diff --git a/engine/actions_test.go b/engine/actions_test.go
index ce52b88ad..bb78df4ae 100644
--- a/engine/actions_test.go
+++ b/engine/actions_test.go
@@ -4868,3 +4868,35 @@ func TestActionsAlterAndDisconnectSessions(t *testing.T) {
 		})
 	}
 }
+
+func TestActionsStringMethod(t *testing.T) {
+	cdrProvider := &cdrLogProvider{}
+	expectedJSON := "{}"
+	jsonStr := cdrProvider.String()
+	if jsonStr != expectedJSON {
+		t.Errorf("String() method result does not match expected JSON. Got: %s, Expected: %s", jsonStr, expectedJSON)
+	}
+}
+
+func TestActionsClone(t *testing.T) {
+	actions := Actions{}
+	cloned, err := actions.Clone()
+	if err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+	if len(cloned.(Actions)) != len(actions) {
+		t.Errorf("Expected cloned Actions length %d, got %d", len(actions), len(cloned.(Actions)))
+	}
+	for i := range actions {
+		if !reflect.DeepEqual(actions[i], cloned.(Actions)[i]) {
+			t.Errorf("Expected cloned Action[%d] to match original, got %+v", i, cloned.(Actions)[i])
+		}
+	}
+	cloned, err = (Actions)(nil).Clone()
+	if err != nil {
+		t.Errorf("Expected no error when apl is nil, got %v", err)
+	}
+	if cloned != nil {
+		t.Errorf("Expected cloned result to be nil when apl is nil, got %+v", cloned)
+	}
+}
diff --git a/engine/balances_test.go b/engine/balances_test.go
index ed653e965..6cd3339d0 100644
--- a/engine/balances_test.go
+++ b/engine/balances_test.go
@@ -20,6 +20,7 @@ package engine
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"log"
 	"os"
 	"strings"
@@ -884,3 +885,81 @@ func TestBalancesFieldAsInterfaceIndexPath(t *testing.T) {
 	})
 
 }
+
+func TestBalanceSummaryFieldAsInterfaceUnsupportedField(t *testing.T) {
+	balanceSummary := &BalanceSummary{}
+	fldPath := []string{"unsupportedField"}
+	expectedError := fmt.Sprintf("unsupported field prefix: <%s>", fldPath[0])
+	_, err := balanceSummary.FieldAsInterface(fldPath)
+	if err == nil {
+		t.Fatalf("Expected an error but got nil")
+	}
+	if err.Error() != expectedError {
+		t.Errorf("Expected error: %s, but got: %s", expectedError, err.Error())
+	}
+}
+
+func TestBalancesSummaryFieldAsInterface(t *testing.T) {
+	var balanceSummary *BalanceSummary
+	fldPath := []string{"Filed"}
+	_, err := balanceSummary.FieldAsInterface(fldPath)
+	if err != utils.ErrNotFound {
+		t.Fatalf("Expected utils.ErrNotFound but got: %v", err)
+	}
+	balanceSummary = &BalanceSummary{}
+	fldPath = []string{}
+	_, err = balanceSummary.FieldAsInterface(fldPath)
+	if err != utils.ErrNotFound {
+		t.Fatalf("Expected utils.ErrNotFound but got: %v", err)
+	}
+	fldPath = []string{"unsupportedField"}
+	expectedError := fmt.Sprintf("unsupported field prefix: <%s>", fldPath[0])
+	_, err = balanceSummary.FieldAsInterface(fldPath)
+	if err == nil {
+		t.Fatalf("Expected an error but got nil")
+	}
+	if err.Error() != expectedError {
+		t.Errorf("Expected error: %s, but got: %s", expectedError, err.Error())
+	}
+}
+
+func TestBalancesHardMatchFilterNilFilter(t *testing.T) {
+	balance := &Balance{}
+	var balanceFilter *BalanceFilter = nil
+	result := balance.HardMatchFilter(balanceFilter, false)
+	if result != true {
+		t.Errorf("Expected true when balanceFilter is nil, but got %v", result)
+	}
+}
+
+func TestBalancesHardMatchFilter(t *testing.T) {
+	t.Run("NilFilter", func(t *testing.T) {
+		balance := &Balance{}
+		var balanceFilter *BalanceFilter = nil
+
+		result := balance.HardMatchFilter(balanceFilter, false)
+		if result != true {
+			t.Errorf("Expected true when balanceFilter is nil, but got %v", result)
+		}
+	})
+	t.Run("UuidMatch", func(t *testing.T) {
+		expectedUuid := "1"
+		balance := &Balance{Uuid: expectedUuid}
+		balanceFilter := &BalanceFilter{Uuid: &expectedUuid}
+
+		result := balance.HardMatchFilter(balanceFilter, false)
+		if result != true {
+			t.Errorf("Expected true when Uuid matches, but got %v", result)
+		}
+	})
+	t.Run("UuidNoMatch", func(t *testing.T) {
+		balance := &Balance{Uuid: "1"}
+		nonMatchingUuid := "2"
+		balanceFilter := &BalanceFilter{Uuid: &nonMatchingUuid}
+
+		result := balance.HardMatchFilter(balanceFilter, false)
+		if result != false {
+			t.Errorf("Expected false when Uuid doesn't match, but got %v", result)
+		}
+	})
+}
diff --git a/engine/responder_test.go b/engine/responder_test.go
index f6b5b4b7f..a13d99d33 100644
--- a/engine/responder_test.go
+++ b/engine/responder_test.go
@@ -1430,3 +1430,17 @@ func TestResponderGetCostOnRatingPlans(t *testing.T) {
 		t.Errorf("expected %v, got %v", exp, reply)
 	}
 }
+
+func TestResponderPingResponder(t *testing.T) {
+	responder := &Responder{}
+	ctx := context.Background()
+	var event *utils.CGREvent = nil
+	var reply string
+	err := responder.Ping(ctx, event, &reply)
+	if reply != utils.Pong {
+		t.Errorf("Expected reply to be '%s', got '%s'", utils.Pong, reply)
+	}
+	if err != nil {
+		t.Errorf("Expected error to be nil, got %v", err)
+	}
+}