diff --git a/backend/internal/service/payment_order_result_test.go b/backend/internal/service/payment_order_result_test.go
index e77fbce482..ce405e0a23 100644
--- a/backend/internal/service/payment_order_result_test.go
+++ b/backend/internal/service/payment_order_result_test.go
@@ -9,6 +9,7 @@ import (
 	dbent "github.com/Wei-Shaw/sub2api/ent"
 	"github.com/Wei-Shaw/sub2api/internal/payment"
 	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+	"github.com/stretchr/testify/require"
 )
 
 func TestShouldUseAlipayMobilePrecreate(t *testing.T) {
@@ -389,15 +390,11 @@ func TestMaybeBuildWeChatOAuthRequiredResponse(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-	if resp == nil {
-		t.Fatal("expected oauth_required response, got nil")
-	}
+	require.NotNil(t, resp)
 	if resp.ResultType != payment.CreatePaymentResultOAuthRequired {
 		t.Fatalf("result type = %q, want %q", resp.ResultType, payment.CreatePaymentResultOAuthRequired)
 	}
-	if resp.OAuth == nil {
-		t.Fatal("expected oauth payload, got nil")
-	}
+	require.NotNil(t, resp.OAuth)
 	if resp.OAuth.AppID != "wx123456" {
 		t.Fatalf("appid = %q, want %q", resp.OAuth.AppID, "wx123456")
 	}
@@ -503,9 +500,7 @@ func TestMaybeBuildWeChatOAuthRequiredResponseFallsBackToConfiguredLegacySigning
 	if err != nil {
 		t.Fatalf("expected nil error, got %v", err)
 	}
-	if resp == nil {
-		t.Fatal("expected oauth-required response, got nil")
-	}
+	require.NotNil(t, resp)
 	if resp.ResultType != payment.CreatePaymentResultOAuthRequired {
 		t.Fatalf("result type = %q, want %q", resp.ResultType, payment.CreatePaymentResultOAuthRequired)
 	}
diff --git a/backend/internal/service/ratelimit_service_anthropic_test.go b/backend/internal/service/ratelimit_service_anthropic_test.go
index 0e75b4f914..c02ad00e1f 100644
--- a/backend/internal/service/ratelimit_service_anthropic_test.go
+++ b/backend/internal/service/ratelimit_service_anthropic_test.go
@@ -5,6 +5,8 @@ import (
 	"strconv"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/require"
 )
 
 func TestCalculateAnthropic429ResetTime_Only5hExceeded(t *testing.T) {
@@ -193,9 +195,7 @@ func TestSelectAnthropicFableWindowLimit_RejectedStatus(t *testing.T) {
 	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", strconv.FormatInt(reset.Unix(), 10))
 
 	limit := selectAnthropicFableWindowLimit(headers, now)
-	if limit == nil {
-		t.Fatal("expected non-nil limit")
-	}
+	require.NotNil(t, limit)
 	if !limit.resetAt.Equal(reset) {
 		t.Errorf("expected resetAt=%v, got %v", reset, limit.resetAt)
 	}
@@ -214,9 +214,7 @@ func TestSelectAnthropicFableWindowLimit_UtilizationOnly(t *testing.T) {
 	headers.Set("anthropic-ratelimit-unified-7d_oi-reset", strconv.FormatInt(reset.Unix(), 10))
 
 	limit := selectAnthropicFableWindowLimit(headers, now)
-	if limit == nil {
-		t.Fatal("expected non-nil limit")
-	}
+	require.NotNil(t, limit)
 	if !limit.resetAt.Equal(reset) {
 		t.Errorf("expected resetAt=%v, got %v", reset, limit.resetAt)
 	}