diff --git a/cluster/member_list_test.go b/cluster/member_list_test.go
index 0544922e7..9ee5e2689 100644
--- a/cluster/member_list_test.go
+++ b/cluster/member_list_test.go
@@ -56,119 +56,97 @@ func waitTimeout(wg *sync.WaitGroup, timeout time.Duration) bool {
 }
 
 func TestMemberList_UpdateClusterTopology(t *testing.T) {
-	t.Skip("Skipping test, test is wrong, not the code")
 	c := newClusterForTest("test-UpdateClusterTopology", nil)
-
 	obj := NewMemberList(c)
-	dumpMembers := func(list Members) {
-		t.Logf("membersByMemberId=%d", len(list))
-
-		for _, m := range list {
-			t.Logf("\t%s", m.Address())
-		}
-	}
-
 	empty := make([]*Member, 0)
 
-	_ = dumpMembers
-	_sorted := func(tpl *ClusterTopology) {
-		_sortMembers := func(list Members) {
-			sort.Slice(list, func(i, j int) bool {
-				return (list)[i].Port < (list)[j].Port
-			})
-		}
-		// dumpMembers(tpl.MemberSet)
-		_sortMembers(tpl.Members)
-		// dumpMembers(tpl.MemberSet)
-		_sortMembers(tpl.Left)
-		_sortMembers(tpl.Joined)
-	}
-
 	t.Run("init", func(t *testing.T) {
-		a := assert.New(t)
-		members := _newTopologyEventForTest(2)
-		changes, _, _, _, _ := obj.getTopologyChanges(members)
-		_sorted(changes)
+		assert := assert.New(t)
+		members := newMembersForTest(2)
+		changes, unchanged, actives, _, _ := obj.getTopologyChanges(members)
+		assert.False(unchanged)
 		expected := &ClusterTopology{TopologyHash: TopologyHash(members), Members: members, Joined: members, Left: empty}
-		a.Equal(expected.TopologyHash, changes.TopologyHash)
+		assert.Equal(expected.TopologyHash, changes.TopologyHash)
 
 		var m1, m2 *MemberSet
 		m1 = NewMemberSet(expected.Members)
 		m2 = NewMemberSet(changes.Members)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 
 		m1 = NewMemberSet(expected.Joined)
 		m2 = NewMemberSet(changes.Joined)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 
 		m1 = NewMemberSet(expected.Left)
 		m2 = NewMemberSet(changes.Left)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
+
+		// current members
+		obj.members = actives
 	})
 
 	t.Run("join", func(t *testing.T) {
-		a := assert.New(t)
-		members := _newTopologyEventForTest(4)
-		changes, _, _, _, _ := obj.getTopologyChanges(members)
-		_sorted(changes)
+		assert := assert.New(t)
+		assert.Equal(2, obj.members.Len())
+		members := newMembersForTest(4)
+		changes, unchanged, actives, _, _ := obj.getTopologyChanges(members)
+		assert.False(unchanged)
+		// _sorted(changes)
 		expected := &ClusterTopology{TopologyHash: TopologyHash(members), Members: members, Joined: members[2:4], Left: empty}
-		a.Equal(expected.TopologyHash, changes.TopologyHash)
+		assert.Equal(expected.TopologyHash, changes.TopologyHash)
 
 		var m1, m2 *MemberSet
 		m1 = NewMemberSet(expected.Members)
 		m2 = NewMemberSet(changes.Members)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 
 		m1 = NewMemberSet(expected.Joined)
 		m2 = NewMemberSet(changes.Joined)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 
 		m1 = NewMemberSet(expected.Left)
 		m2 = NewMemberSet(changes.Left)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
+
+		obj.members = actives
 	})
 
