refactor(msg_gateway): restructure and rename message_gateway aligned with custom_example

backend/plugins/domain/msg_gateway/msg_gateway_test.go

@@ -0,0 +1,51 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package msg_gateway_test
+
+import (
+	"Wavelet/pkg/testhelper"
+	"Wavelet/plugins/domain/msg_gateway"
+	"context"
+	"testing"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type mockDBService struct {
+	db *gorm.DB
+}
+
+func (m *mockDBService) GORM() *gorm.DB {
+	return m.db
+}
+
+func (m *mockDBService) DB(ctx context.Context) *gorm.DB {
+	return m.db.WithContext(ctx)
+}
+
+func (m *mockDBService) Named(_ string) *gorm.DB {
+	return m.db
+}
+
+func TestUpsertPairingCode_ReusesUnexpired(t *testing.T) {
+	testDB, _, cleanup := testhelper.SetupTestEnvironment(t)
+	msg_gateway.SetDBServiceForTest(&mockDBService{db: testDB})
+	defer func() {
+		msg_gateway.SetDBServiceForTest(nil)
+		cleanup()
+	}()
+	ctx := context.Background()
+	first, err := msg_gateway.UpsertPairingCode(ctx, 1, "tg-1", "ABCD1234", time.Now().Add(15*time.Minute))
+	if err != nil {
+		t.Fatal(err)
+	}
+	second, err := msg_gateway.UpsertPairingCode(ctx, 1, "tg-1", "ZZZZ9999", time.Now().Add(15*time.Minute))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if first.Code != second.Code || first.Code != "ABCD1234" {
+		t.Fatalf("reuse failed: %+v %+v", first, second)
+	}
+}