TF-2678 Implement server settings data source

lib/features/server_settings/data/datasource_impl/remote_server_settings_data_source_impl.dart

@@ -0,0 +1,28 @@
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:server_settings/server_settings/tmail_server_settings.dart';
+import 'package:tmail_ui_user/features/server_settings/data/datasource/server_settings_data_source.dart';
+import 'package:tmail_ui_user/features/server_settings/data/network/server_settings_api.dart';
+import 'package:tmail_ui_user/main/exceptions/exception_thrower.dart';
+
+class RemoteServerSettingsDataSourceImpl implements ServerSettingsDataSource {
+  final ServerSettingsAPI _serverSettingsAPI;
+  final ExceptionThrower _exceptionThrower;
+
+  RemoteServerSettingsDataSourceImpl(
+    this._serverSettingsAPI, 
+    this._exceptionThrower);
+
+  @override
+  Future<TMailServerSettings> getServerSettings(AccountId accountId) {
+    return Future.sync(() async {
+      return await _serverSettingsAPI.getServerSettings(accountId);
+    }).catchError(_exceptionThrower.throwException);
+  }
+
+  @override
+  Future<TMailServerSettings> updateServerSettings(AccountId accountId, TMailServerSettings serverSettings) {
+    return Future.sync(() async {
+      return await _serverSettingsAPI.updateServerSettings(accountId, serverSettings);
+    }).catchError(_exceptionThrower.throwException);
+  }
+}

test/features/server_settings/data/datasource_impl/remote_server_settings_data_source_impl_test.dart

@@ -0,0 +1,83 @@
+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/server_settings_id.dart';
+import 'package:server_settings/server_settings/tmail_server_settings.dart';
+import 'package:tmail_ui_user/features/server_settings/data/datasource_impl/remote_server_settings_data_source_impl.dart';
+import 'package:tmail_ui_user/features/server_settings/data/network/server_settings_api.dart';
+import 'package:tmail_ui_user/features/server_settings/domain/exceptions/server_settings_exception.dart';
+import 'package:tmail_ui_user/main/exceptions/remote_exception_thrower.dart';
+
+import 'remote_server_settings_data_source_impl_test.mocks.dart';
+
+@GenerateNiceMocks([MockSpec<ServerSettingsAPI>()])
+void main() {
+  final serverSettings = TMailServerSettings(
+    id: ServerSettingsId(id: Id('123')),
+    settings: TMailServerSettingOptions(alwaysReadReceipts: true),
+  );
+  final accountId = AccountId(Id('321'));
+  final serverSettingsAPI = MockServerSettingsAPI();
+  final remoteServerSettingsDataSource = RemoteServerSettingsDataSourceImpl(
+    serverSettingsAPI,
+    RemoteExceptionThrower(),
+  );
+
+  group('remote server settings data source', () {
+    group('get server settings', () {
+      test('should return value when ServerSettingsAPI returns value',() async {
+        // arrange
+        when(serverSettingsAPI.getServerSettings(any))
+          .thenAnswer((_) async => serverSettings);
+
+        // act
+        final result = await remoteServerSettingsDataSource
+          .getServerSettings(accountId);
+
+        // assert
+        expect(result, serverSettings);
+      });
+
+      test('should rethrow exception when ServerSettingsAPI throws exception',() async {
+        // arrange
+        when(serverSettingsAPI.getServerSettings(any))
+          .thenThrow(NotFoundServerSettingsException());
+
+        // assert
+        expect(
+          () => remoteServerSettingsDataSource.getServerSettings(accountId),
+          throwsA(const TypeMatcher<NotFoundServerSettingsException>()));
+      });
+    });
+
+    group('update server settings', () {
+      test('should return value when ServerSettingsAPI returns value',() async {
+        // arrange
+        when(serverSettingsAPI.updateServerSettings(any, any))
+          .thenAnswer((_) async => serverSettings);
+
+        // act
+        final result = await remoteServerSettingsDataSource
+          .updateServerSettings(accountId, serverSettings);
+
+        // assert
+        expect(result, serverSettings);
+      });
+
+      test('should rethrow exception when ServerSettingsAPI throws exception',() async {
+        // arrange
+        when(serverSettingsAPI.updateServerSettings(any, any))
+          .thenThrow(CanNotUpdateServerSettingsException());
+
+        // assert
+        expect(
+          () => remoteServerSettingsDataSource.updateServerSettings(
+            accountId, 
+            serverSettings),
+          throwsA(const TypeMatcher<CanNotUpdateServerSettingsException>()));
+      });
+    });
+  });
+}