테넌트 접근 제한 테스트 추가

userfront/test/consent_error_routing_test.dart

@@ -0,0 +1,23 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:userfront/core/services/auth_proxy_service.dart';
+import 'package:userfront/features/auth/domain/consent_error_routing.dart';
+
+void main() {
+  test('tenant_not_allowed consent error routes to dedicated error screen', () {
+    const error = AuthProxyException(
+      errorCode: 'tenant_not_allowed',
+      message: '허용되지 않은 테넌트입니다.',
+    );
+
+    expect(shouldRouteConsentErrorToErrorScreen(error), isTrue);
+  });
+
+  test('generic consent error stays on consent screen', () {
+    const error = AuthProxyException(
+      errorCode: 'forbidden',
+      message: '동의 정보를 가져오지 못했습니다.',
+    );
+
+    expect(shouldRouteConsentErrorToErrorScreen(error), isFalse);
+  });
+}