Int),
+		Kip160CompatibleBlock:    new(big.Int),
 	},
 	"Prague": {
 		ChainID:                  big.NewInt(1),
@@ -108,10 +107,9 @@ var Forks = map[string]*params.ChainConfig{
 		Kip103CompatibleBlock:    new(big.Int),
 		ShanghaiCompatibleBlock:  new(big.Int),
 		CancunCompatibleBlock:    new(big.Int),
-		//RandaoCompatibleBlock:    new(big.Int),
-		KaiaCompatibleBlock:   new(big.Int),
-		Kip160CompatibleBlock: new(big.Int),
-		PragueCompatibleBlock: new(big.Int),
+		KaiaCompatibleBlock:      new(big.Int),
+		Kip160CompatibleBlock:    new(big.Int),
+		PragueCompatibleBlock:    new(big.Int),
 	},
 }
 
diff --git a/tests/tx_validation_test.go b/tests/tx_validation_test.go
index a8d110367..ff6c10aa4 100644
--- a/tests/tx_validation_test.go
+++ b/tests/tx_validation_test.go
@@ -976,7 +976,7 @@ func TestInvalidBalance(t *testing.T) {
 	prof := profile.NewProfiler()
 
 	// Initialize blockchain
-	bcdata, err := NewBCData(6, 4)
+	bcdata, err := NewBCDataWithForkConfig(6, 4, Forks["Prague"])
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1370,7 +1370,7 @@ func TestInvalidBalanceBlockTx(t *testing.T) {
 	prof := profile.NewProfiler()
 
 	// Initialize blockchain
-	bcdata, err := NewBCData(6, 4)
+	bcdata, err := NewBCDataWithForkConfig(6, 4, Forks["Prague"])
 	if err != nil {
 		t.Fatal(err)
 	}