lint: Add regression tests for bounce detection

setup/test/tests/test.email-bounces.php

+<?php
+require_once "class.test.php";
+require_once INCLUDE_DIR."class.filter.php";
+require_once INCLUDE_DIR."class.mailparse.php";
+
+class MailBouncing extends Test {
+    var $name = "Mail header tests";
+
+    function testBounceHeaders() {
+        static $headers = array(
+            'Return-Path: <>',
+            'From: Mail Delivery Subsystem <mailer-daemon@googlemail.com>',
+            'X-Failed-Recipients: xxxxrack@xbsoxxxxxx.com',
+            'Subject: Delivery Status Notification (Failure)',
+            'From: MAILER-DAEMON@mail1.dl.supportsystem.com (Mail Delivery System)',
+            'Subject: Undelivered Mail Returned to Sender',
+            'Content-Type: multipart/report; report-type=delivery-status;
+                boundary="6053C732A.7354145592/mail1.dl.supportsystem.com"',
+        );
+        foreach ($headers as $h)
+            $this->assert(TicketFilter::isBounce($h), $h.": Unidentified bouce");
+    }
+
+    function testAutoReplyHeaders() {
+        static $headers = array(
+            'Auto-Submitted: auto-replied',
+            'Precedence: auto_reply',
+            'X-Precedence: auto_reply',
+            'X-Autorespond: osTicket v1.8.0.2 Released',
+            'Auto-Submitted: auto-generated',
+            'X-Autogenerated: Reply',
+        );
+        foreach ($headers as $h)
+            $this->assert(TicketFilter::isAutoReply($h),
+                $h.": Unidentified auto-reply");
+    }
+}
+
+return 'MailBouncing';
+?>