 	t.Run("left", func(t *testing.T) {
-
-		a := assert.New(t)
-		members := _newTopologyEventForTest(4)
+		assert := assert.New(t)
+		assert.Equal(4, obj.members.Len())
+		members := newMembersForTest(4)
 		changes, _, _, _, _ := obj.getTopologyChanges(members[2:4])
-		_sorted(changes)
-		expected := &ClusterTopology{TopologyHash: TopologyHash(members), Members: members[2:4], Joined: empty, Left: members[0:2]}
-		a.Equal(expected.TopologyHash, changes.TopologyHash)
+		expected := &ClusterTopology{TopologyHash: TopologyHash(members[2:4]), Members: members[2:4], Joined: empty, Left: members[0:2]}
+		assert.Equal(expected.TopologyHash, changes.TopologyHash)
 
 		var m1, m2 *MemberSet
 		m1 = NewMemberSet(expected.Members)
 		m2 = NewMemberSet(changes.Members)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 
 		m1 = NewMemberSet(expected.Joined)
 		m2 = NewMemberSet(changes.Joined)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 
 		m1 = NewMemberSet(expected.Left)
 		m2 = NewMemberSet(changes.Left)
-		a.Equal(m1, m2)
+		assert.Equal(m1, m2)
 	})
 }
 
-func _newTopologyEventForTest(membersCount int, kinds ...string) Members {
+func newMembersForTest(count int, kinds ...string) Members {
 	if len(kinds) == 0 {
 		kinds = append(kinds, "kind")
 	}
-
-	members := make(Members, membersCount)
-
-	for i := 0; i < membersCount; i++ {
-		memberID := fmt.Sprintf("memberId-%d", i)
+	members := make(Members, count)
+	for i := 0; i < count; i++ {
 		members[i] = &Member{
-			Id:    memberID,
+			Id:    fmt.Sprintf("memberId-%d", i),
 			Host:  "127.0.0.1",
 			Port:  int32(i),
 			Kinds: kinds,
 		}
 	}
-
 	return members
 }
 
@@ -199,7 +177,7 @@ func TestMemberList_UpdateClusterTopology2(t *testing.T) {
 	}
 
 	a := assert.New(t)
-	members := _newTopologyEventForTest(2)
+	members := newMembersForTest(2)
 	changes, _, _, _, _ := obj.getTopologyChanges(members) //nolint:dogsled
 	_sorted(changes)
 
@@ -229,7 +207,7 @@ func TestMemberList_getPartitionMember(t *testing.T) {
 	obj := NewMemberList(c)
 
 	for _, v := range []int{1, 2, 10, 100, 1000} {
-		members := _newTopologyEventForTest(v)
+		members := newMembersForTest(v)
 		obj.UpdateClusterTopology(members)
 
 		testName := fmt.Sprintf("member*%d", v)
@@ -298,7 +276,7 @@ func TestMemberList_newMemberStrategies(t *testing.T) {
 	obj := NewMemberList(c)
 
 	for _, v := range []int{1, 10, 100, 1000} {
-		members := _newTopologyEventForTest(v, "kind1", "kind2")
+		members := newMembersForTest(v, "kind1", "kind2")
 		obj.UpdateClusterTopology(members)
 		a.Equal(2, len(obj.memberStrategyByKind))
 		a.Contains(obj.memberStrategyByKind, "kind1")
diff --git a/cluster/rendezvous_test.go b/cluster/rendezvous_test.go
index f7690b348..7436af3fd 100644
--- a/cluster/rendezvous_test.go
+++ b/cluster/rendezvous_test.go
@@ -11,7 +11,7 @@ import (
 func Benchmark_Rendezvous_Get(b *testing.B) {
 	SetLogLevel(log.ErrorLevel)
 	for _, v := range []int{1, 2, 3, 5, 10, 100, 1000, 2000} {
-		members := _newTopologyEventForTest(v)
+		members := newMembersForTest(v)
 		ms := newDefaultMemberStrategy(nil, "kind").(*simpleMemberStrategy)
 		for _, member := range members {
 			ms.AddMember(member)