diff --git a/common/domain/replication_queue_test.go b/common/domain/replication_queue_test.go
index 7dd40689745..d2a662bfff4 100644
--- a/common/domain/replication_queue_test.go
+++ b/common/domain/replication_queue_test.go
@@ -397,3 +397,137 @@ func TestGetDLQAckLevel(t *testing.T) {
 		})
 	}
 }
+
+func TestRangeDeleteMessagesFromDLQ(t *testing.T) {
+	tests := []struct {
+		name      string
+		firstID   int64
+		lastID    int64
+		wantErr   bool
+		setupMock func(q *persistence.MockQueueManager)
+	}{
+		{
+			name:    "successful range delete from DLQ",
+			firstID: 10,
+			lastID:  20,
+			wantErr: false,
+			setupMock: func(q *persistence.MockQueueManager) {
+				q.EXPECT().RangeDeleteMessagesFromDLQ(gomock.Any(), gomock.Eq(int64(10)), gomock.Eq(int64(20))).Return(nil)
+			},
+		},
+		{
+			name:    "range delete from DLQ fails",
+			firstID: 10,
+			lastID:  20,
+			wantErr: true,
+			setupMock: func(q *persistence.MockQueueManager) {
+				q.EXPECT().RangeDeleteMessagesFromDLQ(gomock.Any(), gomock.Eq(int64(10)), gomock.Eq(int64(20))).Return(errors.New("range delete error"))
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			mockQueue := persistence.NewMockQueueManager(ctrl)
+			rq := NewReplicationQueue(mockQueue, "testCluster", nil, nil)
+			tt.setupMock(mockQueue)
+			err := rq.RangeDeleteMessagesFromDLQ(context.Background(), tt.firstID, tt.lastID)
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestDeleteMessageFromDLQ(t *testing.T) {
+	tests := []struct {
+		name      string
+		messageID int64
+		wantErr   bool
+		setupMock func(q *persistence.MockQueueManager)
+	}{
+		{
+			name:      "successful delete from DLQ",
+			messageID: 15,
+			wantErr:   false,
+			setupMock: func(q *persistence.MockQueueManager) {
+				q.EXPECT().DeleteMessageFromDLQ(gomock.Any(), gomock.Eq(int64(15))).Return(nil)
+			},
+		},
+		{
+			name:      "delete from DLQ fails",
+			messageID: 15,
+			wantErr:   true,
+			setupMock: func(q *persistence.MockQueueManager) {
+				q.EXPECT().DeleteMessageFromDLQ(gomock.Any(), gomock.Eq(int64(15))).Return(errors.New("delete error"))
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			mockQueue := persistence.NewMockQueueManager(ctrl)
+			rq := NewReplicationQueue(mockQueue, "testCluster", nil, nil)
+			tt.setupMock(mockQueue)
+			err := rq.DeleteMessageFromDLQ(context.Background(), tt.messageID)
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestGetDLQSize(t *testing.T) {
+	tests := []struct {
+		name      string
+		wantSize  int64
+		wantErr   bool
+		setupMock func(m *persistence.MockQueueManager)
+	}{
+		{
+			name:     "returns correct size for non-empty DLQ",
+			wantSize: 10,
+			wantErr:  false,
+			setupMock: func(m *persistence.MockQueueManager) {
+				m.EXPECT().GetDLQSize(gomock.Any()).Return(int64(10), nil)
+			},
+		},
+		{
+			name:     "returns zero for empty DLQ",
+			wantSize: 0,
+			wantErr:  false,
+			setupMock: func(m *persistence.MockQueueManager) {
+				m.EXPECT().GetDLQSize(gomock.Any()).Return(int64(0), nil)
+			},
+		},
+		{
+			name:    "propagates error from underlying queue",
+			wantErr: true,
+			setupMock: func(m *persistence.MockQueueManager) {
+				m.EXPECT().GetDLQSize(gomock.Any()).Return(int64(0), errors.New("database error"))
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			mockQueueManager := persistence.NewMockQueueManager(ctrl)
+			tt.setupMock(mockQueueManager)
+			q := &replicationQueueImpl{queue: mockQueueManager}
+			size, err := q.GetDLQSize(context.Background())
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, tt.wantSize, size)
+			}
+		})
+	}
+}