immich/mobile/test/unit/services/remote_album_service_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:immich_mobile/domain/services/remote_album.service.dart';
import 'package:mocktail/mocktail.dart';

import '../../service.mocks.dart';
import '../mocks.dart';

void main() {
  late RemoteAlbumService sut;
  final mocks = RepositoryMocks();

  setUpAll(() {
    registerFallbackValue(<String>[]);
  });

  setUp(() {
    sut = RemoteAlbumService(mocks.remoteAlbum, mocks.albumApi, MockForegroundUploadService());
  });

  tearDown(() {
    mocks.resetAll();
  });

  group('RemoteAlbumService', () {
    group('removeAssets', () {
      test('persists only the assets the server actually removed, not the whole request', () async {
        const albumId = 'album-1';
        const requested = ['asset-1', 'asset-2', 'asset-3'];
        const removed = ['asset-1', 'asset-3'];

        // The server rejected 'asset-2'
        when(
          () => mocks.albumApi.removeAssets(albumId, requested),
        ).thenAnswer((_) async => (removed: removed, failed: ['asset-2']));
        when(() => mocks.remoteAlbum.removeAssets(albumId, any())).thenAnswer((_) async {});

        final count = await sut.removeAssets(albumId: albumId, assetIds: requested);

        final persisted =
            verify(() => mocks.remoteAlbum.removeAssets(albumId, captureAny())).captured.single as List<String>;
        expect(persisted, removed);
        expect(persisted, isNot(contains('asset-2')));

        expect(count, removed.length);
      });
    });
  });
}