TF-3236 Add integration test to search snippet

integration_test/robots/search_robot.dart

@@ -1,5 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:core/presentation/views/text/text_field_builder.dart';
+import 'package:tmail_ui_user/features/search/email/presentation/search_email_view.dart';
+import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
 
 import '../base/core_robot.dart';
 
@@ -27,4 +30,13 @@ class SearchRobot extends CoreRobot {
     await $(find.text(sortOrderName)).tap();
     await $.pump(const Duration(seconds: 2));
   }
+
+  Future<void> enterKeyword(String keyword) async {
+    await $(SearchEmailView).$(TextFieldBuilder).enterText(keyword);
+  }
+  
+  Future<void> tapOnShowAllResultsText() async {
+    await $.waitUntilVisible($(AppLocalizations().showingResultsFor));
+    await $(AppLocalizations().showingResultsFor).tap();
+  }
 }

integration_test/robots/thread_robot.dart

@@ -1,6 +1,7 @@
 import 'package:core/presentation/views/search/search_bar_view.dart';
 import 'package:flutter/material.dart';
 import 'package:tmail_ui_user/features/base/widget/compose_floating_button.dart';
+import 'package:tmail_ui_user/features/thread/presentation/thread_view.dart';
 
 import '../base/core_robot.dart';
 
@@ -14,4 +15,8 @@ class ThreadRobot extends CoreRobot {
   Future<void> openSearchView() async {
     await $(SearchBarView).$(InkWell).tap();
   }
+
+  Future<void> tapOnSearchField() async {
+    await $(ThreadView).$(SearchBarView).tap();
+  }
 }