TF-4367 Add E2E test for test case forward email is forwarded when change language on mobile

integration_test/mixin/generate_email_scenario_mixin.dart

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+import 'package:flutter_test/flutter_test.dart';
+
+import '../base/base_scenario.dart';
+import '../models/provisioning_email.dart';
+import '../robots/email_robot.dart';
+import 'scenario_utils_mixin.dart';
+
+mixin GenerateEmailScenarioMixin on BaseScenario, ScenarioUtilsMixin {
+  Future<void> generateEmailWithSubject({
+    required String emailUser,
+    required String subject,
+  }) async {
+    await provisionEmail(
+      [
+        ProvisioningEmail(
+          toEmail: emailUser,
+          subject: subject,
+          content: subject,
+        ),
+      ],
+      requestReadReceipt: false,
+    );
+    await $.pumpAndTrySettle();
+  }
+
+  Future<void> closeEmailDetailedView({required EmailRobot emailRobot}) async {
+    await emailRobot.onTapBackButton();
+  }
+}

integration_test/mixin/screen_scenario_mixin.dart

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+import 'package:core/presentation/resources/image_paths.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../robots/composer_robot.dart';
+import '../robots/email_robot.dart';
+
+mixin ScreenScenarioMixin {
+  Future<void> closeEmailDetailedView({required EmailRobot emailRobot}) async {
+    await emailRobot.onTapBackButton();
+  }
+
+  Future<void> closeComposer({
+    required ComposerRobot composerRobot,
+    required ImagePaths imagePaths,
+  }) async {
+    await composerRobot.tapCloseComposer(imagePaths);
+    await composerRobot.tapDiscardChanges();
+  }
+}

integration_test/mixin/setting_scenario_mixin.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
+
+import '../base/base_scenario.dart';
+import '../robots/language_robot.dart';
+import '../robots/mailbox_menu_robot.dart';
+import '../robots/setting_robot.dart';
+import '../robots/thread_robot.dart';
+
+mixin SettingScenarioMixin on BaseScenario {
+  Future<void> goToSettingToChangeLanguage({
+    required ThreadRobot threadRobot,
+    required SettingRobot settingRobot,
+    required MailboxMenuRobot mailboxMenuRobot,
+    required LanguageRobot languageRobot,
+    required AppLocalizations appLocalizations,
+    required Locale locale,
+  }) async {
+    await threadRobot.openMailbox();
+    await mailboxMenuRobot.openSetting();
+    await _expectLanguageMenuItemVisible();
+
+    await settingRobot.openLanguageMenuItem();
+    await languageRobot.openLanguageContextMenu();
+    await languageRobot.selectLanguage(locale, appLocalizations);
+    await _expectLanguageViewByLocaleTitleVisible(appLocalizations);
+
+    await settingRobot.backToSettingsFromFirstLevel();
+    await settingRobot.closeSettings();
+  }
+
+  Future<void> _expectLanguageMenuItemVisible() async {
+    await $(#setting_language_region).scrollTo(
+      scrollDirection: AxisDirection.down,
+    );
+    await expectViewVisible($(#setting_language_region));
+  }
+
+  Future<void> _expectLanguageViewByLocaleTitleVisible(
+    AppLocalizations appLocalizations,
+  ) async {
+    await expectViewVisible($(find.text(appLocalizations.language)));
+  }
+}