TF-3563 Add integration test for case download attachment in EmailView

Signed-off-by: dab246 <tdvu@linagora.com>

integration_test/robots/email_robot.dart

@@ -1,4 +1,6 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/features/email/presentation/widgets/attachment_item_widget.dart';
 import 'package:tmail_ui_user/features/email/presentation/widgets/email_view_back_button.dart';
 import 'package:tmail_ui_user/features/email/presentation/widgets/information_sender_and_receiver_builder.dart';
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
@@ -77,4 +79,8 @@ class EmailRobot extends CoreRobot {
   Future<void> longPressSenderEmailAddress(String email) async {
     await $(InformationSenderAndReceiverBuilder).$(email).longPress();
   }
+
+  Future<void> onTapAttachmentItem() async {
+    await $(AttachmentItemWidget).$(InkWell).tap();
+  }
 }

integration_test/scenarios/email_detailed/export_attachment_scenario.dart

@@ -0,0 +1,61 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/features/email/presentation/email_view.dart';
+import 'package:tmail_ui_user/features/email/presentation/widgets/attachment_item_widget.dart';
+import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
+
+import '../../base/base_test_scenario.dart';
+import '../../models/provisioning_email.dart';
+import '../../robots/email_robot.dart';
+import '../../robots/thread_robot.dart';
+
+class ExportAttachmentScenario extends BaseTestScenario {
+
+  const ExportAttachmentScenario(super.$);
+
+  @override
+  Future<void> runTestLogic() async {
+    const subject = 'export attachment';
+    const attachmentContent = 'attachment content';
+    const emailUser = String.fromEnvironment('BASIC_AUTH_EMAIL');
+    final threadRobot = ThreadRobot($);
+    final emailRobot = EmailRobot($);
+    final appLocalizations = AppLocalizations();
+
+    final attachmentFile = await preparingTxtFile(attachmentContent);
+    await provisionEmail(
+      [
+        ProvisioningEmail(
+          toEmail: emailUser,
+          subject: subject,
+          content: subject,
+          attachmentPaths: [attachmentFile.path],
+        ),
+      ],
+      requestReadReceipt: false,
+    );
+    await $.pumpAndSettle();
+
+    await threadRobot.openEmailWithSubject(subject);
+    await $.pumpAndSettle();
+    _expectAttachmentVisible();
+
+    await emailRobot.onTapAttachmentItem();
+    await $.pumpAndSettle();
+
+    await $.native.pressBack();
+    _expectEmailViewVisible();
+    _expectExportDialogLoadingInvisible(appLocalizations);
+  }
+
+  void _expectAttachmentVisible() {
+    expect($(AttachmentItemWidget), findsOneWidget);
+  }
+
+  void _expectEmailViewVisible() {
+    expect($(EmailView).visible, isTrue);
+  }
+
+  void _expectExportDialogLoadingInvisible(AppLocalizations appLocalizations) {
+    expect($(appLocalizations.preparing_to_export).visible, isFalse);
+  }
+}

integration_test/tests/email_detailed/export_attachment_test.dart

@@ -0,0 +1,9 @@
+import '../../base/test_base.dart';
+import '../../scenarios/email_detailed/export_attachment_scenario.dart';
+
+void main() {
+  TestBase().runPatrolTest(
+    description: 'Should auto preview attachment when export attachment successfully',
+    scenarioBuilder: ($) => ExportAttachmentScenario($),
+  );
+}