TF-2681 Create get always read receipt setting interactor

lib/features/server_settings/domain/state/get_always_read_receipt_setting_state.dart

@@ -0,0 +1,18 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+class GettingAlwaysReadReceiptSetting extends LoadingState {}
+
+class GetAlwaysReadReceiptSettingSuccess extends UIState {
+  final bool alwaysReadReceiptEnabled;
+
+  GetAlwaysReadReceiptSettingSuccess({required this.alwaysReadReceiptEnabled});
+
+  @override
+  List<Object?> get props => [alwaysReadReceiptEnabled];
+}
+
+class GetAlwaysReadReceiptSettingFailure extends FeatureFailure {
+  GetAlwaysReadReceiptSettingFailure(dynamic exception) 
+    : super(exception: exception);
+}

lib/features/server_settings/domain/usecases/get_always_read_receipt_setting_interactor.dart

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+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/repository/server_settings_repository.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/state/get_always_read_receipt_setting_state.dart';
+
+class GetAlwaysReadReceiptSettingInteractor {
+  final ServerSettingsRepository _serverSettingsRepository;
+
+  GetAlwaysReadReceiptSettingInteractor(this._serverSettingsRepository);
+
+  Stream<Either<Failure, Success>> execute(AccountId accountId) async* {
+    try {
+      yield Right(GettingAlwaysReadReceiptSetting());
+      final result = await _serverSettingsRepository.getServerSettings(accountId);
+      yield Right(GetAlwaysReadReceiptSettingSuccess(
+        alwaysReadReceiptEnabled: result.settings?.alwaysReadReceipts ?? true));
+    } catch (e) {
+      yield Left(GetAlwaysReadReceiptSettingFailure(e));
+    }
+  }
+}

test/features/server_settings/domain/usecases/get_always_read_receipt_setting_interactor_test.dart

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+import 'package:dartz/dartz.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:server_settings/server_settings/tmail_server_settings.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/exceptions/server_settings_exception.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/repository/server_settings_repository.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/state/get_always_read_receipt_setting_state.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/usecases/get_always_read_receipt_setting_interactor.dart';
+
+import 'get_always_read_receipt_setting_interactor_test.mocks.dart';
+
+@GenerateNiceMocks([MockSpec<ServerSettingsRepository>()])
+void main() {
+  final accountId = AccountId(Id('123'));
+  final serverSettingsRepository = MockServerSettingsRepository();
+  final getAlwaysReadReceiptSettingInteractor = 
+    GetAlwaysReadReceiptSettingInteractor(serverSettingsRepository);
+
+  group('get always read receipt setting interactor', () {
+    test('should return right with value returned from repository', () {
+      // arrange
+      when(serverSettingsRepository.getServerSettings(any))
+        .thenAnswer((_) async => TMailServerSettings(
+          settings: TMailServerSettingOptions(
+            alwaysReadReceipts: false)));
+      
+      // assert
+      expect(
+        getAlwaysReadReceiptSettingInteractor.execute(accountId),
+        emitsInOrder([
+          Right(GettingAlwaysReadReceiptSetting()),
+          Right(GetAlwaysReadReceiptSettingSuccess(alwaysReadReceiptEnabled: false)),
+        ])
+      );
+    });
+
+    test('should return left with exception returned from repository', () {
+      // arrange  
+      final exception = NotFoundServerSettingsException();
+      when(serverSettingsRepository.getServerSettings(any)).thenThrow(exception);
+      
+      // assert
+      expect(
+        getAlwaysReadReceiptSettingInteractor.execute(accountId),
+        emitsInOrder([
+          Right(GettingAlwaysReadReceiptSetting()),
+          Left(GetAlwaysReadReceiptSettingFailure(exception)),
+        ])
+      );
+    });
+  });
+}