TF-3611 E2E Spam mailbox empty and recover

integration_test/robots/thread_robot.dart

@@ -86,4 +86,12 @@ class ThreadRobot extends CoreRobot {
   Future<void> confirmEmptyTrash() async {
     await $(AppLocalizations().delete_all).tap();
   }
+
+  Future<void> tapEmptySpamBanner() async {
+    await $(' ${AppLocalizations().deleteAllSpamEmailsNow}').tap();
+  }
+
+  Future<void> confirmEmptySpam() async {
+    await $(AppLocalizations().delete_all).tap();
+  }
 }