userfront&backend test coverage 추가

userfront/test/auth_token_store_backend_test.dart

@@ -30,6 +30,54 @@ void main() {
       expect(session.read('baron_auth_provider'), 'ory');
     });
 
+    test('cookie mode는 token을 제거하고 provider를 유지한다', () {
+      final local = _FakeTarget();
+      final session = _FakeTarget();
+      final store = AuthTokenStoreBackend(
+        localTarget: local,
+        sessionTarget: session,
+      );
+
+      store.setToken('jwt-token', provider: 'ory');
+      store.setCookieMode(provider: 'cookie-provider');
+
+      expect(store.getToken(), isNull);
+      expect(store.usesCookie(), isTrue);
+      expect(store.getProvider(), 'cookie-provider');
+      expect(local.read('baron_auth_cookie_mode'), '1');
+      expect(session.read('baron_auth_token'), isNull);
+    });
+
+    test('pending provider는 빈 값이면 제거하고 저장소 오류는 건너뛴다', () {
+      final local = _FakeTarget(throwsOnWrite: true, throwsOnRemove: true);
+      final session = _FakeTarget();
+      final store = AuthTokenStoreBackend(
+        localTarget: local,
+        sessionTarget: session,
+      );
+
+      store.setPendingProvider('ory');
+      expect(store.getPendingProvider(), 'ory');
+      expect(session.read('baron_auth_pending_provider'), 'ory');
+
+      store.setPendingProvider('');
+      expect(store.getPendingProvider(), isNull);
+      expect(session.read('baron_auth_pending_provider'), isNull);
+    });
+
+    test('local/session 저장이 모두 실패해도 memory fallback으로 읽을 수 있다', () {
+      final store = AuthTokenStoreBackend(
+        localTarget: _FakeTarget(throwsOnWrite: true, throwsOnRead: true),
+        sessionTarget: _FakeTarget(throwsOnWrite: true, throwsOnRead: true),
+      );
+
+      store.setToken('memory-token');
+      store.setPendingProvider('memory-provider');
+
+      expect(store.getToken(), 'memory-token');
+      expect(store.getPendingProvider(), 'memory-provider');
+    });
+
     test('clear 호출 시 local/session/memory 모두 정리된다', () {
       final local = _FakeTarget(
         readSeed: {
@@ -67,11 +115,13 @@ class _FakeTarget implements AuthTokenStorageTarget {
   _FakeTarget({
     this.throwsOnRead = false,
     this.throwsOnWrite = false,
+    this.throwsOnRemove = false,
     Map<String, String>? readSeed,
   }) : _data = {...?readSeed};
 
   final bool throwsOnRead;
   final bool throwsOnWrite;
+  final bool throwsOnRemove;
   final Map<String, String> _data;
 
   @override
@@ -84,6 +134,9 @@ class _FakeTarget implements AuthTokenStorageTarget {
 
   @override
   void remove(String key) {
+    if (throwsOnRemove) {
+      throw Exception('remove failed');
+    }
     _data.remove(key);
   }